Segment Routing Commands

This chapter describes the commands used to configure and use Segment Routing.


Note
All commands applicable to the Cisco NCS 5500 Series Router are also supported on the Cisco NCS 540 Series Router that is introduced from Cisco IOS XR Release 6.3.2. References to earlier releases in Command History tables apply to only the Cisco NCS 5500 Series Router.

Note

  • Starting with Cisco IOS XR Release 6.6.25, all commands applicable for the Cisco NCS 5500 Series Router are also supported on the Cisco NCS 560 Series Routers.

  • Starting with Cisco IOS XR Release 6.3.2, all commands applicable for the Cisco NCS 5500 Series Router are also supported on the Cisco NCS 540 Series Router.

  • References to releases before Cisco IOS XR Release 6.3.2 apply to only the Cisco NCS 5500 Series Router.

  • Cisco IOS XR Software Release 7.0.1 specific updates are not applicable for the following variants of Cisco NCS 540 Series Routers:

    • N540-28Z4C-SYS-A

    • N540-28Z4C-SYS-D

    • N540X-16Z4G8Q2C-A

    • N540X-16Z4G8Q2C-D

    • N540X-16Z8Q2C-D

    • N540-12Z20G-SYS-A

    • N540-12Z20G-SYS-D

    • N540X-12Z16G-SYS-A

    • N540X-12Z16G-SYS-D

adjacency-sid

To manually allocate an adjacency segment ID (Adj-SID) on an interface, use the adjacency-sid command in IS-IS interface address family configuration mode.

adjacency-sid { index adj-sid-index | absolute adj-sid-value} [ protected]

no adjacency-sid { index adj-sid-index | absolute adj-sid-value} [ protected]

Syntax Description

index adj-sid-index

Specifies the Adj-SID for each link based on the lower boundary of the SRLB + the index.

absolute adj-sid-value

Specifies the specific Adj-SID for each link within the SRLB.

protected

Specify if the Adj-SID is protected. For each primary path, if the Adj-SID is protected on the primary interface and a backup path is available, a backup path is installed. By default, manual Adj-SIDs are not protected.

Command Default

Adjacency SID is not protected.

Command Modes

IS-IS interface address-family configuration

Command History

Release

Modification

Release 6.3.1

This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

Segment routing must be configured on the ISIS instance before configuring adjacency SID value.

Manually allocated Adj-SIDs are supported on point-to-point (P2P) interfaces.

Task ID

Task ID

Operations

isis

read, write

Examples

This example shows how to configure an Adj-SID. 


RP/0/RSP0/CPU0:router # configure
RP/0/RSP0/CPU0:router(config)# router isis 100
RP/0/RSP0/CPU0:router(config-isis)# interface GigabitEthernet0/0/0/7
RP/0/RSP0/CPU0:router(config-isis-if)# point-to-point
RP/0/RSP0/CPU0:router(config-isis-if)# address-family ipv4 unicast
RP/0/RSP0/CPU0:router(config-isis-if-af)# adjacency-sid index 10

Related Commands

Command

Description

segment-routing local-block

Configures the segment routing local block (SRLB).

affinity (flexible algorithm)

To configure flexible algorithm definition to include or exclude links with a particular affinity, use the affinity command in flexible algorithm configuration mode.

router isis instance flex-algo algo affinity [reverse] { include-any | include-all | exclude-any } name1 , name2 , . . .

router ospf process flex-algo algo affinity { include-any | include-all | exclude-any } name1 , name2 , . . .

Syntax Description

instance

Name of the IS-IS routing process. Maximum number of characters is 40.
process

Name that uniquely identifies an OSPF routing process. The process name is any alphanumeric string no longer than 40 characters without spaces.

algo

Flex-algo value. An algorithm is a one octet value. Values from 128 to 255 are reserved for user defined values and are used for Flexible Algorithm representation.

reverse

Specifies the IS-IS Flexible Algorithm link admin group (affinity) constraint to include link colors on links in the reverse direction toward the calculating router.

name1

Name of affinity map.

Command Default

No default behavior or values

Command Modes

Flexible Algorithm configuration

Command History

Release Modification

Releaes 7.9.1

The reverse keyword was added for IS-IS.

Release 7.1.1

The include-any and include-all keywords were added.

Release 6.6.1

This command was introduced.

Examples

The following example shows how to configure IS-IS Flex-Algo:

Router#configure
Router(config)#router isis 1
Router(config-isis)#flex-algo 128
Router(config-isis-flex-algo)#affinity exclude-any red
Router(config-isis-flex-algo)#affinity include-any blue
Router(config-isis-flex-algo)#exit
Router(config-isis)#flex-algo 129
Router(config-isis-flex-algo)#affinity exclude-any green
Router(config-isis-flex-algo)#affinity reverse exclude-any green

affinity flex-algo

To advertise the affinity on an interface, use the affinity flex-algo command in the IS-IS interface configuration mode.

affinity flex-algo { name | [anomaly name] }

Syntax Description

name

Name of affinity map.

anomaly

Advertises flex-algo affinity on performance measurement anomaly.

Command Default

No default behavior or values

Command Modes

IS-IS interface configuration

Command History

Release Modification

Release 7.8.1

This command was modified
Release 6.6.1

This command was introduced.

Examples

The following example shows how ISIS advertises affinity FOO for the adjacency over interface GigabitEthernet0/0/0/0.

RP/0/RSP0/CPU0:router#configure
RP/0/RSP0/CPU0:router(config)#router isis 1
RP/0/RSP0/CPU0:router(config-isis)#interface GigabitEthernet0/0/0/0
RP/0/RSP0/CPU0:router(config-isis-if)#affinity flex-algo FOO
With the IOS XR Release 7.8.1, the new optional keyword anomaly is introduced to the interface submode of affinity flex-algo . This keyword option helps to advertise flex-algo affinity on PM anomaly. The following command is used to associate the affinity with an interface: 
router isis instance interface type interface-path-id affinity flex-algo anomaly name 1, name 2, … 

router ospf process area area interface type interface-path-id affinity flex-algo anomaly name 1, name 2, …

name - name of the affinity-map

You can configure both normal and anomaly values. For the following example, the blue affinity is advertised. However, if a metric is received with the anomaly flag set, it will change to red:

Router# configure
Router(config)# router isis 1
Router(config-isis)#flex-algo 128
Router(config-isis-flex-algo)# interface GigabitEthernet0/0/0/2
Router(config-isis-flex-algo)# affinity flex-algo blue
Router(config-isis-flex-algo)# affinity flex-algo anomaly red

apply-weight ecmp-only bandwidth

To enable Unequal Cost Multipath (UCMP) functionality locally between Equal Cost Multipath (ECMP) paths based on the bandwidth of the local links, use the apply-weight ecmp-only bandwidth command in IS-IS interface address family configuration mode.

apply-weight ecmp-only bandwidth

Syntax Description

bandwidth

Enables UCMP functionality locally between ECMP paths based on the bandwidth of the local links.

Command Default

None.

Command Modes

IS-IS interface address-family configuration

Command History

Release

Modification

Release 6.3.1

This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

Bandwidth-based local UCMP is performed for prefixes, segment routing Adjacency SIDs, and Segment Routing label cross-connects installed by IS-IS, and is supported on any physical or virtual interface that has a valid bandwidth.

Segment routing must be configured on the ISIS instance before configuring bandwidth-based local UCMP.

Task ID

Task ID

Operations

isis

read, write

Examples

This example shows how to configure bandwidth-based local UCMP. 


RP/0/RSP0/CPU0:router # configure
RP/0/RSP0/CPU0:router(config)# router isis 100
RP/0/RSP0/CPU0:router(config-isis)# address-family ipv4 unicast
RP/0/RSP0/CPU0:router(config-isis-af)# apply-weight ecmp-only bandwidth

bgp auto-discovery segment-routing

To configure the BGP Auto-Discovery function for transporting IP VPN multicast traffic, use the bgp auto-discovery segment-routing command in multicast routing VRF address family configuration mode. To remove the configuration, use the no form of the command.

bgp auto-discovery segment-routing

Syntax Description

This command has no keywords or arguments.

Command Default

The BGP Auto-Discovery function is not enabled.

Command Modes

Multicast routing VRF address family configuration

Command History

Release Modification
Release 7.3.1

This command was introduced.

Usage Guidelines

The bgp auto-discovery segment-routing command must be enabled on the PE routers, for default MDT, partitioned MDT and data MDT configuration

Examples

The following example shows how to enable the BGP MVPN Auto-Discovery function:

Router(config)# multicast-routing vrf cust1 
Router(config-mcast-cust1)# address-family ipv4 
Router(config-mcast-cust1-ipv4)# bgp auto-discovery segment-routing 
Router(config-mcast-cust1-ipv4-bgp-ad)# commit

bgp best-path sr-policy

To select the best path, backup, or multipath resolving over nexthop using SR policies, use the bgp best-path sr-policy command in BGP configuration mode. To remove the configuration, use the no form of the command.

bgp best-path sr-policy { force | prefer }

Syntax Description

force

When force mode is enabled, only SR policy paths are considered for best path calculation.
prefer

When prefer mode is enabled, SR policy paths and eBGP non-color paths are eligible for best path calculation.

Command Default

None.

Command Modes

BGP configuration mode

Command History

Release Modification
Release 7.5.2

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Examples

The following example shows how to enable the force mode:

Router(config)#router bgp 100
Router(config-bgp)#bgp router-id 10.1.1.2
Router(config-bgp)#bgp best-path sr-policy force

clear segment-routing local-block discrepancy all

Clears segment routing local block (SRLB) label conflicts.

clear segment-routing local-block discrepancy all

Syntax Description

This command has no keywords or arguments.

Command Default

None

Command Modes

EXEC

Command History

Release

Modification

Release 6.3.1

This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

When you define a new SRLB range, there might be a label conflict (for example, if labels are already allocated, statically or dynamically, in the new SRLB range). In this case, the new SRLB range will be accepted, but not applied (pending). The previous SRLB range (active) will continue to be in use until one of the following occurs:

  • Reload the router to release the currently allocated labels and allocate the new SRLB

  • Use the clear segment-routing local-block discrepancy all command to clear the label conflicts

Task ID

Task ID Operation

Examples

This example shows how to clear SRLB label conflicts. 


RP/0/RSP0/CPU0:router(config)# clear segment-routing local-block discrepancy all

Related Commands

Command

Description

show segment-routing local-block inconsistencies

Displays SRLB label conflicts

segment-routing local-block

Configures the SRLB

data-plane

To enable participation of the Flexible Algorithm with segment routing (SR/SRv6) or IP data-planes, use the data-plane command in the IS-IS Flexible Algorithm configuration mode.

data-plane segment-routing | ip

Syntax Description

segment-routing

Participateswith the segment routing data-plane.
ip

Participates with the IP data-plane.

Command Default

Segment-routing data-plane is enabled.

Command Modes

IS-IS Flexible Algorithm configuration (config-isis-flex-algo)

Command History

Release Modification

IOS XR Release 7.6.1

This command was introduced.

Usage Guidelines

To use this command, you must specify a data-plane.


Note

If you are enabling participation of the IP Flexible Algorithm, data-plane ip must be enabled.
This example shows how to enable IP data-plane to participate with a Flexible Algorithm:
Router(config)#router isis 1
Router(config-isis)#flex-algo 128
Router(config-isis-flex-algo)#data-plane ip

explicit-path

Configures a fixed path through the network.

explicit-path name path_name

Syntax Description

path_name

Specifies a name for an explicit path.

Command Default

None

Command Modes

Global Configuration mode

Command History

Release Modification

Release 6.1.2

This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

Task ID

Task ID Operation

mpls-te

read, write

Examples

This example shows how to specify a path name and enter explicit-path configuration mode:


RP/0/RSP0/CPU0:router(config)# explicit-path name ABCD1_Nodes
RP/0/RSP0/CPU0:router(config-expl-path)#

Related Commands

Command

Description

index

Determines the order of path selection.

distribute link-state (IS-IS)

To configure filters for IS-IS advertisements to BGP-LS, use the distribute link-state command in the IS-IS configuration mode.

distribute link-state [ exclude-external exclude-interarea route-policy name ]

Table 1. Syntax Description:

Syntax

Description
exclude-external

Sets filter to exclude information for external prefixes and specify a route-policy name to filter based on a set of destination prefixes.

exclude-interarea

Sets filter to exclude information for interarea prefixes and specify a route-policy name to filter based on a set of destination prefixes.

route-policyname

Distributes prefixes based on the route policy name set.

Command Default

BGP-LS is disabled by default.

Command Modes

IS-IS Configuration

Command History

Release Modification
Release 7.10.1

New keywords under the command distribute link-state was introduced.

Examples

This example shows how to configure filters for IS-IS advertisements to BGP-LS:


Router#config
Router(config)#router isis 1 
Router(config-isis)#distribute link-state exclude-external
Router(config-isis)#commit

Router#config
Router(config)#router isis 1 
Router(config-isis)#ddistribute link-state exclude-interarea
Router(config-isis)#commit

Router# config
Router(config)# router isis 1 
Router(config-isis)#distribute link-state route-policy isis-rp-1
Router(config-isis)#commit

encapsulation l2-traffic

To set the traffic-class on the IP header of the outgoing packet in an IPv6 network during L2VPN encapsulation, use the encapsulation l2-traffic command in XR Config mode. You must be in hw-module profile segment-routing srv6 mode to configure the encapsulation l2-traffic , for more information see the example.

encapsulation l2-traffic traffic-class [ { traffic-class value | | propagate } ]

Syntax Description

traffic-class

Control traffic-class field of SRv6 IPv6 header for inner l2 traffic.
traffic-class value

This specifies the traffic-class value. Range is from 0x0 to 0xff.

Traffic-class value must be specified as 2 hexadecimals.
propagate

Propagate traffic-class from incoming packet or frame or use qos-group from input policy-map.

Command Default

The default traffic-class value is 0x0.

Command Modes

Global ConfigurationXR Config

Command History

Release Modification
Release 7.7.1

This command was introduced.

Usage Guidelines

  • Reload the line-cards for the following configuration changes.

  • See the feature information table for the default mapping:

    VLAN Class of Service CoS Priority Code Point (PCP) to Traffic Class default mapping

    CoS value TC value

    0

    0

    1

    32

    2

    64

    3

    96

    4

    128

    5

    160

    6

    192

    7

    224

Task ID

Task ID Operation

system

read and write

Examples

The following example shows how to set the l2-traffic:


Router(config)# hw-module profile segment-routing srv6 mode micro-segment format f3216 
Router(config-srv6)# encapsulation 
Router(config-srv6-encap)# l2-traffic 
Router(config-srv6-encap-l2)# traffic-class propagate 
In order to activate/deactivate this srv6 profile, you must manually reload the chassis/all line cards

encapsulation l3-traffic

To set the traffic-class on the IP header of the outgoing packet in an IPv6 network during L3VPN encapsulation, use the encapsulation l3-traffic command in XR Config mode. You must be in hw-module profile segment-routing srv6 mode to configure the encapsulation l3-traffic , for more information see the example.

encapsulation l3-traffic traffic-class [ { traffic-class value | | propagate | | policy-map } ]

Syntax Description

traffic-class

Control traffic-class field of SRv6 IPv6 header for inner l3 traffic.
traffic-class value

This specifies the traffic-class value. Range is from 0x0 to 0xff.

Traffic-class value must be specified as 2 hexadecimals.
propagate

Propagate traffic-class from incoming packet or frame or use qos-group from input policy-map.
policy map

Sets the traffic-class DSCP to qos-group that is selected by the input policy-map.

Command Default

The default traffic-class value is 0x0.

Command Modes

Global ConfigurationXR Config

Command History

Release Modification
Release 7.7.1

This command was introduced.

Usage Guidelines

Reload the line-cards for the following configuration changes.

Task ID

Task ID Operation

system

read and write

Examples

The following example shows how to set the l3-traffic:



Router(config)# hw-module profile segment-routing srv6 mode micro-segment format f3216 
Router(config-srv6)# encapsulation 
Router(config-srv6-encap)# l3-traffic 
Router(config-srv6-encap-l3)# traffic-class policy-map 
In order to activate/deactivate this srv6 profile, you must manually reload the chassis/all line cards

encapsulation-type srv6 relax-sid

To configure the BGP signaling for coexistence of IP routes with or without SRv6 SID over an SRv6-enabled core network use encapsulation-type srv6 relax-sid command in XR Config mode.

encapsulation-type srv6 relax-sid

Syntax Description

encapsulation-type srv6 relax-sid

Enables coexistence of IP routes with or without SRv6 SID.

Syntax Description

This command has no keywords or arguments.

Command Default

The BGP signaling for coexistence of IP routes with or without SRv6 SID over an SRv6-enabled core network is enabled.

Command Modes

Multicast routing VRF address family configuration

Command History

Release Modification
Release 24.3.1

This command was introduced.

Task ID

Task ID Operation

system

read and write

Examples

The following example shows how to enable BGP signaling for coexistence of IP routes with or without SRv6 SID over an SRv6-enabled core network: 


Router(config)# router bgp 2
Router(config-bgp)# neighbor-group srv6-core-relax
Router(config-bgp-nbr)# address-family ipv4 unicast
Router(config-bgp-nbr-af)# encapsulation-type srv6 relax-sid
Router(config-bgp-nbr-af)# exit

evi (bridge-domain)

To associate an EVI instance with an L2VPN bridge domain or enable ELAN bridged unicast traffic over an SRv6 network, use the evi command in the L2VPN bridge domain configuration mode. To disable this feature, use the no form of this command.

evi instance [ segment-routing srv6 ]

Syntax Description

instance

EVI instance that is associated with an L2VPN bridge domain.

segment-routing srv6

(Optional) Specifies that SRv6 is associated with the EVI instance.

Command Default

The EVI instance is not associated with an L2VPN bridge domain.

Command Modes

L2VPN bridge domain configuration.

Command History

Release

Modification

Release 6.2.2

The evi command was introduced for MPLS bridging.

Release 7.5.2

The segment-routing srv6 option was added to the command.

Examples

This example shows how to enable EVPN ELAN bridged unicast traffic over an SRv6 network: 

Router # configure 
Router(config)# l2vpn  
Router(config-l2vpn)# bridge group bg1 
Router(config-l2vpn-bg)# bridge-domain bd1 
Router(config-l2vpn-bg-bd)# interface Hu0/0/0/0.1 
Router(config-l2vpn-bg-bd-ac)# exit  
Router(config-l2vpn-bg-bd)# evi 1 segment-routing srv6 
Router(config-l2vpn-bg-bd-evi-srv6)# commit

fast-reroute per-prefix ti-lfa

To enable Topology Independent Loop Free Alternate (TI-LFA) path for SR-TE policies using the IP Fast Reroute (FRR) mechanism, use the fast-reroute per-prefix ti-lfa command in interface configuration mode. To return to the default behavior, use the no form of this command.

fast-reroute per-prefix [ ti-lfa | tiebreaker { node-protecting | | srlg-disjoint } index priority ]

no fast-reroute

Syntax Description

per-prefix

Specifies an alternate path for every prefix on the specified interface.

ti-lfa

Enables link-protecting TI-LFA.
tiebreaker

Enables fast reroute tie-breaker.
node-protecting

Enables node-protecting TI-LFA.
srlg-disjoint

Enables SRLG-protecting TI-LFA.
index priority

Specifies the priority of the configured tie-breaker. Priority range is from 1 to 255.

Command Default

FRR is disabled.

Link protection is disabled.

Node-protecting TI-LFA is disabled.

SRLG TI-LFA is disabled.

Command Modes

Interface configuration

Command History

Release

Modification

Release 6.1.3

This command was introduced.

Usage Guidelines

The goal of TI-LFA is to reduce the packet loss that results while routers converge after a topology change due to a link or node failure. Rapid failure repair (< 50 msec) is achieved through the use of pre-calculated backup paths that are loop-free and safe to use until the distributed network convergence process is completed. The optimal repair path is the path that the traffic will eventually follow after the IGP has converged.

TI-LFA supports the following protection:

  • Link protection — The link is excluded during the post-convergence backup path calculation.

  • Node protection — The neighbor node is excluded during the post convergence backup path calculation.

  • Shared Risk Link Groups (SRLG) protection — SRLG refer to situations in which links in a network share a common fiber (or a common physical attribute). These links have a shared risk: when one link fails, other links in the group might also fail. TI-LFA SRLG protection attempts to find the post-convergence backup path that excludes the SRLG of the protected link. All local links that share any SRLG with the protecting link are excluded.

If the priority associated with the specified tiebreaker is higher than any other tiebreakers, then the specified post-convergence backup path will be selected, if it is available.

Task ID

Task ID

Operations

isis

ospf

read, write

Examples

The following example shows how to enable FRR on an interface: 


RP/0/RSP0/CPU0:R1(config)# router isis 1
RP/0/RSP0/CPU0:R1(config-isis)# interface TenGigE0/0/0/2/1
RP/0/RSP0/CPU0:R1(config-isis-if)# point-to-point
RP/0/RSP0/CPU0:R1(config-isis-if)# address-family ipv4 unicast
RP/0/RSP0/CPU0:R1(config-isis-if)# fast-reroute per-prefix
RP/0/RSP0/CPU0:R1(config-isis-if)# fast-reroute per-prefix ti-lfa
RP/0/RSP0/CPU0:R1(config-isis-if)# exit

The following example shows how to configure the SRLG-disjoint tiebreaker priority on an interface: 


RP/0/RSP0/CPU0:R1(config)# router isis 1
RP/0/RSP0/CPU0:R1(config-isis)# interface TenGigE0/0/0/2/1
RP/0/RSP0/CPU0:R1(config-isis-if)# point-to-point
RP/0/RSP0/CPU0:R1(config-isis-if)# address-family ipv4 unicast
RP/0/RSP0/CPU0:R1(config-isis-if)# fast-reroute per-prefix
RP/0/RSP0/CPU0:R1(config-isis-if)# fast-reroute per-prefix ti-lfa
RP/0/RSP0/CPU0:R1(config-isis-if)# fast-reroute per-prefix tiebreaker srlg-disjoint index 100
RP/0/RSP0/CPU0:R1(config-isis-if)# exit

generic-metric flex-algo

To configure an application-specific user-defined generic metric for IS-IS interfaces, use the generic-metric flex-algo command in the IS-IS interface address-family submode.

generic-metric flex-algo type type value

Syntax Description

type <type>

Specify the generic metric type. The range is 128–255.
<value>

Specify the flex-algo generic metric value. The range is 1–16777214.

Command Default

By default, the generic metric is not used.

Command Modes

IS-IS interface address-family submode.

Command History

Release Modification
Release 24.2.1

This command was introduced.

Usage Guidelines

None.

Task ID

Task ID

Operations

isis

read, write

Examples

The following example shows how to configure a user-defined application-specific generic metric for an interface:

Router(config)#router isis 1
Router(config-isis)#interface GigabitEthernet 0/2/0/7
Router(config-isis-if)#address-family ipv4 unicast 
Router(config-isis-if-af)#generic-metric flex-algo type 128 100
Router(config-isis-if-af)#commit

hw-module profile segment-routing srv6 mode

To enable Segment Routing over IPv6, use the hw-module profile segment-routing srv6 command in XR Config mode.

hw-module profile segment-routing srv6 mode { base | micro-segment format 3216 [path-mtu] }

Syntax Description

base

Base/F1 (full-length SIDs).
micro-segment format f3216

Micro-segment format F3216 (represents 32-bit block and 16-bit IDs).

base-and-micro-segment-f3216

Enables migration of existing SRv6 SID format1 to SRv6 Micro-SIDs (f3216) formats.

path-mtu

Enables Path MTU discovery for SRv6 profile.

Command Default

None

Command Modes

Global ConfigurationXR Config

Command History

Release Modification

Release 7.11.1

The path-mtu keyword is introduced.

Release 7.8.1 The option base-and-micro-segment-f3216 is introduced.
Release 7.7.1

Mode keyword is mandatory from release 7.7.1 onwards.

Release 6.6.1

This command was introduced.

Usage Guidelines

You must reload the router for the hw-module profile segment-routing srv6 to be functional.

Use the mandatory keyword mode from Cisco IOS XR Software Release 7.7.1 onwards.

Do not use the keyword mode prior to release 7.7.1.

Starting from Release 7.10.1, the SRv6 mode is automatically set to base-and-micro-segment-f3216 mode (dual mode) even if you configure the base mode. The running configuration would still continue to reflect the user configured mode only.

You can verify the change using the following console log: 
fia_driver[238]: %FABRIC-FIA_DRVR-6-HW_MOD_PROFILE_AUTO_CONVERTED : 
Auto-converting SRv6 hw-module base profile to base-and-micro-segment-f3216 profile

For the path-mtu keyword, use the following guidelines:

  • The SRv6 uSID (F3216) format supports the feature.

  • The SRv6 Full-length SID format does not support Path MTU discovery.

  • You must configure this feature on the ingress Provider Edge (PE) router.

  • SRv6 encapsulation supports the following scenarios:

    • IPv4/IPv6 over SRv6

    • SRv6-TE

    • H insert

    • TI-LFA for Single Carrier and Multi Carrier

  • L2 services over SRv6 (L2VPN) do not support the feature.

Task ID

Task ID Operation

system

read, write

Examples

The following example shows how to enable Segment Routing over IPv6 for base, from release 7.7.1 onwards:

Router(config)# hw-module profile segment-routing srv6 mode base 
Router(config-srv6)# encapsulation 
Router(config-srv6-encap)# l2-traffic 
Router(config-srv6-encap-l2)# traffic-class propagate 
In order to activate/deactivate this srv6 profile, you must manually reload the chassis/all line cards 
Router(config-srv6-encap-l2)#(config-srv6-encap-l2)# commit

The following example shows how to enable Segment Routing over IPv6 for micro-segment format, from release 7.7.1 onwards:

Router(config)# hw-module profile segment-routing srv6 mode micro-segment format f3216 
Router(config-srv6)# encapsulation 
Router(config-srv6-encap)# l3-traffic 
Router(config-srv6-encap-l3)# traffic-class policy-map 
In order to activate/deactivate this srv6 profile, you must manually reload the chassis/all line cards 
Router(config-srv6-encap-l2)#(config-srv6-encap-l2)# commit

The following example shows how to enable Segment Routing over IPv6, prior to release 7.7.1:

Router(config)# hw-module profile segment-routing srv6  
Router(config-srv6)# encapsulation 
Router(config-srv6-encap)# l2-traffic 
Router(config-srv6-encap-l2)# traffic-class propagate
In order to activate/deactivate this srv6 profile, you must manually reload the chassis/all line cards 
Router(config-srv6-encap-l2)#(config-srv6-encap-l2)# commit

From IOS XR Release 7.8.1, the hw-module profile segment-routing srv6 mode base-and-micro-segment-f3216 command is used for the in-migration state.

This example shows the in-migration state with SRv6 and configure locator:
Router(config)# segment-routing srv6
Router(config-srv6)# locators
Router(config-srv6-locators)# locator myLoc0
Router(config-srv6-locators)# prefix f1bb:bbbb:bb00:0001::/64
Router(config-srv6-locators)# delayed-delete
Router(config-srv6-locators)# locator myuLoc0
Router(config-srv6-locators)# micro-segment behavior unode psp-usd
Router(config-srv6-locators)# prefix fcbb:bb00:0001::/48
This example shows the in-migration state with SRv6 and IS-IS:
Router(config)# router isis 100
Router(config-isis)# address-family ipv6 unicast
Router(config-isis-af)# segment-routing srv6
Router(config-isis-srv6)# locator myLoc0
Router(config-isis-srv6)# locator myuLoc0
This example shows the in-migration state with SRv6 and BGP/EVPN:
Router(config)# router bgp 100
Router(config-bgp)# bgp router-id 10
Router(config-bgp)# segment-routing srv6
Router(config-bgp-srv6)# locator myuLoc0


Router(config)# evpn
Router(config-evpn)# segment-routing srv6
Router(config-evpn-srv6)# locator myuLoc0
This example shows how to enable Path MTU for Segment Routing over IPv6, from release 7.11.1 onwards:
Router(config)#hw-module profile segment-routing srv6 mode micro-segment format f3216 path-mtu 
In order to activate/deactivate this srv6 profile, you must manually reload the chassis/all line cards 
Router(config-srv6)#commit

hw-module profile segment-routing srv6 mode base

To enable the segment routing over IPv6 (SRv6) Full-length SID on the router, use the hw-module profile segment-routing srv6 mode base command in XR Config mode.

hw-module profile segment-routing srv6 mode base

Syntax Description

This command has no keywords or arguments.

Command Default

None

Command Modes

Global ConfigurationXR Config

Command History

Release Modification
Release 7.7.1

This command was introduced.

Usage Guidelines

You must reload the router after enabling this feature.

Task ID

Task ID Operation

system

read, write

Examples

The following example shows how to enable the segment routing over IPv6 (SRv6) Full-length SID on the router.


Router# configure 
Router(config)# hw-module profile segment-routing srv6 mode base

hw-module profile segment routing srv6 mode base-and-micro-segment-f3216

To enable migration of existing SRv6 SID format1 to SRv6 Micro-SIDs (f3216) formats, use the hw-module profile segment routing srv6 mode base-and-microsegment-f3216 command in XR Config mode.

hw-module profile segment-routing srv6 mode base-and-micro-segment-f3216

Syntax Description

This command has no keywords or arguments.

Command Default

None

Command Modes

Global ConfigurationXR Config

Command History

Release Modification
Release 7.8.1

This command was introduced.

Usage Guidelines

  • You must reload the router after enabling the command.

  • From IOS XR Release 7.8.1, the hw-module profile segment-routing srv6 mode base-and-micro-segment-f3216 command is used for the in-migration state.

  • Starting from Release 7.10.1, the SRv6 mode is automatically set to base-and-micro-segment-f3216 mode (dual mode) even if you configure the base mode. The running configuration would still continue to reflect the user configured mode only.

    You can verify the change using the following console log: 
    fia_driver[238]: %FABRIC-FIA_DRVR-6-HW_MOD_PROFILE_AUTO_CONVERTED : 
Auto-converting SRv6 hw-module base profile to base-and-micro-segment-f3216 profile

Task ID

Task ID Operation

system

read, write

Examples

This example shows the in-migration state with SRv6 and configure locator:
Router(config)# segment-routing srv6
Router(config-srv6)# locators
Router(config-srv6-locators)# locator myLoc0
Router(config-srv6-locators)# prefix f1bb:bbbb:bb00:0001::/64
Router(config-srv6-locators)# delayed-delete
Router(config-srv6-locators)# locator myuLoc0
Router(config-srv6-locators)# micro-segment behavior unode psp-usd
Router(config-srv6-locators)# prefix fcbb:bb00:0001::/48
This example shows the in-migration state with SRv6 and IS-IS:
Router(config)# router isis 100
Router(config-isis)# address-family ipv6 unicast
Router(config-isis-af)# segment-routing srv6
Router(config-isis-srv6)# locator myLoc0
Router(config-isis-srv6)# locator myuLoc0
This example shows the in-migration state with SRv6 and BGP/EVPN:
Router(config)# router bgp 100
Router(config-bgp)# bgp router-id 10
Router(config-bgp)# segment-routing srv6
Router(config-bgp-srv6)# locator myuLoc0


Router(config)# evpn
Router(config-evpn)# segment-routing srv6
Router(config-evpn-srv6)# locator myuLoc0

hw-module profile segment routing srv6 mode micro-segment

To use SRv6 Micro-SID (uSID) before configuring SRv6 on the Cisco NCS 5500 Series Routers, enter the hw-module profile segment-routing srv6 mode micro-segment command in XR Config mode.

hw-module profile segment-routing srv6 mode micro-segment format f3216

Syntax Description

micro-segment format f3216

Enables the micro-segment format F3216 (represents 32-bit block and 16-bit IDs) for SRv6 profile.

path-mtu

Enables Path MTU discovery for SRv6 profile.

Command Default

None

Command Modes

Global ConfigurationXR Config

Command History

Release Modification
Release 7.11.1

The path-mtu keyword is introduced.

Release 7.7.1

This command was introduced.

Usage Guidelines

  • You must reload the router after enabling the command.

  • For the path-mtu keyword, use the following guidelines:

    • The SRv6 uSID (F3216) format supports the Path MTU discovery.

    • The SRv6 Full-length SID format does not support Path MTU discovery.

    • You must configure this feature on the ingress Provider Edge (PE) router.

    • SRv6 encapsulation supports the following scenarios:

      • IPv4/IPv6 over SRv6

      • SRv6-TE

      • H insert

      • TI-LFA for Single Carrier and Multi Carrier

    • L2 services over SRv6 (L2VPN) do not support the feature.

Task ID

Task ID Operation

system

read, write

Examples

The following example shows how to enable Segment Routing over IPv6 for micro-segment format.

Router(config)# hw-module profile segment-routing srv6 mode micro-segment format f3216 
Router(config-srv6)# encapsulation 
Router(config-srv6-encap)# l3-traffic 
Router(config-srv6-encap-l3)# traffic-class policy-map 
In order to activate/deactivate this srv6 profile, you must manually reload the chassis/all line cards 
Router(config-srv6-encap-l2)#(config-srv6-encap-l2)# commit
This example shows how to enable Path MTU for Segment Routing over IPv6.
Router(config)#hw-module profile segment-routing srv6 mode micro-segment format f3216 path-mtu 
In order to activate/deactivate this srv6 profile, you must manually reload the chassis/all line cards 
Router(config-srv6)#commit

hw-module profile segment-routing srv6 mode encapsulation traffic-class

To set the traffic-class on the IP header of the outgoing packet in an IPv6 network during L3VPN encapsulation, use the hw-module profile segment-routing srv6 mode encapsulation traffic-class command in XR Config mode.

hw-module profile segment-routing srv6 mode encapsulation traffic-class | [ { encapsulation l2 traffic-class | | | encapsulation l3 traffic-class } ]

Syntax Description

traffic-class

Controls traffic-class field of SRv6 IPv6 header for inner L2 and L3 traffic.
traffic-class value

Specifies the traffic-class value. This value, which is a hexidecimal number, ranges between 0x0 and 0xff .

propagate

Propagates traffic-class from incoming packet or frame or use qos-group from input policy-map for L2 traffic.
policy-map

Sets the topmost 3-bit traffic-class DSCP to qos-group that is selected by the input policy-map for L3 traffic.

policy-map-extend

Sets the traffic-class DSCP marking to 6 bits for SRv6 for both the L2 and L3 traffic.

Command Default

None

Command Modes

Global ConfigurationXR Config

Command History

Release Modification
Release 6.6.1

This command was introduced.
Release 7.7.1

L2 and L3 EVPN QoS support was introduced.
Release 24.2.1

The new parameter, policy-map-extend, was added to 6-bit DSCP traffic-class marking for both the L2 and L3 modes.

Usage Guidelines

The default traffic-class value is 0.

The router must be reloaded for the # hw-module profile segment-routing srv6 mode micro-segment format f3216 encapsulation feature to be functional.

The set qos-group action can be used with the new parameter policy-map-extend in the hw-module profile segment-routing srv6 mode encapsulation traffic class command.

Task ID

Task ID Operation

system

read, write

Examples

This example shows how to set the traffic-class propagate option for L2 mode: 

RP/0/RSP0/CPU0:ios# configure
RP/0/RSP0/CPU0:ios(config)# hw-module profile segment-routing srv6 mode micro-segment format f3216
RP/0/RSP0/CPU0:ios(config-srv6)# encapsulation
RP/0/RSP0/CPU0:ios(config-srv6-encap)# l2-traffic
RP/0/RSP0/CPU0:ios(config-srv6-encap-l2)# traffic-class propagate

This example shows how to set the traffic-class policy-map option for L3 mode. 

RP/0/RSP0/CPU0:ios# configure
RP/0/RSP0/CPU0:ios(config)# hw-module profile segment-routing srv6 mode micro-segment format f3216
RP/0/RSP0/CPU0:ios(config-srv6)# encapsulation
RP/0/RSP0/CPU0:ios(config-srv6-encap)# l3-traffic
RP/0/RSP0/CPU0:ios(config-srv6-encap-l3)# traffic-class policy-map

This example shows how to set the traffic-class policy-map-extend option for both the L2 and L3 mode. 

RP/0/RSP0/CPU0:ios# configure
RP/0/RSP0/CPU0:ios(config)# hw-module profile segment-routing srv6 mode micro-segment format f3216
RP/0/RSP0/CPU0:ios(config-srv6)# encapsulation
RP/0/RSP0/CPU0:ios(config-srv6-encap)# traffic-class policy-map-extend

hw-module profile segment-routing srv6 mode base encapsulation traffic-class propagate

To propagate traffic-class from incoming packet or frame or use qos-group from input policy-map, use the hw-module profile segment-routing srv6 mode base encapsulation traffic-class propagate command in XR Config mode.

hw-module profile segment-routing srv6 mode base encapsulation traffic-class propogate | [ { encapsulation l2 traffic-class | | | encapsulation l3 traffic-class } ]

Syntax Description

traffic-class

Control traffic-class field of SRv6 IPv6 header for inner L2 and L3 traffic
traffic-class value

This specifies the traffic-class value. Range is from 0x0 to 0xff.

Traffic-class value must be specified as 2 hexadecimals.
propagate

Propagate traffic-class from incoming packet or frame or use qos-group from input policy-map.

Command Default

None

Command Modes

Global ConfigurationXR Config

Command History

Release Modification
Release 6.6.1

This command was introduced.

Usage Guidelines

After enabling this feature, you must reload the router for the configuration to take effect.

Task ID

Task ID Operation

system

read, write

Examples

The following example shows how to enable the feature that propagates traffic-class from incoming packet or frame or use qos-group from input policy-map.

Examples


Router# configure 
Router(config)# hw-module profile segment-routing srv6 mode base encapsulation traffic-class propagate

hw-module profile sr-policy v6-null-label-autopush

To enable the V6 null label autopush over SR-policy, hw-module profile sr-policy v6-null-label-autopush command in XR Config mode.

hw-module profile sr-policy v6-null-label-autopush

Syntax Description

This command has no keywords or arguments.

Command Default

None

Command Modes

Global ConfigurationXR Config

Command History

Release Modification
Release 6.6.1

This command was introduced.

Usage Guidelines

The router must be reloaded for the hw-module profile sr-policy v6-null-label-autopush feature to be functional.

This profile enables the IPv6 null label autopush over SR policy.

This profile is not supported with 6VPE (the IPv6 null label is pushed rather than 6VPE label).

DSCP preserve is disabled.

With this feature, we can use up to 12 labels for IPv6 .

Task ID

Task ID Operation

system

read, write

Examples

The following example shows how to enable the IPv6 null label autopush over SR policy:

Router# configure 
Router(config)# hw-module profile sr-policy v6-null-label-autopush

hw-module profile stats enh-sr-policy

To enable enhanced SR policy scale stats profile counter, use the hw-module profile stats enh-sr-policy command in XR Config mode.

hw-module profile stats enh-sr-policy

Syntax Description

This command has no keywords or arguments.

Command Default

None

Command Modes

Global ConfigurationXR Config

Command History

Release Modification
Release 6.6.1

This command was introduced.

Usage Guidelines


Note
This command is not supported on the NCS 540 series routers.

The router must be reloaded for the hw-module profile stats enh-sr-policy feature to be functional.

This command enables ingress SR counters and also increases the counters available in the egress pipeline.

Task ID

Task ID Operation

system

read, write

Examples

The following example shows how to enable ingress SR counters:

Router# configure 
Router(config)# hw-module profile stats enh-sr-policy

hw-module profile stats ingress-sr

To enable per-label statistics at “ingress” for Segment Routing labels, use the hw-module profile stats enh-sr-policy command in XR Config mode.

hw-module profile stats ingress-sr

Syntax Description

This command has no keywords or arguments.

Command Default

None

Command Modes

Global ConfigurationXR Config

Command History

Release Modification
Release 6.6.1

This command was introduced.

Usage Guidelines

The router must be reloaded for the hw-module profile stats ingress-sr feature to be functional.

This command enables per-label statistics at ingress for SR labels within the configured SRGB and SRLB.

When this profile is enabled, QoS Stats do not work for the same labeled packets.

Task ID

Task ID Operation

system

read, write

Examples

The following example shows how to enable per-label statistics at ingress for Segment Routing labels:

Router# Configure 
Router(config)# hw-module profile stats ingress-sr

hw-module profile stats tx-scale-enhanced ingress-sr

To enable the ingress segment routing statistics for increasing the Tx scale, use the hw-module profile stats tx-scale-enhanced ingress-sr command in XR Config mode.

hw-module profile stats tx-scaled-enhanced ingress-sr

Syntax Description

This command has no keywords or arguments.

Command Default

None

Command Modes

Global ConfigurationXR Config

Command History

Release Modification
Release 6.6.1

This command was introduced.

Usage Guidelines

The router must be reloaded for the hw-module profile stats tx-scale-enhanced ingress-sr feature to be functional.

Task ID

Task ID Operation

system

read, write

Examples

The following example shows how to enable the ingress segment routing statistics for increasing the Tx scale.

Router# configure 
Router(config)# hw-module profile stats tx-scale-enhanced ingress-sr

index

Marks an explicit path. The index determines the order of path selection.

index index_number { { exclude-address | exclude-srlg | next-address [ loose | strict] } ipv4 unicast ip_address} | { next-label label}

Syntax Description

index_number

Defines priority for the path to be selected.

Ranges from 1 to 65535.

exclude-address

Specifies the IP address to be excluded from the path.

exclude-srlg

Specifies the IP address from which Shared Risk Link Groups (SRLGs) are derived for exclusion.

next-address

Specifies the next IP address in the path.

loose

Specifies the next hop in the path as a flexible hop.

strict

Specifies the next hop in the path as a fixed hop

ipv4 unicast ip_address

Specifies the the IPv4 unicast address.

next-label label

Specifies the next label in the path.

Command Default

None

Command Modes

Explicit path configuration mode

Command History

Release

Modification

Release 6.1.2

This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

You can include multiple addresses, labels, or both. However, once you start configuring labels, you need to continue with labels. You cannot use addresses after you use labels.

Task ID

Task ID Operation

mpls-te

read, write

Examples

This example shows how to insert the next-address and next-label for explicit path ABCD1_Nodes:


RP/0/RSP0/CPU0:router(config)# explicit-path name ABCD1_Nodes 
RP/0/RSP0/CPU0:router(config-expl-path)# index 10 next-address strict ipv4 unicast 
  192.168.0.2
RP/0/RSP0/CPU0:router(config-expl-path)# index 20 next-label 24012

Related Commands

Command

Description

explicit-path

Configures a fixed path through the network.

mdt

To configure a default or partitioned MVPN profile for transporting IP VPN multicast traffic using SR-TE, use the mdt command in multicast routing VRF address family configuration mode. To remove the configuration, use the no form of the command.

mdt { default | partitioned } segment-routing mpls [ color value ] [ fast-reroute lfa ]

Syntax Description

default

Specifies that the MPVN profile is of the type default.

partitioned

Specifies that the MPVN profile is of the type partitioned.

segment-routing mpls

Specifies that the TE mechanism is Segment Routing, and data plane protocol is MPLS.

color value

(Optional) Specifies the on-demand color value that defines TE constraints and optimizations applied to the SR multicast policy.
fast-reroute lfa

(Optional) Enables the LFA FRR function for SR multicast policies that are created for the MDT.

Command Default

An MVPN default or partitioned profile is not configured.

Command Modes

Multicast routing VRF address family configuration.

Command History

Release Modification
Release 7.3.1

This command was introduced.

Usage Guidelines

The mdt configuration is enabled on all the VPN end-points, the PE routers used for MVPN peering.

Examples

The following example shows how to configure a default MDT MVPN Profile for SR multicast: 

Router(config)# multicast-routing vrf cust1 
Router(config-mcast-cust1)# address-family ipv4 
Router(config-mcast-cust1-ipv4)# mdt default segment-routing mpls color 10
Router(config-mcast-cust1-ipv4)# commit

Examples

The following example shows how to configure a partitioned MDT MVPN Profile for SR multicast: 

Router(config)# multicast-routing vrf cust1 
Router(config-mcast-cust1)# address-family ipv4 
Router(config-mcast-cust1-ipv4)# mdt partitioned segment-routing mpls color 10
Router(config-mcast-cust1-ipv4)# commit

mdt data

To configure an MVPN data profile for transporting IP VPN multicast traffic using SR-TE, use the mdt data command in multicast routing VRF address family configuration mode. To remove the configuration, use the no form of the command.

mdt data segment-routing mpls max-mdt-nmr [ color value ] [ fast-reroute lfa ] [ route-policy name ] [ threshold value ] [ ACL ] [ immediate-switch ]

Syntax Description

segment-routing mpls max-mdt-nmr

Specifies the maximum number of SR multicast polices to be used for data MDTs.

color value

(Optional) Specifies the on-demand SR policy color value. The TE constraints and optimizations are associated with the color value.

fast-reroute lfa

(Optional) Enables the LFA FRR function for SR multicast policies that are created for data MDTs.

route-policy name

(Optional) Specifies the route policy that dictates multicast flow-to-SR multicast policy mapping (with different colors).

The route policy option is an alternative to enabling the color value option.

threshold value

(Optional) The traffic rate threshold value in Kbps.

When the rate exceeds the specified value, multicast flow is switched to a data MDT.

ACL

(Optional) ACL that directs specific multicast flows to be switched to a data MDT.

immediate-switch

(Optional) Specifies that the multicast flow be switched to a data MDT, without waiting for the threshold limit to be crossed.

Command Default

An MVPN data profile is not configured.

Command Modes

Multicast routing VRF address family configuration

Command History

Release Modification
Release 7.3.1

This command was introduced.

Usage Guidelines

The mdt data command has to be enabled on the ingress PEs where multicast flows need to be steered into the data MDT component for SR multicast processing. Data MDT can be configured for default and partitioned profiles.

Examples

The following example shows how to configure an MVPN data profile. 

Router(config)# multicast-routing vrf cust1 
Router(config-mcast-cust1)# address-family ipv4 
Router(config-mcast-cust1-ipv4)# mdt data segment-routing mpls 2 color 10
Router(config-mcast-cust1-ipv4)# commit

metric-type generic

To use the user-defined generic metrics as a metric for Flexible Algorithm Definition (FAD), use the metric-type generic command in the IS-IS flexible algorithm configuration mode.

metric-type generic type

Syntax Description

<type>

Specify the generic metric type. The range is 128–255.

Command Default

By default, the generic metric is not used.

Command Modes

IS-IS Flex Algo.

Command History

Release Modification
Release 24.2.1

This command was introduced.

Usage Guidelines

If a user-defined generic metric is enabled, the router advertises and uses the metrics for flexible algorithm computation.

Task ID

Task ID

Operations

isis

read, write

Examples

The following example shows how to associate or advertise the configured user-defined generic metric to a Flexible Algorithm Definition. The user-defined application-specific generic metric is configured for an interface using the generic-metric flex-algo command. 

Router(config)#router isis 1
Router(config-isis)#flex-algo 128
Router(config-isis-flex-algo)#priority 254
Router(config-isis-flex-algo)#metric-type generic 177
Router(config-isis-flex-algo)#advertise-definition

microloop avoidance rib-update-delay

To set the Routing Information Base (RIB) update delay value to avoid microloops in the network, use the microloop avoidance rib-update-delay command. To disable the RIB update delay, use the no form of this command.

microloop avoidance rib-update-delay delay-time

Syntax Description

delay-time

Specifies the amount of time the node uses the microloop avoidance policy before updating its forwarding table. The delay-time is in milliseconds. The range is from 1-60000.

Command Default

The default value is 5000 milliseconds.

Command Modes

IPv4 address family configuration

Router configuration

Command History

Release

Modification

Release 6.3.2

This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

Use this command with the microloop avoidance segment-routing command to specify how long the SR-TE policy path to the destination is used. After the RIB update delay timer expires, the SR-TE policy is replaced with regular forwarding paths.

Task ID

Task ID Operation

ospf

isis

read, write

Examples

This example shows how to set the Routing Information Base (RIB) update delay value for OSPF:


RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router(config)# router ospf 1
RP/0/RSP0/CPU0:router(config-ospf)# microloop avoidance segment-routing 
RP/0/RSP0/CPU0:router(config-ospf)# microloop avoidance rib-update-delay 3000

This example shows how to set the Routing Information Base (RIB) update delay value for IS-IS:


RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router(config)# router isis 1
RP/0/RSP0/CPU0:router(config-isis)# address-family ipv4 unicast 
RP/0/RSP0/CPU0:router(config-isis-af)# microloop avoidance segment-routing 
RP/0/RSP0/CPU0:router(config-isis-af)# microloop avoidance rib-update-delay 3000

microloop avoidance segment-routing

To enable the segment routing microloop avoidance and set the Routing Information Base (RIB) update delay value, use the microloop avoidance command. To disable segment routing microloop avoidance, use the no form of this command.

microloop avoidance segment-routing [ route-policy name ]

Syntax Description

route-policy name

Specifies the route policy for the destination prefixes for per-prefix filtering.

Command Default

Disabled.

Command Modes

IS-IS IPv4 address family configuration

IS-IS IPv6 address family configuration

OSPF configuration

Command History

Release

Modification

Release 6.3.2

This command was introduced.

Release 7.11.1

The route-policy name option is added for IS-IS.

Usage Guidelines

The Segment Routing Microloop Avoidance feature detects if microloops are possible following a topology change. If a node computes that a microloop could occur on the new topology, the node creates a loop-free SR-TE policy path to the destination using a list of segments. After the RIB update delay timer expires, the SR-TE policy is replaced with regular forwarding paths.

SR microloop avoidance per-prefix filtering uses route policies to identify the prefixes subjected to microloop avoidance. A route policy must be defined before it can be attached to the SR microloop avoidance configuration. Once a route policy is defined and attached to the SR microloop avoidance configuration, it cannot be modified or removed until the route policy is removed from the SR microloop avoidance configuration.

Task ID

Task ID Operation

ospf

isis

read, write

Examples

This example shows how to enable Segment Routing Microloop Avoidance for OSPF:

RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router(config)# router ospf 1
RP/0/RSP0/CPU0:router(config-ospf)# microloop avoidance segment-routing 
RP/0/RSP0/CPU0:router(config-ospf)# microloop avoidance rib-update-delay 3000

This example shows how to enable Segment Routing Microloop Avoidance for IS-IS:

RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router(config)# router isis 1
RP/0/RSP0/CPU0:router(config-isis)# address-family ipv4 unicast 
RP/0/RSP0/CPU0:router(config-isis-af)# microloop avoidance segment-routing 
RP/0/RSP0/CPU0:router(config-isis-af)# microloop avoidance rib-update-delay 3000

This example shows how to enable per-prefix filtering for a prefix set defined in "route policy FOO2":

RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router(config)# router isis 1
RP/0/RSP0/CPU0:router(config-isis)# address-family ipv4 unicast 
RP/0/RSP0/CPU0:router(config-isis-af)# microloop avoidance segment-routing route-policy FOO2

partition-detect

Use partition-detect command for an area or domain partition detection. It is a new command under IS-IS address-family sub-mode.

partition-detect { track IPv4 address | IPv6 address [external-id IPv4 -address | IPv6 address ]

Syntax Description

Keyword

Details
track IPv4 address | IPv6 address [external-id IPv4 -address | IPv6 address ]

Tracks the reachability of the specific ABR or ASBR. This command is under the partition-detect sub-mode.

  • Only IPv4 address is allowed under IPv4 address-family sub-mode and only IPv6 address is allowed under IPv6 address-family sub-mode.

  • external-id is only used for ASBR tracking. External-id is the address of the ASBR, in other domain.

Command Default

None.

Command Modes

IS-IS interface address-family configuration

Command History

Release

Modification

Release 7.10.1

This command was introduced.

Task ID

Task ID

Operations

IS-IS

read, write

Examples

This example shows how to configure partition-detect. 


Router(config)#router isis 1
Router(config-isis)#address-family ipv6 unicast 
Router(config-isis-af)#router-id 2001:DB8:4::4
Router(config-isis-af)#partition-detect
Router(config-isis-af)#track 2001:DB8:1::1 
Router(config-isis-af)#commit

path-option

To configure a path option for an SR-TE policy, use the path-option command in tunnel-te interface configuration mode. To return to the default behavior, use the no form of this command.

path-option path_preference_value { dynamic [ attribute-set | isis | lockdown | ospf | pce | protected-by] | explicit { identifier path-number | name path-name} [ attribute-set | isis | lockdown | ospf | protected-by | verbatim] } segment-routing

Syntax Description

path_preference_value

Specifies the preference for an LSP.

Range is from 1 to 1000.

dynamic [ attribute-set | isis | lockdown | ospf | pce | protected-by]

Configures a dynamically allocated path based on the configured options.

See the attribute-set statement for a description of all the attributes.

explicit { identifier path-number | name path-name} [ attribute-set | isis | lockdown | ospf | protected-by | verbatim]

Configures a preset path, based on the configured options.

The verbatim option is required for disabling loop detection on the path. When you configure this option, the topology database is not referred by the source router while configuring the preset path.

See the attribute-set statement for a description of all the attributes.

segment-routing

Configures a segment routing path, based on the configured options.

Command Default

None

Command Modes

Tunnel-te interface configuration

Command History

Release

Modification

Release 6.1.2

This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

Task ID

Task ID Operation

mpls-te

read, write

Examples

This example shows how to configure the tunnel to use an explicit path for segment routing:


RP/0/RSP0/CPU0:router(config)# interface tunnel-te22
RP/0/RSP0/CPU0:router(config-if)# ipv4 unnumbered loopback0
RP/0/RSP0/CPU0:router(config-if)# destination 192.168.0.2
RP/0/RSP0/CPU0:router(config-if)# path-selection segment-routing adjacency protected
RP/0/RSP0/CPU0:router(config-if)# path-option 1 explicit name ABCD1_Nodes segment-routing

Related Commands

Command

Description

attribute-set

Configures the attribute set for an LSP.

index

Determines the order of path selection.

path-selection

Configures the LSP to be selected for the SR-TE tunnel.

path-selection [ cost-limit limit | hop-limit limit | invalidation timer [ tear | drop] | metric [ igp | te] segment-routing adjacency [ protected | unprotected] | tiebreaker [ max-fill | min-fill | random] ]

Syntax Description

cost-limit limit

Configures the cost limit for the LSP.

Ranges from 1 to 4294967295.

hop-limit limit

Configures the hop limit for the LSP.

Ranges from 1 to 255.

invalidation timer [ tear | drop]

Configures the path invalidation timer.

When the timer expires, the path is either torn down or just the segment labeled data is dropped.

Ranges from 0 to 60000.

metric [ igp | te]

Configures the type of metric to be used for the LSP.

segment-routing adjacency [ protected | unprotected]

Configures the type of adjacency for segment routing.

tiebreaker [ max-fill | min-fill | random]

Configures the tie breaker for path calculation of equal cost multiple paths. Max-fill selects the path with the most-utilized links. Min-fill selects the path with the least-utilized links. Random selects the path with randomly utilized links.

Command Default

None

Command Modes

Tunnel interface configuration mode

Command History

Release

Modification

Release 6.1.2

This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

Task ID

Task ID Operation

mpls-te

read, write

Examples

This example shows how to set the path-selection for segment routing adjacency protection.


RP/0/RSP0/CPU0:router(config)# interface tunnel-te22
RP/0/RSP0/CPU0:router(config-if)# path-selection segment-routing adjacency protected

pce segment-routing traffic-eng p2mp

To configure the SR-PCE server for managing multicast traffic flows, use the pce segment-routing traffic-eng p2mp command in global configuration mode. To remove the configuration, use the no form of the command.

pce segment-routing traffic-eng p2mp [ policy name [ candidate-paths [ constraints [ affinity { include-any | include-all | exclude-any } name ] | [ sid-algorithm algo ] ] ] ] [ fast-reroute lfa | frr-node-set { from | to } [ ipv4 address ] ] | [ label-range min value max value ] | [multipath-disable]

Syntax Description

policy name

(Optional) Specifies the static or dynamic SR multicast policy for which LFA FRR is enabled.

constraints

Configures constraints.
affinity {include-all | include-any | exclude-any} name

Configures the affinity constraints and the affinity name.
sid-algorithm algo

Flex-algo value. An algorithm is a one octet value. Values from 128 to 255 are reserved for user defined values and are used for Flexible Algorithm representation.

fast-reroute lfa

Specifies that LFA FRR be enabled on all multicast routers of the SR multicast tree.

frr-node-set {from|to} [ipv4 address]

Specifies the (from and to) paths on multicast routers that requires FRR protection.

The PCE server applies the LFA FRR function for traffic from a specific IP address, sent to specific IP address(es).

label-range min value max value

Specifies the label range to be used for the multicast traffic LSPs.

multipath-disable

Disables load balancing of SR multicast traffic across ECMP paths.

Command Default

The SR-PCE server parameters are disabled.

Command Modes

Global configuration (config)

Command History

Release Modification

Release 7.11.1

The sid-algorithm algo options are introduced.

Release 7.3.1

This command was introduced.

Examples

The following example shows how to configure SR-PCE server parameters.

Label Range Configuration

The configuration specifies that labels between 30000 and 60000 be used for multicast traffic LSPs. 

Router(config)# pce segment-routing traffic-eng p2mp label-range min 30000 max 60000
Router(config)# commit

FRR Configuration

The LFA FRR function is configured for all SR policies. 

Router(config)# pce segment-routing traffic-eng p2mp fast-reroute lfa

The LFA FRR function is configured for the SR policy tree1. 

Router(config)# pce segment-routing traffic-eng p2mp policy tree1 fast-reroute lfa

FRR protection is configured for traffic from the interface with IP address 192.168.0.3, and traffic being sent to the interface with IP address 192.168.0.4. 

Router(config)# pce segment-routing traffic-eng p2mp frr-node-set from ipv4 192.168.0.3
Router(config)# pce segment-routing traffic-eng p2mp frr-node-set to ipv4 192.168.0.4 
Router(config)# commit

Disable Load Balancing

To disable ECMP load splitting of different trees on the SR-PCE server, configure the multipath-disable command. 

Router(config)# pce segment-routing traffic-eng p2mp multipath-disable
Router(config)# commit

Flexible Algorithm

The following example shows how to configure a P2MP policy with Flex-Algo constraint:

Router(config)# pce
Router(config-pce)# segment-routing traffic-eng 
Router(config-pce-sr-te)# p2mp 
Router(config-pce-sr-te-p2mp)# policy FOO
Router(config-pce-p2mp-policy)# candidate-paths 
Router(config-pce-p2mp-policy-path)# constraints 
Router(config-pce-p2mp-path-const)# sid-algorithm 128
Router(config-pce-p2mp-path-const)#

performance-measurement interface

This command helps you configure the target interface with probe packets that transit Interface ID within a network.

performance-measurement interface GigE 0/1/0/1 { path-tracing { { interface-id {1-4095} } } }

Syntax Description

path-tracing

Enables path-tracing for the interface for tracing short timestamp, interface-id and interface load on source, midpoint and sink nodes in PT probes.

interface-id

Enter interface ID that is between 1-4095.

Default value is none. Interface ID value 0 is used internally to indicate PT is disabled on the interface.

Command Default

Path tracing is disabled by default.

The default value for Interface ID is set to None.

Command Modes

Global ConfigurationXR Config

Command History

Release Modification
Release 7.8.1

This command was introduced.

Usage Guidelines

Enable path-tracing for the interface for tracing interface-id and interface load on source, midpoint and sink nodes in PT probes.

Examples

This example shows how to configure Path Tracing midpoint with InterfaceID:

Router(config)# performance-measurement
Router(config-pm)# interface FourHundredGigE0/0/0/1
Router(config-pm-interf)# path-tracing
Router(config-pm-interf-interf-id)# interface-id 200 
Router(config-pm-interf-time)# exit

performance-measurement delay-measurement

To apply an SR performance measurement delay profile to an SR-TE policy, use the performance-measurement delay-measurement command in the SR-TE policy configuration mode. To disassociate the profile from the SR-TE policy, use the no form of the command.

performance-measurement delay-measurement [ delay-profile name profile ]

no performance-measurement delay-measurement [ delay-profile ]

Syntax Description

delay-profile name profile

(Optional) Specifies the delay profile that is to be associated with the SR-TE policy.

Command Default

The Default performance measurement delay profile is associated with an SR-TE policy.

Command Modes

SR-TE policy configuration (config-sr-te-policy)
On-Demand SR-TE policy configuration (config-sr-te-color)

Command History

Release Modification
Release 7.3.1

This command was introduced.

Usage Guidelines

The performance-measurement command is also available in global configuration mode. Amongst other configurations, you can use it for creating a Segment Routing performance measurement delay and liveness profiles.

Examples

This example shows how to associate a delay profile to an SR-TE policy:

Router(config)# segment-routing traffic-eng
Router(config-sr-te)# policy TEST
Router(config-sr-te-policy)# color 4 end-point ipv4 10.10.10.10
Router(config-sr-te-policy)# performance-measurement delay-measurement delay-profile name profile2
Router(config-sr-te-policy-perf-meas)# commit


Router(config-sr-te)# on-demand color 20
Router(config-sr-te-color)# performance-measurement delay-measurement delay-profile name profile2 
Router(config-sr-te-color)# commit

performance-measurement delay-profile endpoint

To detect the delay of an endpoint, use the performance-measurement delay-profile endpoint command in global configuration. To disable the delay-profile, use the no form of the command.

performance-measurement delay-profile endpoint { default | name name } { advertisement accelerated { minimum-change value | threshold value } | logging delay-exceeded | periodic { disabled | interval value | minimum-change value | threshold value } | threshold-check { average-delay | maximum-delay | minimum-delay } | probe { burst-interval interval | tx-interval interval | computation-interval interval | measurement-mode { one-way | two-way | loopback } | timestamp-format NTP | tos dscp value | flow-label { explicit value | from value to value increment value } } }

Syntax Description

advertisement

Enter interface delay profile advertisement submode

accelerated

Enter interface delay profile advertisement accelerated submode

minimum change microseconds

The range is from 0 to 100000 microseconds.
threshold percent

Checks the minimum-delay metric change for threshold crossing for accelerated advertisement. The range is from 0 to 100 percent.
logging delay-exceeded

Sends syslog when the delay exceeds the threshold.
periodic

Enter periodic advertisement configuration submode.
disabled

Disables periodic advertisement.

interval seconds

Periodic advertisement and metric aggregation interval. The interval range is from 30 to 3600 seconds.
minimum-change microseconds

The range is from 0 to 100000 microseconds.
threshold percent

Checks the minimum-delay metric change for threshold crossing for periodic advertisement. The range is from 0 to 100 percent.
threshold-check {average-delay | maximum-delay |minimum-delay}

max = default
probe

Enter probe configuration submode.
burst-interval microseconds

Specify the interval for sending probe packet. The range is from 30 to 15000 milliseconds.
tx-interval microseconds

Specify the transmission interval. The allowed range is from 30000 to 15000000 micro seconds.
computation-interval seconds

Specify the interval for metric computation. The range is from 1 to 3600 seconds.
measurement-mode {one-way | two-way|loopback}

Specify the delay measurement mode.

tos dscp value

Type of Service DSCP. The range is from 0 to 63.

flow-labelexplicit value

Specify explicit list of flow labels. The range is from 1 to 28 flow labels.

flow-labelfrom value to value increment

Specify the flow labels range. The range is from 1 to 28 flow labels.

timestamp-format NTP

Specify the software timestamp as NTP.

Command Default

The default advertisement accelerated minimum change is 500 microseconds.

The default advertisement accelerated threshold is 20 percent.

The default advertisement periodic interval is 120 seconds.

The default advertisement periodic minimum-change is 500 microseconds.

The default advertisement periodic threshold is 10 percent.

The default advertisement threshold-check is maximum-delay.

The default burst-interval is 3000 microseconds.

The default computation-interval is 30 seconds.

The default measurement-mode is one-way.

The default ToS DSCP value is 48 for IP/UDP.

Command Modes

Global ConfigurationXR Config

Command History

Release Modification
Release 7.4.1

This command was introduced.

Release 7.6.1

The name name keyword was deprecated. Use the performance-measurement delay-profile name command to create a named profile.

Release 7.10.1

The burst-interval interval keyword was deprecated.


Note

Loopback is not supported on IOS-XR software releases 7.10.x and 7.11.x.

Examples

Router(config)# performance-measurement
Router(config-perf-meas)# delay-profile endpoint default
Router(config-pm-dm-ep)# probe
Router(config-pm-dm-ep-probe)# measurement-mode one-way

The following example shows how to configure flow label for delay profile.


RP/0/RSP0/CPU0:ios#configure
RP/0/RSP0/CPU0:ios(config)#performance-measurement
RP/0/RSP0/CPU0:ios(config-perf-meas)#delay-profile endpoint default          
RP/0/RSP0/CPU0:ios(config-pm-dm-ep)#probe 
RP/0/RSP0/CPU0:ios(config-pm-dm-ep-probe)#flow-label explicit 100 200 300

performance-measurement delay-profile interfaces

performance-measurement delay-profile interfaces { default | name name } { advertisement { accelerated { minimum-change value | threshold value } | anomaly-check upper-bound upper_bound lower-bound lower_bound | logging delay-exceeded | periodic { disabled | interval value | minimum-change value | threshold value } } | probe { burst-interval value | tx-interval interval | computation-interval value | measurement-mode { one-way | two-way } | timestamp-format NTP | protocol { pm-mpls | twamp-light } | tos dscp value } }

Syntax Description

advertisement

Enter interface delay profile advertisement submode.

accelerated

Enter interface delay profile advertisement accelerated submode.

minimum change microseconds

The range is from 0 to 100000 microseconds.
threshold percent

Checks the minimum-delay metric change for threshold crossing for accelerated advertisement. The range is from 0 to 100 percent.
anomaly-check upper-bound upper_bound lower-bound lower_bound

Specify the upper and lower bounds of the interface delay profile advertisement anomaly check. The range for upper_bound and lower_bound is from 1 to 200000 microseconds.

logging delay-exceeded

Sends syslog when the delay exceeds the threshold.
periodic

Enter periodic advertisement configuration submode.
disabled

Disables periodic advertisement.

interval seconds

Periodic advertisement and metric aggregation interval. The interval range is from 30 to 3600 seconds.
minimum-change microseconds

The range is from 0 to 100000 microseconds.
threshold percent

Checks the minimum-delay metric change for threshold crossing for periodic advertisement. The range is from 0 to 100 percent.
probe

Enter probe configuration submode.
burst-interval microseconds

Specify the interval for sending probe packet. The range is from 30 to 15000 milliseconds.
tx-interval value

Specify the transmission interval. The allowed range is from 30000 to 15000000 micro seconds.
computation-interval seconds

Specify the interval for metric computation. The range is from 1 to 3600 seconds.
measurement-mode {one-way | two-way}

Specify the delay measurement mode.

protocol {pm-mpls | twamp-light}
tos dscp value

Type of Service DSCP. The range is from 0 to 63.

timestamp-format NTP

Specify the software timestamp as NTP.

Command Default

The default advertisement accelerated minimum change is 500 microseconds.

Default measurement-mode for interfaces is two-way whereas others is one-way.

The default advertisement accelerated threshold is 20 percent.

The default advertisement periodic interval is 120 seconds.

The default advertisement periodic minimum-change is 500 microseconds.

The default advertisement periodic threshold is 10 percent.

The default burst-interval is 3000 microseconds.

The default computation-interval is 30 seconds.

The default measurement-mode is two-way.

The default protocol is TWAMP-light.

The default ToS DSCP value is 48 for IP/UDP.

Command Modes

Global ConfigurationXR Config

Command History

Release Modification
Release 7.3.1

This command was introduced.

Release 7.4.1 The anomaly-check upper-bound upper_bound lower-bound lower_bound command is introduced.

Release 7.6.1

The name name keyword was deprecated. Use the performance-measurement delay-profile name command to create a named profile.

Release 7.10.1

The burst-interval interval keyword was deprecated.

Usage Guidelines

Examples

This example shows how to configure performance-measurement functionalities for link delay as a global default profile.

RP/0/0/CPU0:router(config)# performance-measurement delay-profile interfaces default
RP/0/0/CPU0:router(config-pm-dm-intf)# probe
RP/0/0/CPU0:router(config-pm-dm-intf-probe)# measurement-mode one-way
RP/0/0/CPU0:router(config-pm-dm-intf-probe)# burst-interval 60
RP/0/0/CPU0:router(config-pm-dm-intf-probe)# computation-interval 60
RP/0/0/CPU0:router(config-pm-dm-intf-probe)# exit
RP/0/0/CPU0:router(config-pm-dm-intf)# advertisement periodic
RP/0/0/CPU0:router(config-pm-dm-intf-adv-per)# interval 120
RP/0/0/CPU0:router(config-pm-dm-intf-adv-per)# threshold 20
RP/0/0/CPU0:router(config-pm-dm-intf-adv-per)# minimum-change 1000
RP/0/0/CPU0:router(config-pm-dm-intf-adv-per)# exit
RP/0/0/CPU0:router(config-pm-dm-intf)# advertisement accelerated
RP/0/0/CPU0:router(config-pm-dm-intf-adv-acc)# threshold 30
RP/0/0/CPU0:router(config-pm-dm-intf-adv-acc)# minimum-change 1000
RP/0/0/CPU0:router(config-pm-dm-intf-adv-per)# exit

This example shows how to define thresholds above which delay and loss are considered “anomalous.”

RP/0/0/CPU0:router(config)# performance-measurement delay-profile interfaces default
RP/0/0/CPU0:router(config-pm-dm-intf)# advertisement
RP/0/0/CPU0:router(config-pm-dm-intf-adv)# anomaly-check upper-bound 5000 lower-bound 1000
RP/0/0/CPU0:router(config-pm-dm-intf-adv)# interval 120
RP/0/0/CPU0:router(config-pm-dm-intf-adv)# threshold 20
RP/0/0/CPU0:router(config-pm-dm-intf-adv)# minimum-change 1000
RP/0/0/CPU0:router(config-pm-dm-intf-adv)# exit

performance-measurement delay-profile name

To detect the delay of an name, use the performance-measurement delay-profile name command in global configuration. To disable the delay-profile, use the no form of the command.

performance-measurement delay-profile name value probe [ flow-label { explicit value | from value to value increment value } | measurement-mode { one-way | two-way | loopback } | sweep destination ipv4 ip-address range range-value | tos { dscp value | traffic-class value } | tx-interval value ]

Syntax Description

flow-label{explicit value | from value to value increment}

Specify explicit list of flow labels or specify the range. The range is from 1 to 28 flow labels.
measurement-mode {one-way | two-way|loopback}

Specify the delay measurement mode. There are three options:

one-way: Measures the one way delay with timestamp 1 and 2.

two-way: Measures the one way delay with timestamp 1, 2, 3 and 4 without clock synchronization.

loopback: Measures the delay in loopback mode.
sweep destination ipv4ip-addressrangevalue

Specify the sweep IP destination addresses to perform ECMP hashing.

The IPv4 adress range is 0 to 128.
tos {dscp value | tos traffic-class value} Specify the delay probe type of service. The allowed range for DSCP is 0 to 63.

specify the traffic class value to indicate the TOS level used by protocol PM MPLS. The range is from 0 to 7.
tx-interval value

Specify the transmission interval. The allowed range is from 30000 to 15000000 micro seconds.

From release Release 24.2.1 onwards, the allowed range is from 15000 to 15000000 micro seconds.

probe

Enter probe configuration submode.

timestamp-format NTP

Specify the software timestamp as NTP.

Command Default

The default measurement-mode is one-way.

The default ToS DSCP value is 48 for IP/UDP.

Command Modes

Global ConfigurationXR Config

Command History

Release Modification
Release 7.4.1

This command was introduced.

Release 7.6.1

The name name keyword was deprecated. Use the performance-measurement delay-profile name command to create a named profile.

Release 24.2.1

The command is modified to include the flow-label keyword.

The modified range for tX interval value is from 15000 to 15000000 micro seconds.

Examples

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance. 

Router(config)# performance-measurement
Router(config-perf-meas)# delay-profile endpoint default
Router(config-pm-dm-ep)# probe
Router(config-pm-dm-ep-probe)# measurement-mode one-way

The following example shows how to configure flow label for delay profile.


RP/0/RSP0/CPU0:ios#configure
RP/0/RSP0/CPU0:ios(config)#performance-measurement
RP/0/RSP0/CPU0:ios(config-perf-meas)#delay-profile endpoint default          
RP/0/RSP0/CPU0:ios(config-pm-dm-ep)#probe 
RP/0/RSP0/CPU0:ios(config-pm-dm-ep-probe)#flow-label explicit 100 200 300

performance-measurement delay-profile

To create a unique Segment Routing performance measurement delay profile, use the performance-measurement delay-profile command in global configuration mode.

performance-measurement delay-profile { sr-policy default } { endpoint default } { interface default } { name | | string name } advertisement { anomaly-loss } { anomaly-check } upper-bound <1-99> lower-bound <number lower than the upper bound (0-98)>


Note

Synthetic Loss Measurement is an inbuilt feature of delay measurement. To get the packet loss information for delay-measurement sessions, you only need to configure the delay sessions. No additional configuration is required for Synthetic Loss Measurement.

Syntax Description

name string name

(Optional) Specifies the Segment Routing performance measurement delay profile name.

sr-policy default

(Optional) Specifies the Segment Routing performance measurement default sr-policy name.

endpoint default

(Optional) Specifies the Segment Routing performance measurement default endpoint name.

interface default

(Optional) Specifies the Segment Routing performance measurement default interface.

advertisement

Specifies the Segment Routing performance measurement advertisement you want to configure.
anomaly-check

(optional) It checks the delay metrics, for example if the min delay changes exceed the configured threshold, it advertises ANOM-MIN-DYN; if you configured the anomaly-check and the static delay, and the configured static delay exceed the threshold, it advertises ANOM-MIN-STA.

You can configure the anomaly loss with upper-bound and lower-bound values.

  • upper-bound specifies the upper limit for the anomaly check. It must be between 2-200000

  • lower-bound specifies the lower limit for the anomaly check. It must be between 1-199999 and lower than the upper-bound value.

anomaly-loss

(optional) Once the packet loss exceed the configured threshold, it advertises ANOM-PKT-LOSS.

You can configure the anomaly loss with upper-bound and lower-bound values.

  • upper-bound specifies the upper limit for the anomaly loss. It must be between 1-99

  • lower-bound specifies the lower limit for the anomaly loss. It must be between 0-98 and lower than the upper-bound value.

If both anomaly-check and anomaly-loss are triggered, then it advertises for anomaly-check, because it has a higher priority than anomaly-loss

  • min delay changes = current min delay - previous min delay

  • packet loss = (expected packet number - received packet number) / expect packet number * 100%

Command Default

No user created performance measurement delay profile exists.

Command Modes

Global configuration (config)

Command History

Release Modification

Release 24.1.1

The anomaly-loss keyword was introduced.

Release 7.6.1

This command was deprecated and replaced with the performance-measurement delay-profile command.

Release 7.3.1

This command was introduced.

Task ID

Task ID Operation

performance-measurement

write/read

Usage Guidelines

The performance-measurement command is also available in SR-TE specific configuration.

Examples

This example shows how to create a unique Segment Routing performance measurement delay profile:

Router(config)# performance-measurement delay-profile sr-policy name profile1
Router(config)# commit
This example shows the example of anomaly-loss:

Router(config)#performance-measurement
Router(config-perf-meas)#delay-profile sr-policy default
Router(config-pm-dm-srpolicy)#advertisement
Router(config-pm-dm-srpolicy-adv)#anomaly-loss
Router(config-pm-dm-srpolicy-adv-anom-loss)#upper-bound 30 lower-bound 20
Router(config-pm-dm-srpolicy-adv-anom-loss)#commit
This example shows the example of anomaly-check:

Router(config)#performance-measurement
Router(config-perf-meas)#delay-profile sr-policy default
Router(config-pm-dm-srpolicy)#advertisement
Router(config-pm-dm-srpolicy-adv)#anomaly-check
Router(config-pm-dm-srpolicy-adv-anom-loss)#upper-bound 2000 lower-bound 20
Router(config-pm-dm-srpolicy-adv-anom-loss)#commit

performance-measurement endpoint

To enable endpoint for the performance measurement, use the performance-measurement endpoint command in global configuration mode. To disable the endpoint, use the no form of the command.

performance-measurement endpoint ipv4 | ipv6 endpoint_ip_addr [ vrf name ] [ delay-measurement [ delay-profile name profile_name ] | description description | liveness-detection [ liveness-profile name profile_name ] | segment-list name sidlist_name | source-address ipv4 | ipv6 source_ip_addr ]

Syntax Description

endpoint_ip_addr

IPv4 and IPv6 address of the endpoint.

vrf name

The name of the VRF instance.
delay-measurement

Enable delay-measurement on the endpoint.
delay-profile name profile_name

Specify an optional delay profile name.
description description

Specify a description for the endpoint.
liveness-detection

Enable liveness-detection on the endpoint.
liveness-profile name profile_name

Specify an optional liveness profile name.
segment-list name sidlist_name

Specify a segment list for the endpoint.

source-address ipv4 source_ip_addr

IPv4 address of the sender.
source-address ipv6 source_ip_addr

IPv6 address of the sender.

Command Default

None

Command Modes

Global ConfigurationXR Config

Command History

Release Modification
Release 24.2.1

The command was modified to include IPv6 endpoint.

Release 7.4.1

This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

Examples

The following example show how to enable IPv4 endpoint for the delay measurement.

Router(config)# performance-measurement
Router(config-perf-meas)# endpoint ipv4 10.10.1.5
Router(config-pm-ep)# source-address ipv4 10.10.1.1
Router(config-pm-ep)# delay-measurement

The following example show how to configure IPv6 endpoint for liveness.


Router(config)#performance-measurement
Router(config-perf-meas)#source-address ipv6 FCBB:0:1::
Router(config-perf-meas)#endpoint ipv6 FCBB:0:5::
Router(config-pm-ep)#exit             
Router(config-perf-meas)#liveness-profile endpoint default

performance-measurement liveness-detection

To apply an SR performance measurement liveness profile to an SR-TE or an SRv6-TE policy, use the performance-measurement liveness-detection command in the SR-TE policy configuration mode. To disassociate the profile from the SR-TE policy, use the no form of the command.

performance-measurement liveness-detection [ liveness-profile [backup] name profile | validation-cp minimum-active segment-lists [ 1-128 | all ] ]

Syntax Description

liveness-profile [backup] name profile

(Optional) Specifies the liveness profile that is to be associated with the SR-TE policy.

The name profile command form specifies the liveness profile, and the backup name profile command form specifies the backup liveness profile.

validation-cp minimum-active

(Optional) Validates the activeness of the candidate-path based on minimum number of active segment-lists.

segment-lists

Indicates the number of active segment-lists.

1-128 | all

  • 1-128: Indicates the minimum number of segment-lists to have the PM liveness session up.

  • all: Indicates that all the segment-lists should be active to have the PM liveness session up.

Command Default

The Default performance measurement liveness profile is associated with an SR-TE policy.

Command Modes

SR-TE policy configuration (config-sr-te-policy)
On-Demand SR-TE policy configuration (config-sr-te-color)

Command History

Release Modification
Release 7.11.1

The validation-cp minimum-active segment-lists option was introduced.

Release 7.4.2

The backup keyword was added to the command.

Release 7.3.1

This command was introduced.

Usage Guidelines

Path protection policies do not fully support PCE reporting of the standby LSP.

Examples

This example shows how to associate a liveness profile to an SR-TE policy:

Router(config)#segment-routing traffic-eng
Router(config-sr-te)#policy TRST2
Router(config-sr-te-policy)#color 40 end-point ipv4 20.20.20.20
Router(config-sr-te-policy)#performance-measurement liveness-detection liveness-profile name profile3 

Router(config)#segment-routing traffic-eng
Router(config-sr-te)#on-demand color 30
Router(config-sr-te-color)#performance-measurement liveness-detection liveness-profile name profile3
Router(config-sr-te-color)#commit

This example shows how to associate a backup liveness profile to an SR-TE policy:

RP/0/RSP0/CPU0:ios# configure 
RP/0/RSP0/CPU0:ios(config)#segment-routing traffic-eng 
RP/0/RSP0/CPU0:ios(config-sr-te)#policy foo 
RP/0/RSP0/CPU0:ios(config-sr-te-policy)# color 10 end-point ipv4 192.168.0.3  
RP/0/RSP0/CPU0:ios(config-sr-te-policy)# performance-measurement  
RP/0/RSP0/CPU0:ios(config-sr-te-policy-perf-meas)# liveness-detection 
RP/0/RSP0/CPU0:ios(config-sr-te-policy-live-detect)# liveness-profile name profile-WORKING 
RP/0/RSP0/CPU0:ios(config-sr-te-policy-live-detect)# liveness-profile backup name profile-PROTECT 
RP/0/RSP0/CPU0:ios(config-sr-te-policy-live-detect)# commit
This example shows how to activate two segment-lists to have the PM liveness session up:
Router(config)#segment-routing 
Router(config-sr)#traffic-eng 
Router(config-sr-te)#policy po-103
Router(config-sr-te-policy)#performance-measurement 
Router(config-sr-te-policy-perf-meas)#liveness-detection
Router(config-sr-te-policy-live-detect)#validation-cp minimum-active segment-lists 2

performance-measurement liveness-profile endpoint

performance-measurement liveness-profile endpoint { default | name name } { liveness-detection { logging state-change detected | multiplier value } | probe { burst-interval value | tx-interval interval | tos dscp value } }

Syntax Description

default

The default profile.
name name

The name of profile.
liveness-detection

Enter endpoint liveness detection submode.

logging state-change detected

Display a syslog when the liveness state change detected.

multiplier value

Specify the number of probe packets sent before the head-end node assumes the candidate path is down.
probe

Enter endpoint liveness detection probe submode.
burst-interval interval

Specify the interval for sending probe packet. The range is from 30 to 15000 milliseconds.
tx-interval value

Specify the transmission interval. The allowed range is from 30000 to 15000000 micro seconds.
tos dscp value

Type of Service DSCP. The range is from 0 to 63.

Command Default

Default burst interval is 3000 milliseconds (3 seconds).

Default ToC DSCP value is 48.

Command Modes

Global ConfigurationXR Config

Command History

Release Modification
Release 7.4.1

This command was introduced.

Release 7.6.1

The name name keyword was deprecated. Use the performance-measurement liveness-profile name command to create a named profile.

Release 7.10.1

The burst-interval interval keyword was deprecated.

Usage Guidelines

Liveness-detection and delay-measurement aren't supported together

Examples

Router(config)# performance-measurement
Router(config-perf-meas)# liveness-profile endpoint default
Router(config-pm-ld-ep)# liveness-detection
Router(config-pm-ld-ep-ld)# multiplier 3
Router(config-pm-ld-ep-ld)# exit
Router(config-pm-ld-ep)# probe
Router(config-pm-ld-ep-probe)# measurement-mode loopback

performance-measurement liveness-profile

To create a unique Segment Routing performance measurement liveness profile, use the performance-measurement liveness-profile command in global configuration mode. To remove the profile, use the no form of the command.

performance-measurement liveness-profile [ name [ name npu-offload enable ] | probe flow-label [ explicit | from ] tx-interval value ] [ sr-policy default [ npu-offload enable ] | probe flow-label [ explicit | from ] tx-interval value ]

Table 2. Syntax Description

Syntax

Description
name name

Specifies the Segment Routing performance measurement liveness profile name.

sr-policy default

Specifies the Segment Routing performance measurement liveness policy default.

npu-offload

Enables performance measurement liveness hardware (NPU) offload feature in SR.

probe

Enter the liveness detection probe sub mode.

flow-label

Indicates the flow labels associated with SRv6 header.
explicit | from Specify explicit flow label values or enter a range of flow labels that you want to configure. You can configure flow labels in the 0 to 1048575 range.
tx-interval value

Specify the transmission interval. The allowed range for

  • NPU sessions is from 3300 to 15000000 micro seconds.

  • CPU sessions is from 30000 to 15000000 micro seconds.

From Release 24.2.1 onwards, the allowed range for CPU sessions is from 15000 to 15000000 micro seconds.

Note

 

The modified range is applicable to both the liveness-profile sr-policy default and liveness-profile name CLI commands.

Command Default

No user created performance measurement liveness profile exists.

Command Modes

Global configuration (config)

Command History

Release Modification
Release 24.2.1

The modified range for CPU sessions tx-interval value is from 15000 to 15000000 micro seconds.

Release 7.11.1

The flow-label keyword was introduced.

Release 7.10.1

npu-offload was introduced.

Use performance-measurement liveness-profile name liveness profile name .

Note

 

  • performance-measurement liveness-profile name name (named profile) and performance-measurement liveness-profile sr-policy default (default profile) are supported.

  • performance-measurement liveness-profile sr-policy name is deprecated.

Release 7.6.1

This performance-measurement liveness-profile sr-policy was introduced.

Usage Guidelines

The performance-measurement command is also available in SR-TE specific configuration.

Examples

This example shows how to create a unique Segment Routing performance measurement liveness profile:

Router(config)# performance-measurement liveness-profile name profile1
Router(config)# commit
This example shows how to configure a range of flow labels in the SRv6 header:
Router#configure 
Router(config)#performance-measurement 
Router(config-perf-meas)#liveness-profile name name1
Router(config-pm-ld-profile)# probe flow-label from 0 to 1000000 increment 10
Routerconfig-pm-ld-profile)#commit
This example shows how to explicitly configure flow labels in the SRv6 header:
Router#configure 
Router(config)#performance-measurement 
Router(config-perf-meas)#liveness-profile name name1
Router(config-pm-ld-profile)# probe flow-label explicit 100 200 300 400 500
Routerconfig-pm-ld-profile)#commit

performance-measurement protocol twamp-light measurement delay

To configure the querier or responder nodes to accept packets from specific IP addresses on the network, use the performance-measurement protocol twamp-light measurement delay command in the global configuration mode. To remove the IP addresses, use the no form of the command.

performance-measurement protocol twamp-light measurement delay { querier allow responder address { ipv4 | ipv6 } | responder allow querier address { ipv4 | ipv6 } | unauthenticated { ipv4 | ipv6 | querier-dst-port | querier-src-port } }

Syntax Description

querier

Enter the querier submode to configure the IP addresses on a querier node.

responder

Enter the responder submode to configure the IP address on a responder node.

allow responder

Specifies the allowed responder address on the querier node. The configuration is applicable to delay measurement sessions.

allow querier

Specifies the allowed querier addresses on the responder node. The configuration is applicable to delay measurement sessions.
address

Specifies the querier or responder IP addresses that are configured.

{ ipv4 | ipv6 }

Configure the allowed querier or responder ipv4 or ipv6 addresses.

You can specify the prefix for the IP addresses.
unauthenticated Enter the unauthenticated submode to configure the IP address timestamp or the source and destination UDP ports.
ipv4 | ipv6

Configure the timestamp for ipv4 or ipv6 addresses.
querier-dst-port

Configure the UDP port to process queries. By default, the TWAMP reserved UDP destination port is 862.

querier-src-port

UDP port on Route Processor used as source port in queries.

Command Default

None.

Command Modes

Global Configuration

Command History

Release Modification
Release 7.11.1

The querier and responder keywords were introduced.

Release 7.0.1

This command was introduced.

Usage Guidelines

None.

Examples

This example shows how to configure the IP address of a querier on a responder node for delay measurement.

Router#configure
Router(config)#performance-measurement
Router(config-perf-meas)#protocol twamp-light
Router(config-pm-protocol)#measurement delay
Router(config-pm-proto-meas)#responder
Router(config-pm-proto-responder)#allow-querier
Router(config-pm-allowed-querier)#address ipv4 10.10.10.1
Router(config-sr-te-color)#commit

ping sr-mpls

To check the connectivity of segment routing control plane, use the ping sr-mpls command in XR EXEC mode.

ping sr-mpls { ipv4-address/mask | ipv6-address/mask [ fec-type { bgp | generic | igp { ospf | isis } } ] | nil-fec | dataplane-only { labels { label1 [ , label2... ] ipv4-address/mask | ipv6-address/mask | policy } } { output { interface interface-path-id } } | { nexthop next-hop-ip-address } }

Syntax Description

ipv4-address/mask or ipv6-address/mask

Address prefix of the target and number of bits in the target address network mask.

fec-type

(Optional) Specifies FEC type to be used. Default FEC type is generic.

bgp

Use FEC type as BGP.

generic

Use FEC type as generic

igp

Use FEC type as OSPF or IS-IS.

labels label1, label2...

Specifies the label stack. Use commas to separate each label.

dataplane-only

Specifies data plane validation without running actual traffic over LSPs.

output interface interface-path-id

Specifies the output interface where echo request packets are sent.

nexthop next-hop-ip-address

Causes packets to go through the specified IPv4 or IPv6 next-hop address.

Command Default

fec-type : generic

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 24.2.1

The dataplane-only keyword was introduced.

Support for IPv6 next-hop address was added.

Release 6.3.1

This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

Task ID

Task ID

Operations

mpls-te

read, write

Examples

Example

These examples show how to use segment routing ping to test the connectivity of segment routing control plane. In the first example, FEC type is not specified. You can also specify the FEC type as shown in the second example. 

RP/0/RP0/CPU0:router# ping sr-mpls 10.1.1.2/32
 
Sending 5, 100-byte MPLS Echos to 10.1.1.2/32,
      timeout is 2 seconds, send interval is 0 msec:
 
Codes: '!' - success, 'Q' - request not sent, '.' - timeout,
  'L' - labeled output interface, 'B' - unlabeled output interface, 
  'D' - DS Map mismatch, 'F' - no FEC mapping, 'f' - FEC mismatch,
  'M' - malformed request, 'm' - unsupported tlvs, 'N' - no rx label, 
  'P' - no rx intf label prot, 'p' - premature termination of LSP, 
  'R' - transit router, 'I' - unknown upstream index,
  'X' - unknown return code, 'x' - return code 0
 
Type escape sequence to abort.
 
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/5 ms

RP/0/RP0/CPU0:router# ping sr-mpls 10.1.1.2/32 fec-type igp ospf
 
Sending 5, 100-byte MPLS Echos to 10.1.1.2/32,
      timeout is 2 seconds, send interval is 0 msec:
 
Codes: '!' - success, 'Q' - request not sent, '.' - timeout,
  'L' - labeled output interface, 'B' - unlabeled output interface, 
  'D' - DS Map mismatch, 'F' - no FEC mapping, 'f' - FEC mismatch,
  'M' - malformed request, 'm' - unsupported tlvs, 'N' - no rx label, 
  'P' - no rx intf label prot, 'p' - premature termination of LSP, 
  'R' - transit router, 'I' - unknown upstream index,
  'X' - unknown return code, 'x' - return code 0
 
Type escape sequence to abort.
 
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/2 ms

The following example shows how to use segment routing ping to validate SR-MPLS over IPv6-based LSPs:

Router#ping sr-mpls dataplane-only 2001:DB8::1/32
Tue Jan 16 15:05:19.120 EST
 
Sending 5, 100-byte MPLS Echos with Nil FEC to 2001:DB8::1/32,
      timeout is 2 seconds, send interval is 0 msec:
 
Codes: '!' - success, 'Q' - request not sent, '.' - timeout,
  'L' - labeled output interface, 'B' - unlabeled output interface,
  'D' - DS Map mismatch, 'F' - no FEC mapping, 'f' - FEC mismatch,
  'M' - malformed request, 'm' - unsupported tlvs, 'N' - no rx label,
  'P' - no rx intf label prot, 'p' - premature termination of LSP,
  'R' - transit router, 'I' - unknown upstream index,
  'X' - unknown return code, 'x' - return code 0
 
Type escape sequence to abort.
 
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/2/8 ms

The following example shows how to use segment routing ping for SR-TE policies with IPv6-based LSPs:

Router#ping sr-mpls nil-fec policy name srte_c_40_ep_2001:DB8::1
Tue Feb  6 12:08:28.277 EST

Sending 5, 100-byte MPLS Echos with Nil FEC for SR-TE Policy srte_c_40_ep_2001:DB8::1,
      timeout is 2 seconds, send interval is 0 msec:

Codes: '!' - success, 'Q' - request not sent, '.' - timeout,
  'L' - labeled output interface, 'B' - unlabeled output interface, 
  'D' - DS Map mismatch, 'F' - no FEC mapping, 'f' - FEC mismatch,
  'M' - malformed request, 'm' - unsupported tlvs, 'N' - no rx label, 
  'P' - no rx intf label prot, 'p' - premature termination of LSP, 
  'R' - transit router, 'I' - unknown upstream index,
  'X' - unknown return code, 'x' - return code 0

Type escape sequence to abort.

!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 2/2/3 ms

The following example shows how to use segment routing ping with labels using IPv6 LSPs: 

Router#ping sr-mpls labels 18004 lsp-end-point 2001:DB8::1
Tue Feb  6 12:11:05.349 EST

Sending 5, 100-byte MPLS Echos with NIL FEC with lsp end point 2001:DB8::1, SID Label(s) [18004],
      timeout is 2 seconds, send interval is 0 msec:

Codes: '!' - success, 'Q' - request not sent, '.' - timeout,
  'L' - labeled output interface, 'B' - unlabeled output interface, 
  'D' - DS Map mismatch, 'F' - no FEC mapping, 'f' - FEC mismatch,
  'M' - malformed request, 'm' - unsupported tlvs, 'N' - no rx label, 
  'P' - no rx intf label prot, 'p' - premature termination of LSP, 
  'R' - transit router, 'I' - unknown upstream index,
  'X' - unknown return code, 'x' - return code 0

Type escape sequence to abort.

!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 2/2/4 ms

prefix-sid

To specify or advertise prefix (node) segment ID (SID) on all routers, use the prefix-sid command in IS-IS interface address family or OSPF interface configuration mode. To stop advertising prefix SID, use the no form of this command.

prefix-sid [ strict-spf ] { index sid-index | absolute sid-value } [ n-flag-clear ] [ explicit-null ]

no prefix-sid [ strict-spf ] { index sid-index | absolute sid-value } [ n-flag-clear ] [ explicit-null ]

Syntax Description

strict-spf

Specifies that the prefix-SID should use the SPF path instead of the SR-TE policy.

index sid-index

Specifies the prefix SID based on the lower boundary of the SRGB + the index.

absolute sid-value

Specifies the specific prefix SID value within the SRGB.

n-flag-clear

Specifies that the prefix-SID is not a node-SID by setting the N flag in the prefix-SID sub Type Length Value (TLV) to 0.

explicit-null

Adds an explicit-Null label by setting the E flag in the prefix-SID sub TLV to 1. Automatically disables penultimate-hop-popping (PHP) by setting the P flag (IS-IS) or NP flag (OSPF) to 1.

Command Default

Prefix SID is a node SID (N-flag is set to 1).

Explicit-Null label is not set (E-flag is set to 0).

Command Modes

IS-IS interface address-family configuration

OSPF interface configuration

Command History

Release

Modification

Release 6.1.2

This command was introduced.

Release 6.2.1

The strict-spf keyword was added for IS-IS.

Usage Guidelines

Segment routing must be configured on the ISIS instance or on the OSPF process, area, or interface before configuring prefix SID value.

Strict-SPF SIDs are used to forward traffic strictly along the SPF path. Strict-SPF SIDs are not forwarded to SR-TE policies. IS-IS advertises the SR Algorithm sub Type Length Value (TLV) (in the SR Router Capability SubTLV) to include both algorithm 0 (SPF) and algorithm 1 (Strict-SPF). When the IS-IS area or level is Strict-SPF TE-capable, Strict-SPF SIDs are used to build the SR-TE Strict-SPF policies. Strict-SPF SIDs are also used to program the backup paths for prefixes, node SIDs, and adjacency SIDs.


Note
The same SRGB is used for both regular SIDs and strict-SPF SIDs.

Task ID

Task ID

Operations

isis

ospf

read, write

Examples

This example shows how to configure a prefix SID. 


RP/0/RSP0/CPU0:router # configure
RP/0/RSP0/CPU0:router(config)# router isis 100
RP/0/RSP0/CPU0:router(config-isis)# interface loopback0
RP/0/RSP0/CPU0:router(config-isis-if)# address-family ipv4 unicast
RP/0/RSP0/CPU0:router(config-isis-if-af)# prefix-sid index 1001

This example shows how to configure an absolute prefix SID on an OSPF interface.


RP/0/RSP0/CPU0:router # configure
RP/0/RSP0/CPU0:router(config)# router ospf 1
RP/0/RSP0/CPU0:router(config-ospf)# router area 0
RP/0/RSP0/CPU0:router(config-ospf-ar)# interface loopback0
RP/0/RSP0/CPU0:router(config-ospf-ar-if)# prefix-sid absolute 16041

Related Commands

Command

Description

segment-routing global-block

Configures the segment routing global block (SRGB).

prefix-unreachable

Use this command for UPA advertisements by enabling individual control parameters.

The new prefix-unreachable command under IS-IS address-family submode includes several command-options that control various parameters for UPAs originated by the router.

prefix-unreachable { adv-lifetime <value> | adv-metric <value> | adv-maximum <value> | rx-process-enable }

Syntax Description

Keyword

Details
prefix-unreachable

Lists the control options of UPA.
adv-lifetime

  • This command is optional.

  • Amount of time the UPA will be advertised after the prefix becomes unreachable.

    Range of values is 30–65535 seconds.

  • Default value is 180 seconds.
adv-metric

  • This command is optional.

  • Metric used when advertising UPA.

    Range of values is 4261412865–4294967294 (0xFE000001 to 0xFFFFFFFE).

  • Default value is 4261412865 (0xFE000001).
adv-maximum

  • This command is optional.

    UPAs that are leaked or propagated are not counted against this limit.

  • Maximum number of UPAs that the router is allowed to generate to any of its attached areas or domains. UPAs that are leaked, propagate, or redistributed are not counted against this limit.

    Range of values is 1–65535.

  • Default value is 32.
rx-process-enable

  • This command is optional.

  • If enabled, the UPA received by the router is sent to RIB and is used to trigger the BGP PIC.

  • It is disabled by default.

Command Default

None.

Command Modes

IS-IS interface address-family configuration

Command History

Release

Modification

Release 7.8.1

This command was introduced.

Task ID

Task ID

Operations

IS-IS

read, write

Examples

This example shows how to configure UPA. 


Router(config)#router isis 1
Router(config-isis)#address-family ipv6 un
Router(config-isis-af)#prefix-unreachable 
Router(config-isis-prefix-unreachable)#adv-lifetime 500
Router(config-isis-prefix-unreachable)#adv-metric 4261412866
Router(config-isis-prefix-unreachable)#adv-maximum 77
Router(config-isis-prefix-unreachable)#rx-process-enable 
Router(config-isis-prefix-unreachable)#commit

summary-prefix

Use the exiting summary-prefix command for UPA advertisement.

summary-prefix prefix/mask level 1or 2 [ tag value ][ adv-unreachable { unreachable-component-tag value partition-repair }]

Syntax Description

Keyword

Details
level1or 2

Enter the border router values 1 or 2. To set the border router level for UPA.
tagvalue

Enter the tag value for which you want to enable the UPA.
adv-unreachable

The new keyword adv-unreachable controls the UPA advertisement for the components of the summary.

The new adv-unreachable keyword is optional and disabled by default.

unreachable-component-tagvalue

The unreachable-component-tag is used to limit UPAs to those components of the summary that are advertised with a specific tag value.

The unreachable-component-tag keyword is disabled by default and UPA is generated for all components of the summary if enabled by the adv-unreachable keyword.

partition-repair

In case the area (domain) partition is detected, the summary is suppressed, and more specific prefixes are advertised.

Command Default

None.

Command Modes

IS-IS address-family configuration

Command History

Release

Modification

Release 7.10.1

The partition-repair keyword was introduced.

Release 7.8.1

This command was introduced.

Usage Guidelines

New commands are added under the exiting IS-IS address-family sub-mode summary-prefix command.

Task ID

Task ID

Operations

IS-IS

read, write

Examples

This example shows how to configure Summary-Prefix for UPA. 


Router(config)#router isis 1
Router(config)#router isis 1
Router(config-isis)#address-family ipv6 unicast 
Router(config-isis-af)#router-id 2001:DB8:4::4
Router(config-isis-af)#summary-prefix 2001:DB8::/32 level 2 partition-repair 
Router(config-isis-af)#summary-prefix 2001:DB9::/32 level 2 algorithm 128 partition-repair

segment-routing global-block

To configure the segment routing global block (SRGB), use the segment-routing global-block command.

segment-routing global-block starting_value ending_value

Syntax Description

starting_value ending_value

Specifies the block of segment routing IDs that are allocated for the routers in the network. Ranges from 16000 to 1048574.

Command Default

Default SRGB range is 16000 to 23999.

Command Modes

Global Configuration mode

Command History

Release

Modification

Release 6.1.2

This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

To keep the segment routing configuration simple and to make it easier to troubleshoot segment routing issues, we recommend that you use the default SRGB range on each node in the domain. However, there are instances when you might need to define a different range:

  • The nodes of another vendor support a label range that is different from the default SRGB, and you want to use the same SRGB on all nodes.

  • The default range is too small.

  • To specify separate SRGBs for IS-IS and OSPF protocols, as long as the ranges do not overlap.

Because the values assigned from the range have domain-wide significance, we recommend that all routers within the domain be configured with the same range of values.

Task ID

Task ID Operation

mpls-te

read, write

Examples

This example shows how to configure the SRGB range:


RP/0/RSP0/CPU0:router(config)# segment-routing global-block 17000 20000

Related Commands

Command

Description

prefix-sid

Configures the segment ID (SID).

segment-routing local-block

To configure the segment routing local block (SRLB), use the segment-routing local-block command.

segment-routing local-block starting_value ending_value

Syntax Description

starting_value ending_value

Specifies the block of labels that are reserved for manual allocation of adjacency segment IDs (Adj-SIDs). Ranges from 15000 to 1048574.

Command Default

Default SRLB range is 15000 to 15999.

Command Modes

Global Configuration mode

Command History

Release

Modification

Release 6.3.1

This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

When you define a new SRLB range, there might be a label conflict (for example, if labels are already allocated, statically or dynamically, in the new SRLB range). In this case, the new SRLB range will be accepted, but not applied (pending). The previous SRLB range (active) will continue to be in use until one of the following occurs:

  • Reload the router to release the currently allocated labels and allocate the new SRLB

  • Use the clear segment-routing local-block discrepancy all command to clear the label conflicts

The SRLB size cannot be more than 262,143.

To keep the segment routing configuration simple and to make it easier to troubleshoot segment routing issues, we recommend that you use the default SRLB range on each node in the domain. However, there are instances when you might need to define a different range:

  • The nodes of another vendor support a label range that is different from the default SRLB, and you want to use the same SRLB on all nodes.

  • The default range is too small.

Because the values assigned from the range have domain-wide significance, we recommend that all routers within the domain be configured with the same range of values.

Task ID

Task ID Operation

mpls-te

read, write

Examples

This example shows how to configure the SRLB range:


RP/0/RSP0/CPU0:router(config)# segment-routing local-block 18000 19999

Related Commands

Command

Description

clear segment-routing local-block discrepancy all

Clears SRLB label conflicts

show segment-routing local-block inconsistencies

Displays SRLB label conflicts

segment-routing mapping-server

To configure the segment routing mapping server (SRMS), use the segment-routing mapping-server command.

segment-routing mapping-server prefix-sid-map address-family{ ipv4 | ipv6} ip_address/ subnet_mask SID_start_value range range

Syntax Description

address-family{ ipv4 | ipv6}

Configures the address family for IS-IS.
ip_address/ subnet_mask

Specifies the prefix and mask.

SID_start_value

Specifies the first prefix SID in the range.

range range

Specifies the size of the range.

Command Default

None

Command Modes

Global Configuration mode

Command History

Release

Modification

Release 6.3.2

This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

The position of the mapping server in the network is not important. However, since the mapping advertisements are distributed in IGP using the regular IGP advertisement mechanism, the mapping server needs an IGP adjacency to the network.

The role of the mapping server is crucial. For redundancy purposes, you should configure multiple mapping servers in the networks.

Task ID

Task ID Operation

mpls-te

read, write

Examples

This example shows how to configure the mapping server and add prefix-SID mapping entries in the active local mapping policy:


RP/0/RSP0/CPU0:router(config)# segment-routing mapping-server prefix-sid-map address-family ipv4 10.1.1.1/32 17000 range 100

Related Commands

Command

Description

segment-routing prefix-sid-map advertise-local

Enables the router to advertise the SRMS entries that are locally configured.

segment-routing prefix-sid-map receive disable

Disables mapping client functionality.

show isis segment-routing prefix-sid-map

Displays the active and backup prefix-to-SID mappings for IS-IS.

show ospf segment-routing prefix-sid-map

Displays the active and backup prefix-to-SID mappings for OSPF.

show segment-routing mapping-server prefix-sid-map

Displays the locally configured prefix-to-SID mappings.

segment-routing mpls

To enable segment routing for IPv4 addresses with MPLS data plane, use the segment-routing mpls command in IPv4 address family configuration mode. To disable segment routing, use the no form of this command.

segment-routing mpls

Syntax Description

mpls

Enables segment routing for IPv4 addresses with MPLS data plane.

Command Default

No default behavior or values.

Command Modes

IPv4 address family configuration

Router configuration

Area configuration

Command History

Release

Modification

Release 6.1.2

This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

Task ID

Task ID Operation

mpls-te

read, write

Examples

This example shows how to enable segment routing with MPLS data plane.


RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router(config)# router isis 100
RP/0/RSP0/CPU0:router(config-isis)# address-family ipv4 unicast
RP/0/RSP0/CPU0:router(config-isis-af)# segment-routing mpls

segment-routing prefix-sid-map advertise-local

To enable the router to advertise the segment routing mapping server (SRMS) entries that are locally configured, use the segment-routing prefix-sid-map advertise-local command. In addition to advertising these local SRMS entries, these mapping entries are also used to calculate segment ID (SID).

segment-routing prefix-sid-map advertise-local

Syntax Description

advertise-local

Advertises the SRMS mapping entries that are locally configured.

Command Default

Disabled.

Command Modes

IPv4 address family configuration

Router configuration

Command History

Release

Modification

Release 6.3.2

This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

Task ID

Task ID Operation

ospf

isis

read, write

Examples

This example shows how to enable the router to advertise the locally configured SRMS entries:


RP/0/RSP0/CPU0:router# configure
RP/0/RSP0/CPU0:router(config)# router ospf 1
RP/0/RSP0/CPU0:router(config-ospf)# segment-routing prefix-sid-map advertise-local

Related Commands

Command

Description

segment-routing mapping-server

Configures the segment routing mapping server (SRMS).

segment-routing prefix-sid-map receive disable

Disables mapping client functionality.

show isis segment-routing prefix-sid-map

Displays the active and backup prefix-to-SID mappings for IS-IS.

show ospf segment-routing prefix-sid-map

Displays the active and backup prefix-to-SID mappings for OSPF.

show segment-routing mapping-server prefix-sid-map

Displays the locally configured prefix-to-SID mappings.

segment-routing prefix-sid-map receive disable

To disable mapping client functionality, use the segment-routing prefix-sid-map receive disable command. To reenable client functionality, use the segment-routing prefix-sid-map receive command.

segment-routing prefix-sid-map receive [ disable]

Syntax Description

receive

Only remote SRMS mapping entries are used for SID calculation.

disable

Disable remote SRMS mapping entries received by flooding.

Command Default

Enabled.

Command Modes

IPv4 address family configuration

Router configuration

Command History

Release

Modification

Release 6.3.2

This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

The mapping client functionality is enabled by default. When you disable client functionality, the SRMS active policy is calculated without remote SRMS entries.

You can use this command with the segment-routing prefix-sid-map advertise-local command simultaneously.

Task ID

Task ID Operation

ospf

isis

read, write

Examples

This example shows how to disable the mapping server client functionality:


RP/0/RSP0/CPU0:router(config)# router isis 1
RP/0/RSP0/CPU0:router(config-isis)# address-family ipv4 unicast
RP/0/RSP0/CPU0:router(config-isis-af)# segment-routing prefix-sid-map receive disable

Related Commands

Command

Description

segment-routing mapping-server

Configures the segment routing mapping server (SRMS).

segment-routing prefix-sid-map advertise-local

Enables the router to advertise the SRMS entries that are locally configured.

show isis segment-routing prefix-sid-map

Displays the active and backup prefix-to-SID mappings for IS-IS.

show ospf segment-routing prefix-sid-map

Displays the active and backup prefix-to-SID mappings for OSPF.

show segment-routing mapping-server prefix-sid-map

Displays the locally configured prefix-to-SID mappings.

segment-routing traffic-eng explicit

To detect the liveness of the reverse path of the segment list and the configure the segment list, use the segment-routing traffic-eng explicit command in performance measurement configuration mode. To disable the reverse path, use the no form of the command.

segment-routing traffic-eng explicit { reverse-path segment-list name segment-list-name | segment-list name segment-list-name reverse-path segment-list name segment-list-name }

Syntax Description

reverse-path

Specifes the return path on the endpoint for liveness detection.
segment-listname segment-list-name

Specifes the segment list on the endpoint for liveness detection and delay.

Command Default

None

Command Modes

Performance measurement endpoint submode

Command History

Release Modification
Release 24.1.1

This command was introduced.

Usage Guidelines

The default reverse path configured under endpoint submode is only used for sessions with segment list. The endpoint session without a segment list does not support reverse path configuration and will not use this reverse path.

The reverse-path under the performance-measurement endpoint is used as the default reverse path if there are no reverse paths configured under a segment list.

Use the reverse-path under the performance-measurement endpoint segment-routing traffic-eng explicit segment-list name fwd-path to configure reverse path under a segment list.

The reverse type must be the same as the forward path. Using different types for forward and reverse paths is not supported. For example, uSID forward path and uSID reverse path; MPLS forward path and MPLS reverse path.

User-configured segment-list can also represent the reverse path (reflector to sender) when probe is configured in liveness detection mode. Up to 128 segment-lists can be configured under a probe. An additional PM session is created for each segment-list. Segment-lists are configured under segment-routing traffic-eng segment-list submode. See SR-TE Policy with Explicit Path for details about configuring segment lists.

Examples

The following example shows how to configure liveness of the reverse path of the segment list:

The following example shows how to configure liveness reverse path under segment list and under endpoint:

Router(config)#performance-measurement
Router(config-perf-meas)#endpoint ipv6 ff::2

/* Configure reverse path segment-list with forward segment-list*\
Router(config-pm-ep)#segment-routing traffic-eng explicit segment-list name fwd-path
Router(config-pm-ep-sl)#reverse-path segment-list name rev-path
Router(config-pm-ep-sl)#exit

/* Configure reverse-path segment list on the endpoint*\
Router(config-pm-ep)# segment-routing traffic-eng explicit reverse-path segment-list name rev-path-name

show isis segment-routing prefix-sid-map

To verify the active and backup prefix-to-SID mappings for IS-IS, use the show isis segment-routing prefix-sid-map command.

show isis segment-routing prefix-sid-map [ active-policy | backup-policy]

Syntax Description

active-policy

(Optional) Specifies the active mapping policy.

backup-policy

(Optional) Specifies the backup mapping policy.

Command Default

None

Command Modes

EXEC

Command History

Release

Modification

Release 6.3.2

This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

Task ID

Task ID Operation

isis

read

Examples

The example shows how to verify the active mapping policy on IS-IS:


RP/0/0/CPU0:router# show isis segment-routing prefix-sid-map active-policy

IS-IS 1 active policy
Prefix               SID Index    Range        Flags
1.1.1.100/32         100          20          
1.1.1.150/32         150          10          

Number of mapping entries: 2

The example shows how to verify the backup mapping policy on IS-IS:


RP/0/0/CPU0:router# show isis segment-routing prefix-sid-map backup-policy

IS-IS 1 backup policy
Prefix               SID Index    Range        Flags
1.1.1.100/32         100          20          
1.1.1.150/32         150          10          

Number of mapping entries: 2

Related Commands

Command

Description

segment-routing mapping-server

Configures the segment routing mapping server (SRMS).

segment-routing prefix-sid-map advertise-local

Enables the router to advertise the SRMS entries that are locally configured.

segment-routing prefix-sid-map receive disable

Disables mapping client functionality.

show ospf segment-routing prefix-sid-map

Displays the active and backup prefix-to-SID mappings for OSPF.

show segment-routing mapping-server prefix-sid-map

Displays the locally configured prefix-to-SID mappings.

show mvpn vrf

To view BGP MVPN configuration information for a VRF, use the show mvpn vrf command in EXEC mode.

show mvpn vrf name { context [ detail ] | database segment-routing | pe [ address ] }

Syntax Description

vrf name

Specifies the VRF for which BGP MVPN information is displayed.

context [detail]

Specifies that MVPN information including MDT, Route Distinguisher and Route Target details be displayed.

database segment-routing

Specifies that MDT database information be displayed.

pe [address]

Specifies the ingress or egress PE router for which MVPN information is to be displayed.

Command Default

None

Command Modes

EXEC

Command History

Release Modification

Release 7.3.1

This command was introduced.

Examples

View Default MDT Configuration Information

This command displays SR multicast tree information, including the MDT details (of Default type, etc), and customer VRF information (route target, route distinguisher, etc). 

Router# show mvpn vrf vpn1 context    

MVPN context information for VRF vpn1 (0x9541cf0)

RD: 1:10 (Valid, IID 0x1), VPN-ID: 0:0
Import Route-targets : 2
  RT:192.168.0.4:0, BGP-AD
  RT:192.168.0.4:17, BGP-AD
BGP Auto-Discovery Enabled (I-PMSI added) 
SR P2MP Core-tree data:
  MDT Name: TRmdtvpn1, Handle: 0x4150, idb: 0x956fc30
  MTU: 1376, MaxAggr: 255, SW_Int: 30, AN_Int: 60
  RPF-ID: 3, C:0, O:1, D:0, CP:0
  Static Type : - / - 
  Def MDT ID: 524289 (0x93993f0), added: 1, HLI: 0x80001, Cfg: 1/0
  Part MDT ID: 0 (0x0), added: 0, HLI: 0x00000, Cfg: 0/0
  Ctrl Trees : 0/0/0, Ctrl ID: 0 (0x0), Ctrl HLI: 0x00000

View Partitioned MDT Configuration Information

This command displays SR multicast tree information, including the MDT details (of Partitioned type, etc), and customer VRF information (route target, route distinguisher, etc). 

Router# show mvpn vrf vpn1 context 

MVPN context information for VRF vpn1 (0x9541cf0)

RD: 1:10 (Valid, IID 0x1), VPN-ID: 0:0
Import Route-targets : 2
  RT:192.168.0.4:0, BGP-AD
  RT:192.168.0.4:17, BGP-AD
BGP Auto-Discovery Enabled (I-PMSI added) , MS-PMSI sent
SR P2MP Core-tree data:
  MDT Name: TRmdtvpn1, Handle: 0x4210, idb: 0x956fc30
  MTU: 1376, MaxAggr: 255, SW_Int: 30, AN_Int: 60
  RPF-ID: 1, C:0, O:1, D:0, CP:0
  Static Type : - / - 
  Def MDT ID: 0 (0x0), added: 0, HLI: 0x00000, Cfg: 0/0
  Part MDT ID: 524292 (0x9399318), added: 1, HLI: 0x80004, Cfg: 1/0
  Ctrl Trees : 0/0/0, Ctrl ID: 0 (0x0), Ctrl HLI: 0x00000

View MDT Configuration Information On The Ingress PE Router

This command displays SR multicast tree information on the PE router that receives the multicast traffic on the SP network. The information includes PE router details, MDT details, Tree-SID details, and the specified customer VRF information. 

Router# show mvpn vrf vpn1 pe 

MVPN Provider Edge Router information

VRF : vpn1

PE Address : 192.168.0.3 (0x9570240)
  RD: 0:0:0 (null), RIB_HLI 0, RPF-ID 13, Remote RPF-ID 0, State: 0, S-PMSI: 2
  PPMP_LABEL: 0, MS_PMSI_HLI: 0x00000, Bidir_PMSI_HLI: 0x00000, MLDP-added: [RD 0, ID 0, Bidir ID 0, Remote Bidir ID 0], Counts(SHR/SRC/DM/DEF-MD): 0, 0, 0, 0, Bidir: GRE RP Count 0, MPLS RP Count 0RSVP-TE added: [Leg 0, Ctrl Leg 0, Part tail 0 Def Tail 0, IR added: [Def Leg 0, Ctrl Leg 0, Part Leg 0, Part tail 0, Part IR Tail Label 0
  Tree-SID Added: [Def/Part Leaf 1, Def Egress 0, Part Egress 0, Ctrl Leaf 0]
  bgp_i_pmsi: 1,0/0 , bgp_ms_pmsi/Leaf-ad: 1/1, bgp_bidir_pmsi: 0, remote_bgp_bidir_pmsi: 0, PMSIs: I 0x9570378, 0x0, MS 0x94e29d0, Bidir Local: 0x0, Remote: 0x0, BSR/Leaf-ad 0x0/0, Autorp-disc/Leaf-ad 0x0/0, Autorp-ann/Leaf-ad 0x0/0
 IIDs: I/6: 0x1/0x0, B/R: 0x0/0x0, MS: 0x1, B/A/A: 0x0/0x0/0x0

  Bidir RPF-ID: 14, Remote Bidir RPF-ID: 0
  I-PMSI:   Unknown/None (0x9570378)
  I-PMSI rem:  (0x0)
  MS-PMSI:   Tree-SID [524290, 192.168.0.3] (0x94e29d0)
  Bidir-PMSI:  (0x0)
  Remote Bidir-PMSI:  (0x0)
  BSR-PMSI:  (0x0)
  A-Disc-PMSI:  (0x0)
  A-Ann-PMSI:  (0x0)
  RIB Dependency List: 0x0
  Bidir RIB Dependency List: 0x0
    Sources: 0, RPs: 0, Bidir RPs: 0

View MDT Configuration Information On The Egress PE Router

This command displays SR multicast tree information on the MVPN egress PE router that sends multicast traffic from the SP network towards multicast receivers. The information includes PE router, Tree-SID, MDT, and the specified customer VRF details. 

Router# show mvpn vrf vpn1 pe

MVPN Provider Edge Router information

PE Address : 192.168.0.4 (0x9fa38f8)
  RD: 1:10 (valid), RIB_HLI 0, RPF-ID 15, Remote RPF-ID 0, State: 1, S-PMSI: 2
  PPMP_LABEL: 0, MS_PMSI_HLI: 0x00000, Bidir_PMSI_HLI: 0x00000, MLDP-added: [RD 0, ID 0, Bidir ID 0, Remote Bidir ID 0], Counts(SHR/SRC/DM/DEF-MD): 1, 1, 0, 0, Bidir: GRE RP Count 0, MPLS RP Count 0RSVP-TE added: [Leg 0, Ctrl Leg 0, Part tail 0 Def Tail 0, IR added: [Def Leg 0, Ctrl Leg 0, Part Leg 0, Part tail 0, Part IR Tail Label 0
  Tree-SID Added: [Def/Part Leaf 0, Def Egress 0, Part Egress 1, Ctrl Leaf 0]
  bgp_i_pmsi: 1,0/0 , bgp_ms_pmsi/Leaf-ad: 1/0, bgp_bidir_pmsi: 0, remote_bgp_bidir_pmsi: 0, PMSIs: I 0x9f77388, 0x0, MS 0x9fa2f98, Bidir Local: 0x0, Remote: 0x0, BSR/Leaf-ad 0x0/0, Autorp-disc/Leaf-ad 0x0/0, Autorp-ann/Leaf-ad 0x0/0
 IIDs: I/6: 0x1/0x0, B/R: 0x0/0x0, MS: 0x1, B/A/A: 0x0/0x0/0x0

  Bidir RPF-ID: 16, Remote Bidir RPF-ID: 0
  I-PMSI:   Unknown/None (0x9f77388)
  I-PMSI rem:  (0x0)
  MS-PMSI:   Tree-SID [524292, 192.168.0.4] (0x9fa2f98)
  Bidir-PMSI:  (0x0)
  Remote Bidir-PMSI:  (0x0)
  BSR-PMSI:  (0x0)
  A-Disc-PMSI:  (0x0)
  A-Ann-PMSI:  (0x0)
  RIB Dependency List: 0x9f81370
  Bidir RIB Dependency List: 0x0
    Sources: 1, RPs: 1, Bidir RPs: 0

View Default or Partitioned MDT Database

Router# show mvpn vrf vpn1 database segment-routing

Core Type    Core Source        Tree Core        State  On-demand Color 
                                Information 

Default           0.0.0.0            0 (0x00000)  Down   10
Part          192.168.0.4       524292 (0x80004)    Up   10
  Leaf AD Leg:  192.168.0.3
Control       192.168.0.4            0 (0x00000)  Down   10

show mrib nsf private

To display the state of nonstop forwarding (NSF) operation in the Multicast Routing Information Base (MRIB), use the show mrib nsf private command in the appropriate mode.

show mrib nsf private

Syntax Description

show mrib nsf private

Displays the state of NSF operation in the MRIB.

Command Default

None

Command Modes

XR EXEC mode

Table 3. Release History

Release

Modification
Release 7.10.1

This command was modified.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

The show mrib nsf command displays the current multicast NSF state for the MRIB. The state may be normal or activated for NSF. The activated state indicates that recovery is in progress due to a failure in MRIB or Protocol Independent Multicast (PIM). The total NSF timeout and time remaining are displayed until NSF expiration.

Table 4. Task ID

Release

Modification

multicast

read

Examples

The example shows how to verify the Non Stop Forwarding:


Router#show mrib nsf private 
Mon Jul 31 13:27:05.056 UTC
IP MRIB Non-Stop Forwarding Status:
Multicast routing state: Normal
   NSF Lifetime:       00:03:00
   Respawn Count: 6
   Last NSF On triggered: Tue Jul 25 13:20:49 2023, 6d00h
   Last NSF Off triggered: Tue Jul 25 13:22:49 2023, 6d00h
   Last NSF ICD Notification sent: Tue Jul 25 13:22:49 2023, 6d00h
   Last Remote NSF On triggered: Tue Jul 25 13:10:18 2023, 6d00h
   Last Remote NSF Off triggered: Tue Jul 25 13:10:27 2023, 6d00h
   Last Label TE NSF On triggered: Tue Jul 25 13:10:18 2023, 6d00h
   Last Label TE NSF Off triggered: Tue Jul 25 13:10:27 2023, 6d00h
   Last Label mLDP NSF On triggered: Tue Jul 25 13:10:18 2023, 6d00h
   Last Label mLDP NSF Off triggered: Tue Jul 25 13:10:27 2023, 6d00h
   Last Label PIM NSF On triggered: Tue Jul 25 13:20:49 2023, 6d00h
   Last Label PIM NSF Off triggered: Tue Jul 25 13:22:49 2023, 6d00h
   Last Label PIM6 NSF On triggered: Tue Jul 25 13:31:22 2023, 5d23h
   Last Label PIM6 NSF Off triggered: Tue Jul 25 13:33:22 2023, 5d23h
   Last Label XTC NSF On triggered: Tue Jul 25 13:41:51 2023, 5d23h
   Last Label XTC NSF Off triggered: Tue Jul 25 13:41:52 2023, 5d23h

IP NSF :- Active: N, Assume N
MRIB connect timer: Inactive
NSF statistics:
   Enabled Cnt - 4, Disabled Cnt - 4
   Last Enabled: 6d00h, Last Disabled: 6d00h
Multicast COFO routing state: Normal
Current LMRIB clients: LDP RSVP_TE PIM PIM6 XTC 
LMRIB NSF clients: LDP RSVP_TE PIM PIM6 XTC 
Converged LMRIB clients: LDP RSVP_TE PIM PIM6 XTC 
RP/0/RSP0/CPU0:tb8-R2#

show ospf routes flex-algo

To display the OSPF routing table for flexible algorithm, use the show ospf routes flex-algo command in the EXEC mode.

show ospf routes flex-algo [number] [ IP prefix / prefix_len | route-type { external | inter | intra } ] [backup-path] [detail]

Syntax Description

number

Specifies the flexible algorithm number. The range is from 128 to 255.
IP prefix/prefix_len

Specifies IP address along with the subnet mask.
backup-path

Displays the backup-path information of the OSPF routes.
detail

Displays the detailed information of the OSPF routes.

route-type external

Displays OSPF external routes.

route-type inter

Display OSPF inter area routes.

route-type intra

Displays OSPF intra area routes.

Command Default

None

Command Modes

EXEC mode

Command History

Release Modification
Release 7.5.1

This command was introduced.

Usage Guidelines

Use the show ospf routes flex-algo command to display the OSPF private routing table for flexible algorithm (which contains only flexible algorithm routes calculated by OSPF). If there is something wrong with a route in the MPLS forwarding table and RIB, then it is useful to check the OSPF copy of the route to determine if it matches the RIB and MPLS forwarding entries. If it does not match, there is a synchronization problem between OSPF and the MPLS. If the routes match and the route is incorrect, OSPF has made an error in its routing calculation.

Examples

This following show output displays the external route type configured:


Router#show ospf routes flex-algo 240 route-type external detail 
Route Table of ospf-1 with router ID 192.168.0.2 (VRF default)
 
  Algorithm 240
 
  Route entry for 192.168.4.3/32, Metric 220, SID 536, Label 16536
   Priority : Medium
 
     Route type : Extern Type 1     
Last updated : Apr 25 14:30:12.718
     Flags: Inuse
 
     Prefix Contrib Algo 240 SID 536
      From 192.168.0.4 Route-type 5
      Total Metric : 220 Base metric 20 FAPM 20
      Contrib Flags : Inuse, Reachable
      SID Flags : PHP off, Index, Global, Valid
 
      Path: 10.1.1.3, from 192.168.0.4, via GigabitEthernet0/2/0/2
       Out Label  : 16536
       Weight     : 0
       Area       : 0
 
      Path: 10.1.2.3, from 192.168.0.4, via GigabitEthernet0/2/0/3
       Out Label  : 16536
       Weight     : 0
       Area       : 0
 
      Path: 10.2.1.5, from 192.168.0.4, via GigabitEthernet0/2/0/4
       Out Label  : 16536
       Weight     : 0
       Area       : 0
 
  Route entry for 192.168.4.5/32, Metric 120, SID 556, Label 16556
   Priority : Medium
 
     Route type : Extern Type 1
     Last updated : Apr 25 14:30:12.724
     Flags: Inuse
 
     Prefix Contrib Algo 240 SID 556
      From 192.168.0.3 Route-type 5
      Total Metric : 120 Base metric 1 FAPM 20
      Contrib Flags : Inuse, Reachable
      SID Flags : PHP off, Index, Global, Valid
 
      Path: 10.1.1.3, from 192.168.0.3, via GigabitEthernet0/2/0/2
       Out Label  : 16556
       Weight     : 0
       Area       : 0
 
      Path: 10.1.2.3, from 192.168.0.3, via GigabitEthernet0/2/0/3
       Out Label  : 16556
       Weight     : 0
       Area       : 0

The following show output displays label information for flexible algorithm and its corresponding metric as added in RIB: 

RP/0/RP0/CPU0:ios# show route 192.168.0.2/32 detail
Wed Apr  6 16:24:46.021 IST
 
Routing entry for 192.168.0.2/32
  Known via "ospf 1", distance 110, metric 2, labeled SR, type intra area
  Installed Apr  6 15:51:57.973 for 00:32:48
  Routing Descriptor Blocks
    10.10.10.2, from 192.168.0.2, via GigabitEthernet0/2/0/0, Protected
      Route metric is 2
      Label: 0x3 (3)
      Tunnel ID: None
      Binding Label: None
      Extended communities count: 0
      Path id:1       Path ref count:0
      NHID:0x1(Ref:1)
      Backup path id:65
      OSPF area: 1
    10.11.11.2, from 192.168.0.2, via GigabitEthernet0/2/0/1, Backup (Local-LFA)
      Route metric is 6
      Label: 0x3 (3)
      Tunnel ID: None
      Binding Label: None
      Extended communities count: 0
      Path id:65              Path ref count:1
      NHID:0x2(Ref:1)
      OSPF area:
  Route version is 0x12 (18)
  Local Label: 0x3ee6 (16102)
  Local Label Algo Set (ID, Label, Metric): (1, 16202, 0),(128, 17282, 2)
  IP Precedence: Not Set
  QoS Group ID: Not Set
  Flow-tag: Not Set
  Fwd-class: Not Set
  Route Priority: RIB_PRIORITY_NON_RECURSIVE_MEDIUM (7) SVD Type RIB_SVD_TYPE_LOCAL
  Download Priority 1, Download Version 38
  No advertising protos.

The following example shows the backup path for each path:


Router#show ospf routes flex-algo 240 route-type external backup-path  
    
 
Route Table of ospf-1 with router ID 192.168.0.2 (VRF default)
 
  Algorithm 240
 
  192.168.4.3/32, Metric 220, SID 536, Label 16536
      10.1.1.3, from 192.168.0.4, via GigabitEthernet0/2/0/2
           Backup path:
              10.23.2.3, from 192.168.0.4, via GigabitEthernet0/2/0/3,
              Out Label: 16536
              Attributes: Metric: 220, Primary , Downstream, Interface Disjoint, SRLG Disjoint
      10.1.2.3, from 192.168.0.4, via GigabitEthernet0/2/0/3
           Backup path:
              10.23.1.3, from 192.168.0.4, via GigabitEthernet0/2/0/2,
              Out Label: 16536
              Attributes: Metric: 220, Primary , Downstream, Interface Disjoint, SRLG Disjoint
      10.1.1.5, from 192.168.0.4, via GigabitEthernet0/2/0/4
           Backup path:
              10.23.1.3, from 192.168.0.4, via GigabitEthernet0/2/0/2,
              Out Label: 16536
              Attributes: Metric: 220, Primary , Downstream, Node Protect, Interface Disjoint, SRLG Disjoint
  192.168.4.5/32, Metric 120, SID 556, Label 16556
      10.1.1.3, from 192.168.0.3, via GigabitEthernet0/2/0/2
           Backup path:
              10.23.2.3, from 192.168.0.3, via GigabitEthernet0/2/0/3,
              Out Label: 16556
              Attributes: Metric: 120, Primary , Downstream, Interface Disjoint, SRLG Disjoint
      10.1.2.3, from 192.168.0.3, via GigabitEthernet0/2/0/3
           Backup path:
              10.1.1.3, from 192.168.0.3, via GigabitEthernet0/2/0/2,
              Out Label: 16556
              Attributes: Metric: 120, Primary , Downstream, Interface Disjoint, SRLG Disjoint

The following example shows details of the route, but not the backup paths:


Router#show ospf routes flex-algo 240 route-type external detail   
   
Route Table of ospf-1 with router ID 192.168.0.2 (VRF default)
 
  Algorithm 240
 
  Route entry for 192.168.4.3/32, Metric 220, SID 536, Label 16536
   Priority : Medium
 
     Route type : Extern Type 1
     Last updated : Apr 25 14:30:12.718
     Flags: Inuse
 
     Prefix Contrib Algo 240 SID 536
      From 192.168.0.4 Route-type 5
      Total Metric : 220 Base metric 20 FAPM 20
      Contrib Flags : Inuse, Reachable
      SID Flags : PHP off, Index, Global, Valid
 
      Path: 10.1.1.3, from 192.168.0.4, via GigabitEthernet0/2/0/2
       Out Label  : 16536
       Weight     : 0
       Area       : 0
 
      Path: 10.1.2.3, from 192.168.0.4, via GigabitEthernet0/2/0/3
       Out Label  : 16536
       Weight     : 0
       Area       : 0
 
      Path: 10.2.1.5, from 192.168.0.4, via GigabitEthernet0/2/0/4
       Out Label  : 16536
       Weight     : 0
       Area       : 0
 
  Route entry for 192.168.4.5/32, Metric 120, SID 556, Label 16556
   Priority : Medium
 
     Route type : Extern Type 1
     Last updated : Apr 25 14:30:12.724
     Flags: Inuse
 
     Prefix Contrib Algo 240 SID 556
      From 192.168.0.3 Route-type 5
      Total Metric : 120 Base metric 1 FAPM 20
      Contrib Flags : Inuse, Reachable
      SID Flags : PHP off, Index, Global, Valid
 
      Path: 10.1.1.3, from 192.168.0.3, via GigabitEthernet0/2/0/2
       Out Label  : 16556
       Weight     : 0
       Area       : 0
 
      Path: 10.1.2.3, from 192.168.0.3, via GigabitEthernet0/2/0/3
       Out Label  : 16556
       Weight     : 0
       Area       : 0

The following example shows details of the route and backup paths:


Router#show ospf routes flex-algo 240 route-type external backup-path detail 
  
Route Table of ospf-1 with router ID 192.168.0.2 (VRF default)
 
  Algorithm 240
 
  Route entry for 192.168.4.3/32, Metric 220, SID 536, Label 16536
   Priority : Medium
 
     Route type : Extern Type 1
     Last updated : Apr 25 14:30:12.718
     Flags: Inuse
 
     Prefix Contrib Algo 240 SID 536
      From 192.168.0.4 Route-type 5
      Total Metric : 220 Base metric 20 FAPM 20
      Contrib Flags : Inuse, Reachable
      SID Flags : PHP off, Index, Global, Valid
 
      Path: 10.1.1.3, from 192.168.0.4, via GigabitEthernet0/2/0/2
       Out Label  : 16536
       Weight     : 0
       Area       : 0
 
           Backup path:
              10.1.2.3, from 192.168.0.4, via GigabitEthernet0/2/0/3,
              Out Label: 16536
              Attributes: Metric: 220, Primary , Downstream, Interface Disjoint, SRLG Disjoint
 
      Path: 23.23.2.3, from 192.168.0.4, via GigabitEthernet0/2/0/3
       Out Label  : 16536
       Weight     : 0
       Area       : 0
 
           Backup path:
              10.1.1.3, from 192.168.0.4, via GigabitEthernet0/2/0/2,
              Out Label: 16536
              Attributes: Metric: 220, Primary , Downstream, Interface Disjoint, SRLG Disjoint
 
      Path: 25.25.1.5, from 192.168.0.4, via GigabitEthernet0/2/0/4
       Out Label  : 16536
       Weight     : 0
       Area       : 0
 
           Backup path:
              10.1.1.3, from 192.168.0.4, via GigabitEthernet0/2/0/2,
              Out Label: 16536
              Attributes: Metric: 220, Primary , Downstream, Node Protect, Interface Disjoint, SRLG Disjoint
 
  Route entry for 192.168.4.5/32, Metric 120, SID 556, Label 16556
   Priority : Medium
 
     Route type : Extern Type 1
     Last updated : Apr 25 14:30:12.724
     Flags: Inuse
 
     Prefix Contrib Algo 240 SID 556
      From 192.168.0.3 Route-type 5
      Total Metric : 120 Base metric 1 FAPM 20
      Contrib Flags : Inuse, Reachable
      SID Flags : PHP off, Index, Global, Valid
 
      Path: 10.1.1.3, from 192.168.0.3, via GigabitEthernet0/2/0/2
       Out Label  : 16556
       Weight     : 0
       Area       : 0
 
           Backup path:
              10.1.2.3, from 192.168.0.3, via GigabitEthernet0/2/0/3,
              Out Label: 16556
              Attributes: Metric: 120, Primary , Downstream, Interface Disjoint, SRLG Disjoint
 
      Path: 10.1.2.3, from 192.168.0.3, via GigabitEthernet0/2/0/3
       Out Label  : 16556
       Weight     : 0
       Area       : 0
 
           Backup path:
              10.1.1.3, from 192.168.0.3, via GigabitEthernet0/2/0/2,
              Out Label: 16556
              Attributes: Metric: 120, Primary , Downstream, Interface Disjoint, SRLG Disjoint

show ospf segment-routing prefix-sid-map

To verify the active and backup prefix-to-SID mappings for OSPF, use the show ospf segment-routing prefix-sid-map command.

show ospf segment-routing prefix-sid-map [ active-policy | backup-policy]

Syntax Description

active-policy

(Optional) Specifies the active mapping policy.

backup-policy

(Optional) Specifies the backup mapping policy.

Command Default

None

Command Modes

EXEC

Command History

Release

Modification

Release 6.3.2

This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

Task ID

Task ID Operation

ospf

read

Examples

The example shows how to verify the active mapping policy on OSPF:


RP/0/0/CPU0:router# show ospf segment-routing prefix-sid-map active-policy

        SRMS active policy for Process ID 1

Prefix               SID Index    Range        Flags
1.1.1.100/32         100          20          
1.1.1.150/32         150          10           

Number of mapping entries: 2

The example shows how to verify the backup mapping policy on OSPF:


RP/0/0/CPU0:router# show ospf segment-routing prefix-sid-map backup-policy

        SRMS backup policy for Process ID 1

Prefix               SID Index    Range        Flags
1.1.1.100/32         100          20          
1.1.1.150/32         150          10          

Number of mapping entries: 2

Related Commands

Command

Description

segment-routing mapping-server

Configures the segment routing mapping server (SRMS).

segment-routing prefix-sid-map advertise-local

Enables the router to advertise the SRMS entries that are locally configured.

segment-routing prefix-sid-map receive disable

Disables mapping client functionality.

show isis segment-routing prefix-sid-map

Displays the active and backup prefix-to-SID mappings for IS-IS.

show segment-routing mapping-server prefix-sid-map

Displays the locally configured prefix-to-SID mappings.

show pce lsp p2mp

To view IP VPN multicast traffic details (such as LSP details) on the SR-PCE server, use the show pce lsp p2mp command in EXEC mode.

show pce lsp p2mp [ root ipv4 address ] [ tree-ID ]

Syntax Description

root ipv4 address

(Optional) The multicast tree’s root router IP address. Information will be displayed for the specified router.

tree-ID

(Optional) Multicast tree SID used (by multicast routers and the SR-PCE server) for transporting the IP VPN multicast traffic.

Information will be displayed for the specified Tree-SID.

Command Default

None

Command Modes

EXEC

Command History

Release Modification

Release 7.3.1

This command was introduced.

Examples

The following example shows how to view IP VPN multicast traffic details on the SR-PCE server. The routes are created and managed by the SR-PCE server.

View SR-PCE Multicast Tree Configuration Information 

Router# show pce lsp p2mp 

Tree: sr_p2mp_root_192.168.0.1_tree_id_524290
 Label:    18000     Operational: up  Admin: up
 Metric Type: TE
 Transition count: 3
 Uptime: 00:00:03 (since Fri Jan 24 14:57:51 PST 2020)
 Source: 192.168.0.1
 Destinations: 192.168.0.4
 Nodes:
  Node[0]: 192.168.0.2 (rtrM)
   Role: Transit
   Hops:
    Incoming: 18000 CC-ID: 4
    Outgoing: 18000 CC-ID: 4 (17.17.17.4) [rtrR]
  Node[1]: 192.168.0.1 (rtrL1)
   Role: Ingress
   Hops:
    Incoming: 18000 CC-ID: 5
    Outgoing: 18000 CC-ID: 5 (12.12.12.2) [rtrM]
  Node[2]: 192.168.0.4 (rtrR)
   Role: Egress
   Hops:
    Incoming: 18000 CC-ID: 6

For dynamic SR multicast trees created for MVPN, the show command has filters to view root multicast router and Tree-ID information. When the root router is specified, all multicast trees from that root are displayed. When root and Tree-ID are specified, only the specified tree information is displayed. 

Router# show pce lsp  p2mp root ipv4 1.1.1.1 524289

Tree: sr_p2mp_root_1.1.1.1_tree_id_524289, Root: 1.1.1.1 ID: 524289 
 Label:    20000     Operational: up  Admin: up
 PCC: 1.1.1.1

 Local LFA FRR: Disabled
 Metric Type: TE
 Transition count: 11
 Uptime: 00:03:37 (since Mon May 11 12:53:33 PDT 2020)
 Destinations: 1.1.1.3, 1.1.1.4, 1.1.1.5
 Nodes:
  Node[0]: 1.1.1.1 (root1)
   Role: Ingress
   Hops:
    Incoming: 20000 CC-ID: 26
    Outgoing: 20000 CC-ID: 26 (192.168.114.4) [mid-4]
    Outgoing: 20000 CC-ID: 26 (192.168.112.2) [mid-2]
  Node[1]: 1.1.1.4 (mid-4)
   Role: Egress
   Hops:
    Incoming: 20000 CC-ID: 27
  Node[2]: 1.1.1.2 (mid-2)
   Role: Transit
   Hops:
    Incoming: 20000 CC-ID: 28
    Outgoing: 20000 CC-ID: 28 (192.168.123.3) [leaf-3]
    Outgoing: 20000 CC-ID: 28 (192.168.125.5) [leaf-5]
  Node[3]: 1.1.1.3 (leaf-3)
   Role: Egress
   Hops:
    Incoming: 20000 CC-ID: 29
  Node[4]: 1.1.1.5 (leaf-5)
   Role: Egress
   Hops:
    Incoming: 20000 CC-ID: 30

The following output shows that LFA FRR is enabled on the hop from rtrR to rtrM. Unlike typical multicast replication where the address displayed is the remote address on the link to a downstream router, the IP address 192.168.0.3 (displayed with an exclamation mark) is the router-ID of the downstream router rtrM. The output also displays the LFA FRR state for the multicast tree. 

Router# show pce lsp p2mp 

Tree: sr_p2mp_root_192.168.0.4_tree_id_524290 
 Label:    18000     Operational: up  Admin: up
 LFA FRR: Enabled
 Metric Type: TE
 Transition count: 1
 Uptime: 3d19h (since Thu Feb 13 13:43:40 PST 2020)
 Source: 192.168.0.4
 Destinations: 192.168.0.1, 192.168.0.2
 Nodes:
  Node[0]: 192.168.0.3 (rtrM)
   Role: Transit
   Hops:
    Incoming: 18000 CC-ID: 1
    Outgoing: 18000 CC-ID: 1 (12.12.12.1) [rtrL1]
    Outgoing: 18000 CC-ID: 1 (15.15.15.2) [rtrL2]
  Node[1]: 192.168.0.4 (rtrR)
   Role: Ingress
   Hops:
    Incoming: 18000 CC-ID: 2
    Outgoing: 18000 CC-ID: 2 (192.168.0.3!) [rtrM]
  Node[2]: 192.168.0.1 (rtrL1)
   Role: Egress
   Hops:
    Incoming: 18000 CC-ID: 3
  Node[3]: 192.168.0.2 (rtrL2)
   Role: Egress
   Hops:
    Incoming: 18000 CC-ID: 4

show performance-measurement history

To display the history for delay-measurement, use the performance-measurement history show command in XR EXEC mode.

show performance-measurement history { probe-computation | advertisement | aggregation } { interfaces | endpoint | rsvp-te | sr-policy }

Syntax Description

probe-computation

(Optional) Displays information for the delay metric computation result within each probe interval.

advertisement

(Optional) Displays information for the delay metric computation result within each advertisement interval.

aggregation

(Optional) Displays information for the delay metric computation result within each aggregation interval.

interface

(Optional) Displays information on the specified interface.

endpoint

(Optional) Displays information on the specified endpoint.

rsvp-te

(Optional) Displays information on the specified Resource Reservation Protocol - Traffic Engineering (RSVP-TE).

sr-policy

(Optional) Displays information on the specified sr-policy.

Command Default

No default

Command Modes

XR EXEC

Command History

Release Modification
Release 24.1.1

This command was updated with synthetic and anomaly loss information.
Release 7.3.1

This command was introduced.

Task ID

Task ID Operation

performance-measurement

write/read

Examples


Router# show performance-measurement history probe-computation interfaces
Interface Name: GigabitEthernet0/2/0/0 (ifh: 0x1000020)
Delay-Measurement history (uSec):
  Probe Start Timestamp     Pkt(TX/RX)   Average       Min       Max
  Aug 01 2023 08:04:15.230       10/10       704       651       779


Router# show performance-measurement history probe-computation endpoint
Endpoint name: IPv4-192.168.0.4-vrf-default
  …
  Segment-List              : None
    Delay-Measurement history (uSec):
      Probe Start Timestamp     Pkt(TX/RX)   Average       Min       Max
      Aug 01 2023 08:26:48.823       10/10      3399      2962      3808


Router# show performance-measurement history aggregation rsvp-te
...
Delay-Measurement history (uSec):
      Aggregation Timestamp     Pkt(TX/RX)   Average       Min       Max
      Aug 01 2023 08:37:23.702       40/40      3372      3172      4109


Router# show performance-measurement history advertisement sr-policy
...
Delay-Measurement history (uSec):
          Advertisement Timestamp   Pkt(TX/RX)   Average       Min       Max        Reason
          Aug 01 2023 10:05:14.072       24/24      3408      3408      3408     ACCEL-MAX
Table 5. This table gives show performance-measurement history field descriptions:

Field

Description

TX

Number of packets sent.

RX

Number of packets received.

Average

Average delay of all the delay measures within one probe.

Max

Maximum delay of all the delay measures within one probe.

Min

Minimum delay of all the delay measures within one probe.

Reason

Provides the reason for the delay in packets:"

  • NONE : No advertisements occurred

  • PER-AVG : Periodic timer, average delay threshold crossed

  • PER-MIN : Periodic timer, min delay threshold crossed

  • PER-MAX : Periodic timer, max delay threshold crossed

  • ACCEL-AVG : Accelerated threshold crossed, average delay threshold crossed

  • ACCEL-MIN : Accelerated threshold crossed, min delay threshold crossed

  • ACCEL-MAX : Accelerated threshold crossed, max delay threshold crossed

  • ACCEL-UP-AVG : Accelerated threshold crossed, average delay upper-bound crossed

  • ACCEL-UP-MIN : Accelerated threshold crossed, min delay upper-bound crossed

  • ACCEL-UP-MAX : Accelerated threshold crossed, max delay upper-bound crossed

  • ANOM-MIN-DYN : Min delay A flag toggled and dynamic delay is in effect

  • ANOM-MIN-STA : Min delay A flag toggled and static delay is in effect

  • FIRST : First advertisement

  • NEW-SESSION : New child session

  • ENABLE : Advertisement enabled

  • DISABLE : Advertisement disabled

  • DELETE : Session deleted

  • EXEC-CLEAR : Cleared through exec command

  • ADV-CFG : Advertise delay config

  • ADV-UNCFG : Advertise delay unconfig

  • ERROR : Control code error

  • LINK-DOWN : Link state changed to down

  • SESSION-ERROR : Performance measurement session error

  • DYN-DM : Dynamic delay advertisement is in effect

  • PT-CFG : Path tracing config

  • PT-UNCFG : Path tracing unconfig

  • PT-INTF_READY : Path tracing interface ready

  • PKT-LOSS : Packet loss detected

  • ANOM-PKT-LOSS : PM session anomaly due to packet loss

  • N/A : Invalid advertisement reason

show pim vrf

To view SR multicast tree information for data MDTs, including cache, router-local, and remote MDT information, use the show pim vrf command in EXEC mode.

show pim vrf name mdt sr-p2mp { local tree-id value | remote | cache [ core-src-ip-add [ cust-src-ip-add cust-grp-ip-add ] ] }

Syntax Description

vrf name

VRF for which information is to be displayed.

mdt sr-p2mp

Specifies that the multicast traffic is transported using SR multicast. The MDT-specific information that is to be displayed, has to be provided from the subsequent choices. Based on the chosen option, information is displayed.

local tree-id value

Specifies a locally assigned Tree-SID of the data MDT core tree.

remote

Specifies a Tree-SID of the data MDT tree that is learnt from remote PE routers.

cache [core-src-ip-add [cust-src-ip-add cust-grp-ip-add]]

Specifies data MDT cache information.

Command Default

None

Command Modes

EXEC

Command History

Release Modification

Release 7.3.1

This command was introduced.

Examples

You can view SR multicast tree information for data MDTs, including cache, router-local, and remote MDT information, with these commands.

View Data MDT Cache Information

Router# show pim vrf vpn1 mdt cache 

Core Source      Cust (Source, Group)                Core Data        Expires
192.168.0.3      (26.3.233.1, 232.0.0.1)             [tree-id 524292]  never
192.168.0.4      (27.3.233.6, 232.0.0.1)             [tree-id 524290]  never
   Leaf AD:  192.168.0.3

View Local MDT information

Router# show pim vrf vpn1 mdt sr-p2mp local 

Tree                           MDT             Cache DIP Local VRF Routes  Ondemand
Identifier                     Source          Count     Entry Using Cache Color
[tree-id 524290 (0x80002)]     192.168.0.4     1     N   Y     1           10
   Tree-SID Leaf:  192.168.0.3

Remote MDT information

Router # show pim vrf vpn1 mdt sr-p2mp remote 

Tree                           MDT             Cache DIP Local VRF Routes  On-demand
Identifier                     Source          Count     Entry Using Cache Color
[tree-id 524290 (0x80002)]     192.168.0.4     1     N   N     1           0

show segment-routing mapping-server prefix-sid-map

To verify the locally configured prefix-to-SID mappings, use the show segment-routing mapping-server prefix-sid-map command.

show segment-routing mapping-server prefix-sid-map [ ipv4 | ipv6] [ prefix] [ detail]

Syntax Description

ipv4

(Optional) Specifies an IPv4 address family.

ipv6

(Optional) Specifies an IPv6 address family.

prefix

(Optional) Specifies a prefix.
detail

(Optional) Displays detailed information on the prefix-to-SID mappings.

Command Default

None

Command Modes

EXEC

Command History

Release

Modification

Release 6.3.2

This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

Task ID

Task ID Operation

read

Examples

The example shows how to verify the IPv4 prefix-to-SID mappings:


RP/0/0/CPU0:router# show segment-routing mapping-server prefix-sid-map ipv4
Prefix               SID Index    Range        Flags
20.1.1.0/24          400          300          
10.1.1.1/32          10           200          
Number of mapping entries: 2

The example shows how to display detailed information on the IPv4 prefix-to-SID mappings:


RP/0/0/CPU0:router# show segment-routing mapping-server prefix-sid-map ipv4 detail
Prefix
20.1.1.0/24
    SID Index:      400
    Range:          300
    Last Prefix:    20.2.44.0/24
    Last SID Index: 699
    Flags:          
10.1.1.1/32
    SID Index:      10
    Range:          200
    Last Prefix:    10.1.1.200/32
    Last SID Index: 209
    Flags:          
Number of mapping entries: 2

Related Commands

Command

Description

segment-routing mapping-server

Configures the segment routing mapping server (SRMS).

segment-routing prefix-sid-map advertise-local

Enables the router to advertise the SRMS entries that are locally configured.

segment-routing prefix-sid-map receive disable

Disables mapping client functionality.

show isis segment-routing prefix-sid-map

Displays the active and backup prefix-to-SID mappings for IS-IS.

show ospf segment-routing prefix-sid-map

Displays the active and backup prefix-to-SID mappings for OSPF.

show segment-routing srv6 sid

You can use the show segment-routing srv6 sid command to verify the SRv6 global and locator configuration.

show segment-routing srv6 sid

Syntax Description

This command has no keywords or arguments.

Command Default

None

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 7.8.1

This command output was modified.

Release 7.0.12

This command was introduced.

Usage Guidelines

The command displays SID information across locators. By default, only “active” (i.e. non-stale) SIDs are displayed.

From IOS XR Release 7.8.1, IOS XR nodes with SRv6 Micro-SID F3216 format will accept and allow service SIDs received from non-IOS XR node peers with SRv6 base F128. Non-IOS XR node peers can be without SID Struct TLV (SSTLV), or with an incompatible SSTLV having an SID that is F3216 compatible. This allows for interoperability without any IETF extension or configuration changes on the Non-IOS XR peer node.

The following example shows how to display detailed information on the remote side, with the allocation type:

Router# show segment-routing srv6 locator usid sid fccc:ccc1:1:e00f:: 
 Mon Dec 13 15:58:53.640 EST
 SID                         Behavior          Context                           Owner               State  RW
 --------------------------  ----------------  ------------------------------    ------------------  -----  --
 fccc:ccc1:1:e00f::          uDT46             '**iid'                           rib_lib_test_xtf    InUse  Y
   SID Function: 0xe00f
   SID context: { '**iid' }
     App data: [0000000000000000]
   Locator: 'usid'
   Allocation type: Dynamic | Explicit

show segment-routing traffic-eng p2mp policy

To view SR-TE multicast policy information that is used for transporting IP VPN multicast traffic, use the show segment-routing traffic-eng p2mp policy command in EXEC mode.

show segment-routing traffic-eng p2mp policy [ name policy | root ipv4 address [ tree-ID ] ]

Syntax Description

name policy

Policy for which information is to be displayed.
root ipv4 address [tree-ID]

Specifies that information be displayed for the specified multicast tree root router and the Tree-SID.

Command Default

None

Command Modes

EXEC

Command History

Release Modification

Release 7.3.1

This command was introduced.

Examples

The following example shows how to view SR-TE multicast policy information.

Multicast Tree Information on Routers

Router# show segment-routing traffic-eng p2mp policy 

SR-TE P2MP policy database: 
----------------------
! - Replications with Fast Re-route

Policy: sr_p2mp_root_192.168.0.1_tree_id_524290  LSM-ID: 0x2
 Role: Leaf
 Replication:
  Incoming label: 18001 CC-ID: 6

Policy: sr_p2mp_root_192.168.0.4_tree_id_524290  LSM-ID: 0x80002 (PCC-initiated)
 Color: 0
 LFA FRR: Disabled
 Role: Root
 Replication:
  Incoming label: 18000 CC-ID: 2
  Interface: None [192.168.0.3!]  Outgoing label: 18000 CC-ID: 2
 Endpoints:
  192.168.0.1, 192.168.0.2

For SR multicast policies originated locally on the router (root router of a dynamic MVPN multicast policy) additional policy information is displayed. The information includes color, end points, and whether LFA FRR is requested by the local application. When the SR-PCE server enables LFA FRR on a specific hop, the outgoing information shows the address of the next router with an exclamation mark and None is displayed for the outgoing interface.

For dynamic SR multicast trees created for MVPN, the show command has filters for displaying root multicast router and Tree-ID information. When the root router is specified, all multicast trees for that root are displayed. When root and Tree-ID are specified, only the specified tree information is displayed. 

Router# show segment-routing traffic-eng p2mp policy root ipv4 1.1$

SR-TE P2MP policy database: 
----------------------
! - Replications with Fast Re-route, * - Stale dynamic policies/endpoints

Policy: sr_p2mp_root_1.1.1.1_tree_id_524289  LSM-ID: 0x691 
 Root: 1.1.1.1, ID: 524289
 Role: Transit
 Replication:
  Incoming label: 20000 CC-ID: 28
  Interface: Bundle-Ether23 [192.168.123.3]  Outgoing label: 20000 CC-ID: 28
  Interface: Bundle-Ether25 [192.168.125.5]  Outgoing label: 20000 CC-ID: 28

Policy: sr_p2mp_root_1.1.1.1_tree_id_524290  LSM-ID: 0x692 
 Root: 1.1.1.1, ID: 524290
 Role: Transit
 Replication:
  Incoming label: 19999 CC-ID: 28
  Interface: Bundle-Ether23 [192.168.123.3]  Outgoing label: 19999 CC-ID: 28
  Interface: Bundle-Ether25 [192.168.125.5]  Outgoing label: 19999 CC-ID: 28

show segment-routing local-block inconsistencies

Displays any segment routing local block (SRLB) label inconsistencies.

show segment-routing local-block inconsistencies

Syntax Description

This command has no keywords or arguments.

Command Default

None

Command Modes

EXEC

Command History

Release

Modification

Release 6.3.1

This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

When a new SRLB range is defined, there might be a label conflict (for example, if labels are already allocated, statically or dynamically, in the new SRLB range). In this case, the new SRLB range will be accepted, but not applied (pending). The previous SRLB range (active) will continue to be in use until one of the following occurs:

  • Reload the router to release the currently allocated labels and allocate the new SRLB

  • Use the clear segment-routing local-block discrepancy all command to clear the label conflicts

Task ID

Task ID Operation

Examples

This example shows how to display the SRGB inconsistencies:


RP/0/RSP0/CPU0:router(config)# show segment-routing local-block inconsistencies
Tue Aug 15 13:53:30.555 EDT
SRLB inconsistencies range: Start/End: 30000/30009

Related Commands

Command

Description

clear segment-routing local-block discrepancy all

Clears SRLB label conflicts

segment-routing local-block

Configures the SRLB

srv6 mode base encapsulation

To enter the SRv6 encapsulation submode, use the encapsulation command in the SRv6 base configuration mode.

hw-module profile segment-routing srv6 mode base encapsulation

Syntax Description

This command has no keywords or arguments.

Command Default

None

Command Modes

Segment routing base mode configuration

Command History

Release Modification
Release 7.3.1

This command was introduced.

Usage Guidelines

You must reload the router after enabling this feature.

Task ID

Task ID Operation

system

read, write

Examples

The following example shows how to enter the SRv6 encapsulation submode.


Router# configure 
Router(config)# hw-module profile segment-routing srv6 mode base encapsulation

traceroute sr-mpls

To trace the routes to a destination in a segment routing network, use the traceroute sr-mpls command in XR EXEC mode.

traceroute sr-mpls { ipv4-address/mask | ipv6-address/mask [ fec-type { bgp | generic | igp { ospf | isis } } ] | multipath { ipv4-address/mask | ipv6-address/mask [ fec-type { bgp | generic | igp { ospf | isis } } } | nil-fec | dataplane-only { labels { label1 [ , label2... ] ipv4-address/mask | ipv6-address/mask | policy } } { output { interface interface-path-id } } { nexthop next-hop-ip-address } }

Syntax Description

ipv4 address/mask or ipv6 address/mask

Address prefix of the target and number of bits in the target address network mask.

fec-type

(Optional) Specifies FEC type to be used. Default FEC type is generic.

bgp

Use FEC type as BGP.

generic

Use FEC type as generic.

igp

Use FEC type as OSPF or ISIS.

labels label,label...

Specifies the label stack. Use commas to separate each label.

dataplane-only

Specifies data plane validation without running actual traffic over LSPs.

output interface interface-path-id

Specifies the output interface where echo request packets are sent.

nexthop next-hop-ip-address

Causes packets to go through the specified IPv4 or IPv6 next-hop address.

Command Default

fec-type : generic

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 24.2.1

The dataplane-only keyword was introduced.

Support for IPv6 next-hop address was added.

Release 6.3.1

This command was introduced.

Usage Guidelines

To use this command, you must be in a user group associated with a task group that includes appropriate task IDs. If the user group assignment is preventing you from using a command, contact your AAA administrator for assistance.

For SR-TE policies, provide a valid LSP endpoint for non-Nil-FEC traceroute operation.

Task ID

Task ID

Operations

mpls-te

read, write

Examples

Example

These examples show how to use segment routing traceroute to trace the LSP for a specified IPv4 prefix segment routing id (SID). In the first example, FEC type is not specified. You can also specify the FEC type as shown in the second example. The third example uses multipath traceroute to discover all the possible paths for a IPv4 prefix SID. 

RP/0/RP0/CPU0:router# traceroute sr-mpls 10.1.1.2/32   
 
Tracing MPLS Label Switched Path to 10.1.1.2/32, timeout is 2 seconds
 
Codes: '!' - success, 'Q' - request not sent, '.' - timeout,
  'L' - labeled output interface, 'B' - unlabeled output interface, 
  'D' - DS Map mismatch, 'F' - no FEC mapping, 'f' - FEC mismatch,
  'M' - malformed request, 'm' - unsupported tlvs, 'N' - no rx label, 
  'P' - no rx intf label prot, 'p' - premature termination of LSP, 
  'R' - transit router, 'I' - unknown upstream index,
  'X' - unknown return code, 'x' - return code 0
 
Type escape sequence to abort.
 
  0 10.12.12.1 MRU 1500 [Labels: implicit-null Exp: 0]
! 1 10.12.12.2 3 ms


RP/0/RP0/CPU0:router# traceroute sr-mpls 10.1.1.2/32  fec-type  igp ospf  
 
Tracing MPLS Label Switched Path to 10.1.1.2/32, timeout is 2 seconds
 
Codes: '!' - success, 'Q' - request not sent, '.' - timeout,
  'L' - labeled output interface, 'B' - unlabeled output interface, 
  'D' - DS Map mismatch, 'F' - no FEC mapping, 'f' - FEC mismatch,
  'M' - malformed request, 'm' - unsupported tlvs, 'N' - no rx label, 
  'P' - no rx intf label prot, 'p' - premature termination of LSP, 
  'R' - transit router, 'I' - unknown upstream index,
  'X' - unknown return code, 'x' - return code 0
 
Type escape sequence to abort.
 
  0 10.12.12.1 MRU 1500 [Labels: implicit-null Exp: 0]
! 1 10.12.12.2 2 ms


RP/0/RP0/CPU0:router# traceroute sr-mpls multipath 10.1.1.2/32 
 
Starting LSP Path Discovery for 10.1.1.2/32
 
Codes: '!' - success, 'Q' - request not sent, '.' - timeout,
  'L' - labeled output interface, 'B' - unlabeled output interface, 
  'D' - DS Map mismatch, 'F' - no FEC mapping, 'f' - FEC mismatch,
  'M' - malformed request, 'm' - unsupported tlvs, 'N' - no rx label, 
  'P' - no rx intf label prot, 'p' - premature termination of LSP, 
  'R' - transit router, 'I' - unknown upstream index,
  'X' - unknown return code, 'x' - return code 0
 
Type escape sequence to abort.
 
!
Path 0 found, 
 output interface GigabitEthernet0/0/0/2 nexthop 10.13.13.2
source 10.13.13.1 destination 127.0.0.0
!
Path 1 found, 
 output interface Bundle-Ether1 nexthop 10.12.12.2
source 10.12.12.1 destination 127.0.0.0
 
Paths (found/broken/unexplored) (2/0/0)
Echo Request (sent/fail) (2/0)
Echo Reply (received/timeout) (2/0)
Total Time Elapsed 14 ms

The following example shows how to use segment routing traceroute to validate SR-MPLS over IPv6-based LSPs:

Router#traceroute sr-mpls dataplane-only 2001:DB8::1/32
Tue Jan 16 15:08:54.681 EST
 
Tracing MPLS Label Switched Path with Nil FEC to 2001:DB8::1/32, timeout is 2 seconds
 
Codes: '!' - success, 'Q' - request not sent, '.' - timeout,
  'L' - labeled output interface, 'B' - unlabeled output interface,
  'D' - DS Map mismatch, 'F' - no FEC mapping, 'f' - FEC mismatch,
  'M' - malformed request, 'm' - unsupported tlvs, 'N' - no rx label,
  'P' - no rx intf label prot, 'p' - premature termination of LSP,
  'R' - transit router, 'I' - unknown upstream index,
  'X' - unknown return code, 'x' - return code 0
 
Type escape sequence to abort.
 
  0 11:11:11::1 MRU 1500 [Labels: 18004/explicit-null Exp: 0/0]
L 1 11:11:11::2 MRU 1500 [Labels: implicit-null/explicit-null Exp: 0/0] 3 ms
! 2 15:15:15::4 3 ms

The following example shows how to use segment routing traceroute for SR-TE policies with IPv6-based LSPs:

Router#traceroute sr-mpls nil-fec policy name srte_c_40_ep_2001:DB8::1
Tue Feb  6 12:07:38.295 EST

Tracing MPLS Label Switched Path with Nil FEC for SR-TE Policy srte_c_40_ep_2001:DB8::1, timeout is 2 seconds

Codes: '!' - success, 'Q' - request not sent, '.' - timeout,
  'L' - labeled output interface, 'B' - unlabeled output interface, 
  'D' - DS Map mismatch, 'F' - no FEC mapping, 'f' - FEC mismatch,
  'M' - malformed request, 'm' - unsupported tlvs, 'N' - no rx label, 
  'P' - no rx intf label prot, 'p' - premature termination of LSP, 
  'R' - transit router, 'I' - unknown upstream index,
  'X' - unknown return code, 'x' - return code 0

Type escape sequence to abort.

  0 12:12:12::1 MRU 1500 [Labels: 26134/explicit-null Exp: 0/0]
L 1 12:12:12::3 MRU 1500 [Labels: implicit-null/explicit-null Exp: 0/0] 16 ms
! 2 16:16:16::4 16 ms

The following example shows how to use segment routing traceroute with labels using IPv6 LSPs: 

Router#traceroute sr-mpls labels 18004 lsp-end-point 2001:DB8::1
Tue Feb  6 12:10:41.928 EST

Tracing MPLS Label Switched Path to NIL FEC with lsp end point 2001:DB8::1, SID Label(s) [18004], timeout is 2 seconds

Codes: '!' - success, 'Q' - request not sent, '.' - timeout,
  'L' - labeled output interface, 'B' - unlabeled output interface, 
  'D' - DS Map mismatch, 'F' - no FEC mapping, 'f' - FEC mismatch,
  'M' - malformed request, 'm' - unsupported tlvs, 'N' - no rx label, 
  'P' - no rx intf label prot, 'p' - premature termination of LSP, 
  'R' - transit router, 'I' - unknown upstream index,
  'X' - unknown return code, 'x' - return code 0

Type escape sequence to abort.

  0 11:11:11::1 MRU 1500 [Labels: 18004/explicit-null Exp: 0/0]
L 1 11:11:11::2 MRU 1500 [Labels: implicit-null/explicit-null Exp: 0/0] 7 ms
! 2 15:15:15::4 3 ms

UCMP Disable

To disable Unequal-Cost Multiple Path (UCMP) for specific Flexible Algorithm use this command in ISIS Address Family submode.

UCMP Disable

Syntax Description

UCMP Disable

Disables UCMP functionality.

Command Default

None.

Command Modes

IS-IS interface address-family configuration

Command History

Release

Modification

Release 24.1.1

This command was introduced.

Usage Guidelines

UCMP must be configured at the ISIS Address Family instance.

Task ID

Task ID

Operations

isis

read, write

Examples

Example configuration to disable UCMP of specific Flexible Algorithm. Here, it is Flex-algo 128


Router(config)# router isis 1
Router(config-isis-flex-algo)# flex-algo 128
Router(config-isis-flex-algo)# ucmp disable