MPLS Label Distribution Protocol Commands


Note

All commands applicable for 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

    • N540-12Z20G-SYS-A

    • N540-12Z20G-SYS-D

    • N540X-12Z16G-SYS-A

    • N540X-12Z16G-SYS-D

This module describes the commands used to configure Label Distribution Protocol (LDP) in a Multiprotocol Label Switching (MPLS) network on the .

LDP provides a standard methodology for hop-by-hop (or dynamic label) distribution in an MPLS network by assigning labels to routes that have been chosen by the underlying Interior Gateway Protocol (IGP) routing protocols. The resulting labeled paths, called label switch paths (LSPs), forward labeled traffic across an MPLS backbone.

LDP also provides the means for label switching routers (LSRs) to request, distribute, and release label prefix binding information to peer routers in a network. LDP enables LSRs to discover potential peers and establish LDP sessions with those peers to exchange label binding information.

For detailed information about MPLS concepts, configuration tasks, and examples, see MPLS Configuration Guide for Cisco NCS 5500 Series RoutersMPLS Configuration Guide for Cisco NCS 540 Series RoutersMPLS Configuration Guide for Cisco NCS 560 Series RoutersMPLS Configuration Guide for Cisco NCS 540 Series Routers.

backoff

To configure the parameters for the Label Distribution Protocol (LDP) backoff mechanism, use the backoff command in MPLS LDP configuration mode. To return to the default behavior, use the no form of this command.

backoff initial maximum

no backoff

Syntax Description

initial

Initial backoff delay, in seconds. Range is 5 to 2147483 50331.

maximum

Maximum backoff delay, in seconds. Range is 5 to 2147483 50331.

Command Default

initial : 15

maximum : 120

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

The LDP backoff mechanism prevents two incompatibly configured label switch routers from engaging in an unthrottled sequence of session setup failures. If a session setup attempt fails (due to incompatibility), each Label Switching Router (LSR) delays the next attempt, increasing the delay exponentially with each successive failure until the maximum backoff delay is reached.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to configure the initial backoff delay to 30 seconds and the maximum backoff delay to 240 seconds: 


RP/0/RP0/CPU0:router# configure
RP/0/RP0/CPU0:router(config)# mpls ldp
RP/0/RP0/CPU0:router(config-ldp)# backoff 30 240

clear mpls ldp forwarding

To clear (or reset) the MPLS Label Distribution Protocol (LDP) forwarding rewrites, use the clear mpls ldp forwarding command in XR EXEC mode.

clear mpls ldp [vrf vrf-name] [ipv4 | ipv6] forwarding [prefix/length ]

Syntax Description

vrf vrf-name

(Optional) Clears the VRF information for the specified VRF.

ipv4

(Optional) Specifies IP version 4 address family.

ipv6

(Optional) Specifies IP version 6 address family.

prefix

(Optional) Destination prefix, written in A.B.C.D format.

length

(Optional) Network mask length, in bits. Range is 0 to 32.

Command Default

No default behavior or values

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

This command resets LDP installed forwarding state for all prefixes or a given prefix. It is useful when installed LDP forwarding state needs to be reprogrammed in LSD and MPLS forwarding.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

This example shows how to clear (or reset) the MPLS LDP forwarding rewrites using the clear mpls ldp forwarding command: 



RP/0/RP0/CPU0:router# clear mpls ldp forwarding

clear mpls ldp msg-counters neighbor

To clear the Label Distribution Protocol (LDP) message counters, use the clear mpls ldp msg-counters neighbor command in XR EXEC mode.

clear mpls ldp [vrf vrf-name] msg-counters neighbor [lsr-id | ldp-id]

Syntax Description

vrf vrf-name

(Optional) Clears the VRF information for the specified VRF.

lsr-id

LSR ID of neighbor in A.B.C.D format.

ldp-id

LDP ID of neighbor in A.B.C.D: format.

Command Default

No default behavior or values

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

Use the clear mpls ldp msg-counters neighbor command to clear the statistics on message counters for a specific neighbor (IP address) or for all neighbors. These message counters count the number of LDP protocol messages sent to and received from LDP neighbors.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to clear message counters for neighbor 10.20.20.20: 


RP/0/RP0/CPU0:router# clear mpls ldp msg-counters neighbor 10.20.20.20

clear mpls ldp neighbor

To force Label Distribution Protocol (LDP) session restart, use the clear mpls ldp neighbor command in XR EXEC mode.

clear mpls ldp [vrf all] [vrf vrf-name] neighbor [ip-address | ldp-id]

Syntax Description

vrf all

(Optional) Clears all LDP configured VRF neighbors.

vrf vrf-name

(Optional) Clears the VRF information for the specified VRF.

ip-address

(Optional) Neighbor IP address.

ldp-id

(Optional) Neighbor LDP ID in A.B.C.D: format.

Command Default

No default behavior or values

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

Use the clear mpls ldp neighbor command to restart a single LDP session or all LDP sessions (without restarting the LDP process itself).

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to force an unconditional LDP session restart: 


RP/0/RP0/CPU0:router# clear mpls ldp neighbor 10.20.20.20

clear mpls ldp nsr statistics neighbor

To clear the nonstop routing (NSR) statistics, use the clear mpls ldp nsr statistics neighbor command in XR EXEC mode.

clear mpls ldp [vrf vrf-name] nsr statistics neighbor [lsr-id | ldp-id]

Syntax Description

vrf vrf-name

(Optional) Displays the VRF information for the specified VRF.

lsr-id

(Optional) LSR ID of neighbor in A.B.C.D format.

ldp-id

(Optional) LDP ID of neighbor in A.B.C.D: format.

Command Default

No default behavior or values

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID Operation

mpls-ldp

read

Examples

The following example shows how to clear NSR statistics for neighbor 10.20.20.20: 


RP/0/RP0/CPU0:router#clear mpls ldp nsr statistics neighbor 10.20.20.20

debug mpls ldp rsi

To enable the display of MPLS LDP router space infrastructure (RSI) debugging events, use the debug mpls ldp rsi command in XR EXEC mode. To disable the display of MPLS LDP RSI debugging information, use the no form of this command.

debug mpls ldp rsi [location node-id]

no debug mpls ldp rsi [location node-id]

Syntax Description

location node-id

(Optional) Displays location information for the specified node ID.

Command Default

No default behavior or values

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID Operation

mpls-ldp

read

Examples

The following example shows how to enable MPLS LDP RSI debugging events: 



RP/0/RP0/CPU0:router# debug mpls ldp rsi

debug mpls ldp vrf

To enable the display of MPLS LDP virtual routing and forwarding (VRF) debugging events, use the debug mpls ldp vrf command in XR EXEC mode. To disable the display of MPLS LDP VRF debugging information, use the no form of this command.

debug mpls ldp vrf [location node-id]

no debug mpls ldp vrf [location node-id]

Syntax Description

location node-id

(Optional) Displays location information for the specified node ID.

Command Default

No default behavior or values

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID Operation

mpls-ldp

read

Examples

The following example shows how to enable MPLS LDP VRF debugging events: 



RP/0/RP0/CPU0:router# debug mpls ldp vrf

default-route

To enable Multiprotocol Label Switching (MPLS) switching for IP default route by allocating and advertising non-null label, use the default-route command in MPLS LDP configuration mode. To return to the default behavior, use the no form of this command.

default-route

no default-route

Syntax Description

This command has no arguments or keywords.

Command Default

Allocates null (implicit or explicit) local label for IP default route prefix 0.0.0.0/0.

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

When the IP default route 0.0.0.0/0 is configured on an egress router, it is advertised through Interior Gateway Protocol (IGP) to other routers to enable default IP forwarding. When MPLS LDP is configured and establishing label switch paths (LSPs) for other prefixes, you can emulate default forwarding and switching for MPLS in the same way as IP forwarding. To do so, allocate a non-null local label and advertise this label to its peers.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to enable default MPLS switching for default prefix: 


RP/0/RP0/CPU0:router(config-ldp)# default-route

default-vrf implicit-ipv4 disable

To disable the implicitly enabled IPv4 address family for default VRF, use the default-vrf implicit-ipv4 disable command in MPLS LDP configuration mode.

default-vrf implicit-ipv4 disable

This command has no keywords or arguments.

Command Default

No default behavior or values

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID Operation

mpls ldp

read, write

Examples

The following example shows how to disable the implicitly enabled IPv4 address family for default VRF: 


RP/0/0/CPU0:ios#configure
RP/0/0/CPU0:ios(config)#mpls ldp
RP/0/0/CPU0:ios(config-ldp)#router-id 5.5.5.5
RP/0/0/CPU0:ios(config-ldp)#default-vrf implicit-ipv4 disable

discovery hello

To configure the interval between transmission of consecutive Label Distribution Protocol (LDP) discovery hello messages and the holdtime for a discovered LDP neighbor, use the discovery hello command in MPLS LDP configuration mode. To return to the default behavior, use the no form of this command.

discovery hello {holdtime seconds | interval seconds}

no discovery hello {holdtime | interval}

Syntax Description

holdtime

Sets the time, in seconds, a discovered LDP neighbor is remembered without receipt of an LDP hello message from the neighbor. Default is 15.

interval

Sets the time, in seconds, between consecutive hello messages. Default is 5.

seconds

Time value, in seconds. Range is 1 to 65535 (65535 means infinite).

Command Default

holdtime : 15

interval : 5

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to configure the link hello holdtime to 30 seconds: 


RP/0/RP0/CPU0:router(config-ldp)# discovery hello holdtime 30

The following example shows how to configure the link hello interval to 10 seconds: 


RP/0/RP0/CPU0:router(config-ldp)# discovery hello interval 10

discovery instance-tlv disable

To disable transmit and receive processing for Type-Length-Value (TLV), use the discovery instance-tlv disable command in MPLS LDP configuration mode. To return to the default behavior, use the no form of this command.

discovery instance-tlv disable

no discovery instance-tlv disable

Syntax Description

This command has no arguments or keywords.

Command Default

No default behavior or values

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to disable transmit and receive processing for TLV: 


RP/0/RP0/CPU0:router# configure
RP/0/RP0/CPU0:router(config)# mpls ldp
RP/0/RP0/CPU0:router(config-ldp)# discovery instance-tlv disable

discovery targeted-hello

To configure the interval between transmission of consecutive Label Distribution Protocol (LDP) discovery targeted-hello messages, the hold time for a discovered targeted LDP neighbor, and to accept targeted hello from peers, use the discovery targeted-hello command in MPLS LDP configuration mode. To return to the default behavior, use the no form of this command.

discovery targeted-hello address-family {ipv4 | ipv6} {accept | [from acl] | holdtime seconds | interval seconds}

no discovery targeted-hello {accept | holdtime | interval}

Syntax Description

accept

Accepts targeted hellos from any source.

ipv4

Specifies IP version 4 address family.

ipv6

Specifies IP version 6 address family.

from acl

(Optional) Accepts targeted hellos from LDP peers as permitted by the access-list.

holdtime

Configures the time a discovered LDP neighbor is remembered without receipt of an LDP hello message from a neighbor.

interval

Displays time between consecutive hello messages.

seconds

Time value, in seconds. Range is 1 to 65535.

Command Default

accept : Targeted hello messages are not accepted from any source (neighbor).

holdtime : 90

interval : 10

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

LDP supports IPv4 standard access lists only.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to configure the targeted-hello holdtime to 45 seconds: 


RP/0/RP0/CPU0:router(config-ldp)# discovery targeted-hello holdtime 45

The following example shows how to configure the targeted-hello interval to 5 seconds: 


RP/0/RP0/CPU0:router(config-ldp)# discovery targeted-hello interval 5

The following example shows how to configure acceptance of targeted hellos from all peers: 


RP/0/RP0/CPU0:router(config-ldp)# discovery targeted-hello accept

The following example shows how to configure acceptance of targeted hello from peers 10.1.1.1 and 10.2.2.2 only: 


RP/0/RP0/CPU0:router(config)# ipv4 access-list peer_acl_10
RP/0/RP0/CPU0:router(config-ipv4-acl)# permit 10.1.1.1
RP/0/RP0/CPU0:router(config-ipv4-acl)# permit 10.2.2.2
RP/0/RP0/CPU0:router(config-ldp)# discovery targeted-hello accept from peer_acl_10

discovery transport-address

To provide an alternative address for a TCP connection, use the discovery transport-address command in MPLS LDP interface configuration mode. To return to the default behavior, use the no form of this command.

[vrf vrf-name ] [interface type interface-path-id] address-family ipv4 | ipv6 discovery transport-address {ip-address | interface}

no [vrf vrf-name ] [interface type interface-path-id address-family] {ipv4 | ipv6} discovery transport-address {ip-address | interface}

Syntax Description

vrf vrf-name

(Optional) Specifies the VRF name.

interface type

(Optional) Interface type. For more information, use the question mark (?) online help function.

interface-path-id

Physical interface or a virtual interface.

Note 

Use the show interfaces command to see a list of all possible interfaces currently configured on the router.

For more information about the syntax for the router, use the question mark (?) online help function.

address-family ipv4

Specifies IP version 4 address family.

ipv6

Specifies IP version 6 address family.

ip-address

IP address to be advertised as the transport address in discovery hello messages.

interface

Advertises the IP address of the interface as the transport address in discovery hello messages.

Command Default

LDP advertises its LDP router ID as the transport address in LDP discovery hello messages.

Command Modes

MPLS LDP interface configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

Establishing an LDP session between two routers requires a TCP session connection. To establish the TCP session connection, each router must know the transport address (IP address) of the other router.

The LDP discovery mechanism provides the means for a router to advertise transport addresses. Transport address is implicit or explicit. Implicit addresses do not appear as part of the contents of the discovery hello messages sent to the peer. If explicit, the advertisement appears as part of the contents of discovery hello messages sent to the peer.

The discovery transport-address command modifies the default behavior described above. Using the interface keyword, LDP advertises the IP address of the interface in LDP discovery hello messages sent from the interface. Using the ip-address argument, LDP advertises the IP address in LDP discovery hello messages sent from the interface.


Note

When a router has multiple links connecting it to its peer device, the router must advertise the same transport address in the LDP discovery hello messages it sends on all such interfaces.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to specify an exiting address (10.10.3.1) as the transport address on an interface HundredGigE 0/1/0/0: 


RP/0/RP0/CPU0:router(config-ldp)# interface POS 0/1/0/0interface POS 0/1/0/0 
RP/0/RP0/CPU0:router(config-ldp-if)# address-family ipv4
RP/0/RP0/CPU0:router(config-ldp-if-af)#discovery transport-address 10.10.3.1
  
RP/0/RP0/CPU0:router# show mpls ldp neighbor
  
  Peer LDP Identifier: 10.44.44.44:0
    TCP connection: 10.44.44.44:65520 - 10.10.3.1:646
    Graceful Restart: Yes (Reconnect Timeout: 15 sec, Recovery: 180 sec)
    State: Oper; Msgs sent/rcvd: 13/9
    Up time: 00:00:11
    LDP Discovery Sources: 
         POS 0/1/0/0
    Addresses bound to this peer:
      10.10.3.2       10.44.44.44

downstream-on-demand

To configure MPLS Label Distribution Protocol (LDP) downstream-on-demand mode, use the downstream-on-demand command in MPLS LDP configuration mode. To return to the default behavior, use the no form of this command.

[vrf vrf-name session] downstream-on-demand with access-list

Syntax Description

vrf vrf-name

(Optional) Displays the VRF information for the specified VRF.

session

(Optional) Configures session parameters.

with

Displays access list of LDP peers.

access-list

IPv4 access-list name.

Command Default

No default behavior or values

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID Operation

mpls-ldp

read, write

Examples

This is a sample output from the downstream-on-demand command: 


RP/0/RP0/CPU0:router(config-ldp)# downstream-on-demand with access-list

explicit-null

To configure a router to advertise explicit null labels instead of implicit null labels, use the explicit-null command in MPLS LDP configuration mode. To return to the default behavior, use the no form of this command.

[vrf vrf-name] address-family {ipv4 | ipv6} label local advertise explicit-null [to peer-acl | for prefix-acl [to peer-acl]]

no [vrf vrf-name] address-family {ipv4 | ipv6} label local advertise explicit-null [to peer-acl | for prefix-acl [to peer-acl]]

Syntax Description

vrf vrf-name

(Optional) Specifies the VRF name.

address-family ipv4

Specifies IP version 4 address family.

ipv6

Specifies IP version 6 address family.

label

Configures label control and policies.

local

Configures local label control and policies.

advertise

Configures outbound label advertisement control.

to peer-acl

(Optional) Specifies LDP peers for which explicit-null is advertised instead of implicit-null. Range is 1 to 99.

for prefix-acl

(Optional) Specifies prefixes for which explicit-null is advertised instead of implicit-null. Range is 1 to 99.

Command Default

Implicit null is advertised as default null label for routes, such as directly connected routes.

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

Normally, LDP advertises an implicit null label for directly connected routes. The implicit null label causes the previous hop router to perform next to last router hop popping.

The explicit-null command advertises the explicit-null labels in place of implicit null labels for directly connected prefixes.

LDP supports IPv4 standard access lists only.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following command shows how to advertise explicit null for all directly connected routes to all LDP peers: 


RP/0/RP0/CPU0:router(config-ldp-af-lbl-lcl-advt)# explicit-null

The following command sequence shows how to advertise explicit-null for directly connected route 192.168.0.0 to all LDP peers and implicit-null for all other directly connected routes:

RP/0/RP0/CPU0:router(config)# ipv4 access-list pfx_acl_192_168 RP/0/RP0/CPU0:router(config-ipv4-acl)# permit 192.168.0.0 RP/0/RP0/CPU0:router(config-ldp-af-lbl-lcl-advt)# explicit-null for pfx_acl_192_168

The following command sequence shows how to send explicit-null for all directly connected routes to peers 10.1.1.1 and 10.2.2.2 and implicit-null to all other peers: 


RP/0/RP0/CPU0:router(config)# ipv4 access-list peer_acl_10
RP/0/RP0/CPU0:router(config-ipv4-acl)# permit 10.1.1.1
RP/0/RP0/CPU0:router(config-ipv4-acl)# permit 10.2.2.2
RP/0/RP0/CPU0:router(config-ldp-af-lbl-lcl-advt)# explicit-null to peer_acl_10

The following command shows how to advertise explicit-null for prefix 192.168.0.0 to peers 10.1.1.1 and 10.2.2.2 and advertise implicit-null for all other applicable routes to all other peers: 


RP/0/RP0/CPU0:router(config-ldp-af-lbl-lcl-advt)# explicit-null for pfx_acl_192_168 to peer_acl_10

graceful-restart (MPLS LDP)

To configure graceful restart, use the graceful-restart command in MPLS LDP configuration mode. To return to the default behavior, use the no form of this command.

graceful-restart [reconnect-timeout seconds | forwarding-state-holdtime seconds]

no graceful-restart [reconnect-timeout | forwarding-state-holdtime]

Syntax Description

reconnect-timeout seconds

(Optional) Configures the time that the local LDP sends to its graceful restartable peer, indicating how long its neighbor should wait for reconnection in the event of a LDP session failure, in seconds. Range is 60 to 1800.

forwarding-state-holdtime seconds

(Optional) Configures the time the local forwarding state is preserved (without being reclaimed) after the local LDP control plane restarts, in seconds. Range is 60 to 1800.

Command Default

By default, graceful restart is disabled.

reconnect-timeout : 120

forwarding-state-holdtime : 180

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

Use the LDP graceful restart capability to achieve nonstop forwarding (NSF) during an LDP control plane communication failure or restart. To configure graceful restart (MPLS LDP) between two peers, enable LDP graceful restart on both label switch routers (LSRs).

When an LDP graceful restart session is established and there is control plane failure, the peer LSR starts graceful restart procedures, initially keeps the forwarding state information pertaining to the restarting peer, and marks this state as stale. If the restarting peer does not reconnect within the reconnect timeout, the stale forwarding state is removed. If the restarting peer reconnects within the reconnect time period, it is provided recovery time to resynchronize with its peer. After this time, any unsynchronized state is removed.

The value of the forwarding state hold time keeps the forwarding plane state associated with the LDP control-plane in case of a control-plane restart or failure. If the control plane fails, the forwarding plane retains the LDP forwarding state for twice the forwarding state hold time. The value of the forwarding state hold time is also used to start the local LDP forwarding state hold timer after the LDP control plane restarts. When the LDP graceful restart sessions are renegotiated with its peers, the restarting LSR sends the remaining value of this timer as the recovery time to its peers. Upon local LDP restart with graceful restart enabled, LDP does not replay forwarding updates to MPLS forwarding until the forwarding state hold timer expires.


Note

In the presence of a peer relationship, any change to the LDP graceful restart configuration will restart LDP sessions. If LDP configuration changes from nongraceful restart to graceful restart, all the sessions are restarted. Only graceful restart sessions are restarted upon graceful restart to nongraceful restart configuration changes.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to configure an existing session for graceful restart: 


RP/0/RP0/CPU0:router(config-ldp)# graceful-restart
  
RP/0/RP0/CPU0:router:Apr  3 10:56:05.392 : mpls_ldp[336]: %ROUTING-LDP-5-NBR_CHANGE : Nbr 2.2.2.2:0, DOWN 
RP/0/RP0/CPU0:router:Apr  3 10:56:05.392 : mpls_ldp[336]: %ROUTING-LDP-5-NBR_CHANGE : Nbr 3.3.3.3:0, DOWN 
RP/0/RP0/CPU0:router:Apr  3 10:56:09.525 : mpls_ldp[336]: %ROUTING-LDP-5-NBR_CHANGE : Nbr 3.3.3.3:0, UP 
RP/0/RP0/CPU0:router:Apr  3 10:56:11.114 : mpls_ldp[336]: %ROUTING-LDP-5-NBR_CHANGE : Nbr 2.2.2.2:0, UP 
  
RP/0/RP0/CPU0:router# show mpls ldp neighbor brief
  
  Peer              GR Up Time         Discovery Address
  ----------------- -- --------------- --------- -------
  3.3.3.3:0         Y  00:01:04                3       8
  2.2.2.2:0         N  00:01:02                2       5
  
RP/0/RP0/CPU0:router# show mpls ldp graceful-restart
  
    Forwarding State Hold timer : Not Running
    GR Neighbors                : 1
  
     Neighbor ID      Up  Connect Count  Liveness Timer      Recovery Timer    
     ---------------  --  -------------  ------------------  ------------------
     3.3.3.3          Y        1                -                   -

session holdtime (MPLS LDP)

To change the time for which an Label Distribution Protocol (LDP) session is maintained in the absence of LDP messages from the session peer, use the session holdtime command in MPLS LDP configuration mode. To return to the default behavior, use the no form of this command.

session holdtime seconds

no session holdtime

Syntax Description

seconds

Time, in seconds, that an LDP session is maintained in the absence of LDP messages from the session peer. Range is 15 to 65535.

Command Default

seconds : 180

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to change the hold time of LDP sessions to 30 seconds: 


RP/0/RP0/CPU0:router(config-ldp)# session holdtime 30

igp auto-config disable

To disable Label Distribution Protocol (LDP) auto-configuration, use the igp auto-config disable command in MPLS LDP interface configuration mode. To return to the default behavior, use the no form of this command.

igp auto-config disable

no igp auto-config disable

Syntax Description

This command has no arguments or keywords.

Command Default

No default behavior or values

Command Modes

MPLS LDP interface configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

IGP auto-configuration can be enabled on ISIS and OSPF. Configuration details are described in Routing Configuration Guide for Cisco NCS 5500 Series Routers.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to disable LDP auto-configuration on POS 0/1/0/3: 


RP/0/RP0/CPU0:router(config)# mpls ldp
RP/0/RP0/CPU0:router(config-ldp)# interface pos 0/1/0/3
RP/0/RP0/CPU0:router(config-ldp-if)# igp auto-config disable

igp sync delay

To enable Label Distribution Protocol (LDP) Interior Gateway Protocol (IGP) sync delay timer feature, use the igp sync delay command in MPLS LDP configuration mode. To return to the default behavior, use the no form of this command.

igp sync delay seconds

no igp sync delay

Syntax Description

seconds

Time, in seconds, that declaration of LDP sync state being up is delayed after session establishment upon link coming up. Range is 5 to 300.

Command Default

LDP does not delay declaration of sync up and notifies IGP as soon as sync up conditions are met for a link.

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

  • By default, LDP declares LDP sync up as soon as all the requisite conditions are met, namely:

    • LDP session is up.
    • LDP has sent all its label bindings to at least one peer.
    • LDP has received at least one label binding from a peer.

    This minimizes traffic loss on link up but can still lead to substantial traffic loss under certain circumstances (for example, when interoperating with an LSR with ordered mode operation). It may be necessary to delay declaration of sync up after the session comes up by configuring a timeout period.

  • When the graceful-restart event is configured, the IGP sync delay timer does not take effect.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to configure LDP to delay declaration of sync-up to 30 seconds: 


RP/0/RP0/CPU0:router# configure
RP/0/RP0/CPU0:router(config)# mpls ldp
RP/0/RP0/CPU0:router(config-ldp)# igp sync delay 30

igp sync delay on-proc-restart

To delay the declaration of synchronization events to the Interior Gateway Protocol (IGP) when the label distribution protocol (LDP) fails or restarts, use the igp sync delay on-proc restart command in MPLS LDP configuration mode. To return to the default behavior, use the no form of this command.

igp sync delay on-proc restart seconds

no igp sync delay on-proc restart seconds

Syntax Description

seconds

Time, in seconds, duration of process-level delay for synchronization events when the LDP fails or restarts. Range is from 60 to 600.

Command Default

This command is disabled by default.

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

The igp sync delay on-proc restart command enables a process-level delay for synchronization events when the LDP fails or restarts. This delay defers the sending of sync-up events to the IGP until most or all the LDP sessions converge and also allows the LDP to stabilize. This allows the LDP process failure to be less stressful because IGPs receive all the sync-up events in bulk. This means that the IGP is required to run the shortest path first (SPF) and link-state advertisements (LSAs) only one time with an overall view of the sync-up events.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to configure LDP to delay the declaration of synchronization events to IGP by 60 seconds: 


RP/0/RP0/CPU0:router# configure
RP/0/RP0/CPU0:router(config)# mpls ldp
RP/0/RP0/CPU0:router(config-ldp)# igp sync delay on-proc restart 60

The following example shows the status following execution of the command: 


RP/0/RP0/CPU0:router# show mpls ldp igp sync
  
  Process Restart Sync Delay: 60 sec, Gloal timer running (15 sec remaining)
  GigabitEthernet0/3/0/2:
  Sync status: Deferred
  ….

When the timer is not running, the output displays the following: 

Process Restart Sync Delay: 60 sec, Global timer not running

implicit-null-override

To configure a router to advertise implicit null labels to a set of prefixes, for which a non-null label is to be advertised by default, use the implicit-null-override command in MPLS LDP label configuration mode. To return to the default behavior, use the no form of this command.

[vrf vrf-name] address-family {ipv4 | ipv6} label local implicit-null-override {for prefix-acl}

no [vrf vrf-name] address-family {ipv4 | ipv6} label local implicit-null-override

Syntax Description

vrf vrf-name

(Optional) Specifies the VRF name.

address-family ipv4

Specifies IP version 4 address family.

ipv6

Specifies IP version 6 address family.

label

Configure label control and policies.

local

Configure local label control and policies.

for prefix-acl

Specifies the usage of implicit-null label to a set of prefixes. Range is 1 to 99.
Note 

This command works with any prefix including static, IGP, and BGP, when specified in the ACL.

Command Default

Implicit null is advertised as default null label for routes, such as directly connected routes, whereas a non-null label is advertised for IGP, BGP, and static prefixes.

Command Modes

MPLS LDP label configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID Operation

mpls-ldp

read, write

Examples

The following command shows how to advertise implicit-null label to a specific LDP peer: 


RP/0/RP0/CPU0:router(config-ldp-af-lbl-lcl)# implicit-null-override for 80

interface (MPLS LDP)

To configure or enable Multiprotocol Label Switching (MPLS) Label Distribution Protocol (LDP) on an interface, use the interface command in MPLS LDP configuration mode. To return to the default behavior, use the no form of this command.

interface type interface-path-id

no interface type interface-path-id

Syntax Description

type

Interface type. For more information, use the question mark (?) online help function.

interface-path-id

Physical interface or a virtual interface.

Note 

Use the show interfaces command to see a list of all possible interfaces currently configured on the router.

For more information about the syntax for the router, use the question mark (?) online help function.

Command Default

No default behavior or values

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

When you configure LDP on an interface, the LDP process begins neighbor discovery, sending link hello messages on the interface. This can result in a session setup with discovered neighbors. When LDP is enabled on tunnel-te interfaces, targeted discovery procedures apply.

LDP interface configuration supports forward reference; accordingly, it is possible to configure a nonexisting interface under LDP.


Note

You cannot enable LDP on loopback and GRE tunnel interfaces.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to configure LDP on POS interface 0/1/0/0: 


RP/0/RP0/CPU0:router# configure
RP/0/RP0/CPU0:router(config)# mpls ldp
RP/0/RP0/CPU0:router(config-ldp)# interface POS 0/1/0/0
RP/0/RP0/CPU0:router(config-ldp-if)#

The following example shows how to configure LDP on an MPLS TE tunnel: 


RP/0/RP0/CPU0:router# configure
RP/0/RP0/CPU0:router(config)# mpls ldp
RP/0/RP0/CPU0:router(config-ldp)# interface tunnel-te 123
RP/0/RP0/CPU0:router(config-ldp-if)#
This example shows how to configure MPLS LDP over BVI interfaces: 

RP/0/RP0/CPU0:router#configure 
RP/0/RP0/CPU0:router(config)#mpls ldp 
RP/0/RP0/CPU0:router(config-ldp)#interface BVI 65535
RP/0/RP0/CPU0:router(config-ldp-if)#

Only static MPLS tunnels can use BVI as next hop. You can use a BVI for static MPLS configuration, and not for dynamic MPLS configuration, such as label distribution using LDP.

label accept

To control the receipt of labels (remote bindings) for a set of prefixes from a peer, use the label accept command in MPLS LDP configuration mode. To return to the default behavior, use the no form of this command.

label accept for prefix-acl from ip-address

no label accept for prefix-acl from ip-address

Syntax Description

for prefix-acl

Accepts and retains remote bindings for prefixes that are permitted by the prefix access list prefix-acl argument.

from ip-address

Displays the peer IP address.

Command Default

LDP accepts and retains label bindings for all prefixes from all peers.

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

By default, LDP accepts labels (as remote bindings) for all prefixes from all its peers. To save resources (such as memory) configure the access list to specify label and binding acceptance for a set of prefixes from a peer.

If the inbound label filtering policy changes such that it now allows previously denied prefixes from a peer, you must reset the LDP session with the peer using the clear mpls ldp neighbor command.

LDP supports IPv4 standard access lists only.


Note

Label acceptance control is also referred to as LDP inbound label filtering.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to configure inbound label filtering policy. In this example, an LSR is configured to accept and retain label bindings for prefixes 192.168.1.1 (pfx_acl_1) from peer 1.1.1.1, prefix 192.168.2.2 (pfx_acl_2) from peer 2.2.2.2, and prefixes 192.168.1.1, 192.168.2.2, 192.168.3.3 (pfx_acl_3) from peer 3.3.3.3: 


RP/0/RP0/CPU0:router(config-ldp)# label accept
RP/0/RP0/CPU0:router(config-ldp-lbl-acpt)# for pfx_acl_1 from 1.1.1.1
RP/0/RP0/CPU0:router(config-ldp-lbl-acpt)# for pfx_acl_2 from 2.2.2.2
RP/0/RP0/CPU0:router(config-ldp-lbl-acpt)# for pfx_acl_3 from 3.3.3.3

label advertise

To control the advertisement of local labels, use the label advertise command in MPLS LDP configuration mode. To return to the default behavior, use the no form of this command.

label advertise [disable | for prefix-acl [to peer-acl] | interface type interface-path-id]

no label advertise [disable | for prefix-acl [to peer-acl] | interface type interface-path-id]

Syntax Description

disable

(Optional) Disables label advertisement to all peers for all prefixes.

for prefix-acl

(Optional) Specifies prefix destinations for which labels will be advertised.

to peer-acl

(Optional) Specifies which LDP neighbors will receive label advertisements.

interface

(Optional) Specifies an interface for label allocation and advertisement of its interface IP address.

type

Interface type. For more information, use the question mark (?) online help function.

interface-path-id

Physical interface or a virtual interface.

Note 

Use the show interfaces command to see a list of all possible interfaces currently configured on the router.

For more information about the syntax for the router, use the question mark (?) online help function.

Command Default

LDP advertises labels for all known prefixes to all peers. LDP does not advertise labels for local interfaces addresses other than Loopback interfaces.

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

The label advertise command determines how the label switch router (LSR) advertises local labels. The following rules describe the effects of running multiple commands:

  • Every command has a prefix-acl or peer-acl pair associated with it, as follows:

    • In the absence of the for or to keywords, the access list pair is (none, none).

    • When using the for keyword without the to keyword, the access list is (prefix-acl, none).

  • A prefix can have a maximum of one (prefix-acl, peer-acl) pair, as follows:

    • A (prefix-acl, peer-acl) pair applies to a prefix only if the prefix-acl matches the prefix. A match occurs if the prefix-acl permits the prefix.

    • If more than one (prefix-acl, peer-acl) pair from multiple label advertise commands matches a prefix, the (prefix-acl, peer-acl) pair in the first command applies to the prefix. The order in which the label advertise commands are processed is sorted based on the ACL names in a MIB-lexicographical way (shorter ACL name length is processed first, if two ACLs are of equal length, then dictionary ordering is used).

  • When an LSR is ready to advertise a label for a prefix, the LSR determines whether a (prefix-acl, peer-acl) pair applies to the prefix.

    • If none applies, and if the disable keyword has been configured for the command, the label for the prefix is not advertised to any peer; otherwise, the label is advertised to all peers.

    • If a (prefix-acl, peer-acl) pair applies to the prefix, and if the prefix-acl denies the prefix, the label is not advertised to any peer.

    • If (prefix-acl, peer-acl) pair applies to the prefix and if the prefix-acl denies the prefix, the label is not advertised to peers defined in the peer-acl. Nevertheless, the prefix may be matched in subsequent (prefix-acl, peer-acl) entries and advertised to other peers.

    • If the prefix-acl permits the prefix and there is a peer-acl, the label is advertised to all peers permitted by the peer-acl.

    Normally, LDP advertises labels for non-BGP routes present in the routing table. Additionally, LDP advertises labels from /32 IP addresses on Loopback interfaces and does not advertise /32 addresses for other non-Loopback interfaces. To control advertisement of labels for /32 IP addresses on these interfaces, use the label advertise interface command.

    LDP supports IPv4 standard access lists only.


    Note

    Label advertisement control is also referred to as LDP outbound label filtering.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to disable advertisement of all locally assigned labels to all peers: 


RP/0/RP0/CPU0:router(config-ldp)# label advertise
RP/0/RP0/CPU0:router(config-ldp-lbl-advt)# disable

The following example shows how to send labels only for prefixes 10.1.1.0 and 20.1.1.0 to all peers: 


RP/0/RP0/CPU0:router(config)# ipv4 access-list pfx_acl_1
RP/0/RP0/CPU0:router(config-ipv4-acl)# permit 10.1.1.0
RP/0/RP0/CPU0:router(config-ipv4-acl)# permit 20.1.1.0

RP/0/RP0/CPU0:router(config-ldp)# label advertise
RP/0/RP0/CPU0:router(config-ldp-lbl-advt)# disable
RP/0/RP0/CPU0:router(config-ldp-lbl-advt)# for pfx_acl_1

The following example shows how to send labels for prefix 10.0.0.0 to peers 10.1.1.1 and 10.2.2.2, labels for prefix 20.0.0.0 to peer 20.1.1.1, and labels for all other prefixes to all other peers: 


RP/0/RP0/CPU0:router(config)# ipv4 access-list pfx_acl_10
RP/0/RP0/CPU0:router(config-ipv4-acl)# permit 10.0.0.0
  
RP/0/RP0/CPU0:router(config)# ipv4 access-list pfx_acl_20
RP/0/RP0/CPU0:router(config-ipv4-acl)# permit 20.0.0.0
  
RP/0/RP0/CPU0:router(config)# ipv4 access-list peer_acl_10
RP/0/RP0/CPU0:router(config-ipv4-acl)# permit 10.1.1.1
RP/0/RP0/CPU0:router(config-ipv4-acl)# permit 10.2.2.2
  
RP/0/RP0/CPU0:router(config)# ipv4 access-list peer_acl_20
RP/0/RP0/CPU0:router(config-ipv4-acl)# permit 20.1.1.1 
  
RP/0/RP0/CPU0:router(config-ldp)# label advertise
RP/0/RP0/CPU0:router(config-ldp-lbl-advt)# for pfx_acl_10 to peer_acl_10
RP/0/RP0/CPU0:router(config-ldp-lbl-advt)# for pfx_acl_20 to peer_acl_20

Note

To advertise pfx_acl_10 to peer_acl_10 and pfx_acl_20 to peer_acl_20 and disable all other advertisements to all other peers, include the disable keyword with the label advertise command.

The following example shows how to use the interface keyword to advertise /32 IP address for HundredGigE 0/0/0/1: 


RP/0/RP0/CPU0:router(config-ldp)# label advertise
RP/0/RP0/CPU0:router(config-ldp-lbl-advt)# interface POS 0/1/0/0

label allocate

To control allocation of local label only for a set of prefixes, use the label allocate command in MPLS LDP configuration mode. To return to the default behavior, use the no form of this command.

label allocate for {prefix-acl | host-routes}

no label allocate

Syntax Description

for

Specifies set of prefixes for which local label needs to be allocated.

prefix-acl

IP access-list name or number. Range is from 1 to 99.

host-routes

Allocates the label for host routes only.

Command Default

LDP allocates local label for all learned routes (prefixes).

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

Local label allocation control lets you override the default label allocation policy and provides many benefits, including reduced memory usage and fewer forwarding and network updates.

By default, LDP allocates local labels for all learned routes. There are times when you may want to limit label allocation for a given set of prefixes; for example, when using LDP in the core network to provide MPLS transport from one edge to another edge. In such cases, it is necessary to set up label switch packets (LSPs) for Loopback /32 addresses for provider edge (PE) routers (rendering it unnecessary to allocate and advertise local labels for other Interior Gateway Protocol (IGP) prefixes).

LDP supports IPv4 standard access lists only.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to configure LDP to limit allocation of local labels to prefixes 192.168.1.1, 192.168.2.2, and 192.168.3.3 only: 


RP/0/RP0/CPU0:router(config)# ipv4 access-list pfx_acl_1
RP/0/RP0/CPU0:router(config-ipv4-acl)# permit 192.168.1.1
RP/0/RP0/CPU0:router(config-ipv4-acl)# permit 192.168.2.2
RP/0/RP0/CPU0:router(config-ipv4-acl)# permit 192.168.3.3
  
RP/0/RP0/CPU0:router(config-ldp)# label allocate for pfx_acl_1

log graceful-restart

To set up notification describing graceful-restart (GR) session events, use the log graceful-restart command in MPLS LDP configuration mode. To return to the default behavior, use the no form of this command.

log graceful-restart

no log graceful-restart

Syntax Description

This command has no arguments or keywords.

Command Default

No default behavior or values

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

Use the log graceful-restart command to receive a syslog/console message when a graceful restart-related session event occurs, including LDP graceful restart session disconnection, reconnection, and timeout.


Note

A logging message is issued upon graceful restart session events.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to enable logging messages for graceful restart session events: 


RP/0/RP0/CPU0:router(config-ldp)# log graceful-restart

The following sample output shows the logging events that can be displayed on the console: 


RP/0/RP0/CPU0:router: mpls_ldp[340]: %ROUTING-LDP-5-GR : GR session 4.4.4.4:0 (instance 1) disconnected 
  
RP/0/RP0/CPU0:router: mpls_ldp[340]: %ROUTING-LDP-5-GR : GR session 4.4.4.4:0 (instance 2) reconnected 
  
RP/0/RP0/CPU0:router: mpls_ldp[340]: %ROUTING-LDP-5-GR : GR session 5.5.5.5:0 (instance 3) timed out
  
RP/0/RP0/CPU0:router: mpls_ldp[336]: %ROUTING-LDP-5-GR_RESTART_COMPLETE : GR forwarding state hold timer has expired

log neighbor

To enable logging of notices describing session changes, use the log neighbor command in MPLS LDP configuration mode. To return to the default behavior, use the no form of this command.

log neighbor

no log neighbor

Syntax Description

This command has no arguments or keywords.

Command Default

No default behavior or values

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

Use the log neighbor command to receive a syslog or console message when a neighbor goes up or down.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to enable logging messages for neighbor session up and down events: 


RP/0/RP0/CPU0:router(config-ldp)# log neighbor

Note

A logging message is issued when an LDP session state changes from up to down (and down to up).

The following shows sample output of logging events that can be displayed on the console: 


RP/0/RP0/CPU0:router:10 21:11:32.111:mpls_ldp[113]:%LDP-5-NBR_CHANGE: Nbr 10.44.44.44:0, DOWN

log nsr

To enable logging of nonstop routing (NSR) synchronization events, use the log nsr command in MPLS LDP configuration mode. To return to the default behavior, use the no form of this command.

log nsr

no log nsr

Syntax Description

This command has no arguments or keywords.

Command Default

No default behavior or values

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to enable logging of NSR synchronization events: 


RP/0/RP0/CPU0:router(config-ldp)# log nsr

log session-protection

To enable logging of notices describing LDP session protection events, use the log session-protection command in MPLS LDP configuration mode. To return to the default behavior, use the no form of this command.

log session-protection

no log session-protection

Syntax Description

This command has no arguments or keywords.

Command Default

No default behavior or values

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

Use the log session-protection command to receive a syslog or console message when LDP session protection event occurs. These events include LDP session protection initiation, recovery, and timeout.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to enable logging messages for session protection events: 


RP/0/RP0/CPU0:router(config-ldp)# log session-protection

Note

Logging messages are issued when session protection events occur.

The following sample output shows the logging events that are displayed on the console: 


RP/0/RP0/CPU0:router:Apr 21 12:15:01.742: mpls_ldp[315]:%ROUTING-LDP-5-SESSION_PROTECTION: Session hold up initiated for peer 4.4.4.4:0
  
RP/0/RP0/CPU0:router:Apr 21 12:18:04.987: mpls_ldp[315]:%ROUTING-LDP-5-SESSION_PROTECTION: Session recovery succeeded for peer 4.4.4.4:0

make-before-break

To enable Multicast Label Distribution Protocol (MLDP) make-before-break (MBB) support, use make-before-break command in MPLS LDP MLDP configuration.

address-family ipv4 make-before-break [delay seconds | route-policy name]

Syntax Description

delay seconds

(Optional) Specifies the MBB forwarding delay in seconds. Range is 0 to 600.

route-policy name

(Optional) Specifies the route policy name.

Command Default

No default behavior or values

Command Modes

MPLS LDP MLDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID Operation

mpls-ldp

read, write

Examples

The following example shows how to enable MLDP MBB support: 



RP/0/RP0/CPU0:router(config-ldp-mldp)# address-family ipv4 make-before-break

maximum interfaces (MPLS LDP)

To configure upper limit on maximum number of LDP configured interfaces, use the maximum interfaces command in MPLS LDP configuration mode. To return to the default behavior, use the no form of this command.

maximum interfaces number

no maximum interfaces

Syntax Description

number

Maximum number of LDP configured interfaces. Range Default is 1 to 250 interfaces 800.

Command Default

By default, you can enable LDP on up to 100 interfaces.

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to set an upper limit of 150 as maximum number of LDP interfaces, which can be enabled on the box: 


RP/0/RP0/CPU0:router(config-ldp)# maximum interfaces 150

mpls ldp

To enter MPLS Label Distribution Protocol (LDP) configuration mode, use the mpls ldp command in

XR Config mode

mode.

mpls ldp

Syntax Description

This command has no arguments or keywords.

Command Default

No default behavior or values

Command Modes

XR Config mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to MPLS LDP configuration mode: 


RP/0/RP0/CPU0:router# configure
RP/0/RP0/CPU0:router(config)# mpls ldp
RP/0/RP0/CPU0:router(config-ldp)

neighbor dual-stack transport-connection max-wait

To configure the maximum time (in seconds) the preferred address family connection must wait to establish before resorting to non-preferred address family or FCFS, use the neighbor dual-stack transport-connection max-wait command in MPLS LDP configuration mode.

neighbor dual-stack transport-connection max-wait seconds

Syntax Description

seconds

Specifies the maximum wait time in seconds for preferred transport connection establishment. The range is from 0 to 60. Zero indicates no preference.

Command Default

No default behavior or values

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID Operation

mpls ldp

read, write

Examples

The following example shows how to configure the maximum wait time for preferred transport connection establishment: 


RP/0/0/CPU0:ios#configure
RP/0/0/CPU0:ios(config)#mpls ldp
RP/0/0/CPU0:ios(config-ldp)#neighbor dual-stack transport-connection max-wait 5

neighbor dual-stack transport-connection prefer ipv4 for-peers

To configure preferred transport as IPv4 for set of peers to establish TCP connection in a dual-stack setup, use the neighbor dual-stack transport-connection prefer ipv4 for-peers command in the MPLS LDP configuration mode.

neighbor dual-stack transport-connection prefer ipv4 for-peers access-list

Syntax Description

access-list

IPv4 access-list (specifies peer LSR IDs in A.B.C.D format).

Command Default

No default behavior or values

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID Operation

mpls ldp

read, write

Examples

The following example shows how to configure preferred transport as IPv4 for set of peers: 


RP/0/0/CPU0:ios#configure
RP/0/0/CPU0:ios(config)#mpls ldp
RP/0/0/CPU0:ios(config-ldp)#neighbor dual-stack transport-connection prefer ipv4 for-peers 3.3.3.3

neighbor password

To configure password authentication using the TCP Message Digest 5 (MD5) option for a neighbor, use the neighbor password command in MPLS LDP configuration mode. To return to the default behavior, use the no form of this command.

[vrf vrf-name] neighbor ldp-id password {clear | disable | encrypted password }

no [vrf vrf-name] neighbor ldp-id password

Syntax Description

vrf vrf-name

(Optional) Specifies the VRF name.

ldp-id

LDP ID of neighbor in A.B.C.D:0 format.

clear

Clears the password for the encyrption parameter to specify that an unencrypted password will follow.

disable

Disables the global password from the specified neighbor.

encrypted

Specifies that an encrypted password will follow.

password

(Clear text) Encrypted or unencrypted password string.

Command Default

LDP sessions are negotiated without any password (and MD5).

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

This security feature is enabled per neighbor, so that a session establishment attempt is allowed only when a password match has been configured. This option must be configured so that both peer passwords match.

To override the default password for a specific neighbor, use the neighbor ldp-id password command, where the ldp-id argument is the LDP ID of the neighbor.


Note

The global default password must be configured before being able to override the default password for a specific neighbor.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to configure the password abc for neighbor 10.20.20.20 and how to clear it: 


RP/0/RP0/CPU0:router(config-ldp)# neighbor 10.20.20.20:0 password clear abc

neighbor password disable

To override an individual neighbor which requires no password, use the neighbor password disable command in MPLS LDP configuration mode.

neighbor IP-address password disable

Syntax Description

IP-address

Neighbor IP address.

Command Default

LDP sessions are negotiated without any password (and MD5).

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

The system uses the global password to compute each neighbor's effective password and overrides the global password with the individual neighbor password, if configured. The session remains stable if you shift from an individual neighbor password to an equal global password. However, if the effective password changes during configuration, the session might be rendered unstable.


Note

You must configure the password for an individual neighbor using the neighbor’s LSR ID.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to override the individual password abc, for the neighbor: 


RP/0/RP0/CPU0:router(config-ldp)# neighbor 10.20.20.20 password disable abc
RP/0/RP0/CPU0:router(config-ldp)#

neighbor targeted

To configure transmission of targeted hellos toward a neighbor for setting up an LDP session, use the neighbor targeted command in MPLS LDP configuration mode. To return to the default behavior, use the no form of this command.

address-family {ipv4 | ipv6} neighbor Ip-address targeted

no address-family {ipv4 | ipv6} neighbor ip-address targeted

Syntax Description

ip-address

Neighbor IP address.

ipv4

Specifies IP version 4 address family.

ipv6

Specifies IP version 6 address family.

Command Default

No default behavior or values

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to set up a targeted discovery session for neighbor 200.1.1.1: 


RP/0//CPU0:router(config-ldp)# neighbor 200.1.1.1 targeted

nsr (MPLS-LDP)

To configure nonstop routing for LDP protocols in the event of a disruption in service, use the nsr command in MPLS LDP configuration mode. To return to the default behavior, use the no form of this command.

nsr

no nsr

Syntax Description

This command has no arguments or keywords.

Command Default

By default, MPLS LDP NSR is disabled.

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

A disruption in service may include any of the following events:

  • Route Switch Processor (RSP) switchover
  • Route processor (RP) or distributed route processor (DRP) failover
  • LDP process restart
  • In-service system upgrade (ISSU)
  • Minimum disruption restart (MDR)

Enabling NSR causes events such as these to be invisible to the routing peers and provide minimal service disruption.


Note

The LDP Process restart is supported by NSR only if the NSR process-failures switchover is configured, else the process restart causes the session to be unstable.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to enable MPLS LDP NSR: 


RP/0/RP0/CPU0:router# configure
RP/0/RP0/CPU0:router(config)# mpls ldp
RP/0/RP0/CPU0:router(config-ldp)# nsr

recursive-fec

To enable Multicast Label Distribution Protocol (MLDP) recursive-fec support, use recursive-fec command in MPLS LDP MLDP configuration.

address-family ipv4 recursive-fec [route-policy name]

Syntax Description

route-policy name

(Optional) Specifies the route policy name.

Command Default

No default behavior or values

Command Modes

MPLS LDP MLDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID Operation

mpls-ldp

read

Examples

The following example shows how to enable MLDP recursive fec support: 



RP/0/RP0/CPU0:router(config-ldp-mldp)# address-family ipv4 recursive-fec

redistribute (MPLS LDP)

To redistribute routes from a Border Gateway Protocol (BGP) autonomous system into an MPLS LDP, use the redistribute command in MPLS LDP configuration mode. To disable route redistribution, use the no form of this command.

redistribute bgp {as as-number | advertise-to access-list-name}

no redistribute bgp {as as-number | advertise-to access-list-name}

Syntax Description

bgp

Redistributes information from BGP protocols.

as as-number

Specifies the BGP autonomous system number.

advertise-to access-list

Advertise the redistributed route information.

Command Default

No default behavior or values

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID Operation

MPLS LDP

read, write

Examples

The following example shows how to redistribute BGP information to MPLS LDP peers: 


RP/0/RP0/CPU0:router(config)# mpls ldp
RP/0/RP0/CPU0:router(config-ldp)# redistribute bgp ?
  advertise-to  IP access list specifying LDP peers to advertise
  as            BGP AS-number
  <cr>          
RP/0/RP0/CPU0:router(config-ldp)# redistribute bgp as 10000
RP/0/RP0/CPU0:router(config-ldp)# commit

RP/0/RP0/CPU0:router# show run mpls ldp | b bgp
 bgp
   as 10000
  !

router-id (MPLS LDP)

To specify an IPv4 address to act as the router ID, use the router-id command in MPLS LDP configuration mode. To return to the default behavior, use the no form of this command.

[vrf vrf-name] router-id lsr-id

no [vrf vrf-name] router-id

Syntax Description

vrf vrf-name

(Optional) Specifies the VRF name.

lsr-id

LSR ID in A.B.C.D format.

Command Default

LDP uses router ID as determined by global router ID agent, IP Address Repository Manager (IP ARM).

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

LDP uses the router ID from different sources in the following order:

  1. Configured LDP router ID.
  2. Global router ID (if configured).

  3. Calculated (computed) using the primary IPv4 address of the highest numbered configured loopback address. We recommend configuring at least one loopback address.


Note

We recommend that you configure an IP address for the LDP router-id to avoid unnecessary session flaps.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to specify an LSR ID as the router ID: 


RP/0/RP0/CPU0:router(config-ldp)#router-id 10.0.0.1

router ospf

To enable Open Shortest Path First (OSPF) LDP IGP synchronization for a specific VRF or a specific VRF area or a specific VRF area interface, use the router ospf command in XR Config mode.

router ospf process-id [vrf vrf-name [area {area-id | ip-address}] [interface type interface-path-id] mpls ldp sync [disable]]

Syntax Description

process-id

Internally used identification parameter for an OSPF routing process. It is locally assigned and can be any positive integer. A unique value is assigned for each OSPF routing process.

vrf vrf-name

(Optional) Specifies the name of the VRF instance to associate with OSPF VRF processes.

area

(Optional) Enters the OSPF area configuration submode.

area-id

Specifies the OSPF area ID as a decimal value.

ip-address

Specifies the OSPF area ID as an IP address in A.B.C.D format.

interface

(Optional) Enters the OSPF interface configuration submode.

type

Interface type. For more information, use the question mark (?) online help function.

interface-path-id

Physical interface or a virtual interface.

Note 

Use the show interfaces command to see a list of all possible interfaces currently configured on the router.

For more information about the syntax for the router, use the question mark (?) online help function.

sync

Enables LDP IGP synchronization on the specified interface.

disable

(Optional) Disables MPLS LDP synchronization.

Command Default

No default behavior or values

Command Modes

XR Config mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID Operation

mpls-ldp

read, write

Examples

The following example shows how to enable OSPF LDP IGP synchronization for a specific VRF: 



RP/0/RP0/CPU0:router# configure
RP/0/RP0/CPU0:router(config)#router ospf 109
RP/0/RP0/CPU0:router(config-ospf)#

session protection

To enable the LDP session protection feature for keeping LDP peer session up by means of targeted discovery following the loss of link discovery with a peer, use the session protection command in MPLS LDP configuration mode. To return to the default behavior, use the no form of this command.

session protection [duration seconds | infinite] [for peer-acl]

no session protection

Syntax Description

duration seconds

(Optional) Specifies the protection duration, that is, the number of seconds that targeted discovery should continue following the loss of link discovery to a neighbor. Range is 30 to 2147483.

infinite

(Optional) Specifies session protection to last forever after loss of link discovery.

for peer-acl

(Optional) Specifies set of LDP peers for which session protection is to be enabled.

Command Default

By default, session protection is disabled. When enabled without peer-acl and duration, session protection is provided for all LDP peers and continues for 24 hours after a link discovery loss.

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

LDP session protection feature allows you to enable the automatic setup of targeted hello adjacencies with all or a set of peers and specify the duration for which session needs to be maintained using targeted hellos after loss of link discovery.

LDP supports only IPv4 standard access lists.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to enable session protection for all discovered peers with unlimited duration to maintain the session after link discovery loss: 


RP/0/RP0/CPU0:router(config-ldp)# session protection

The following example shows how to enable session protection for a set of peers (as permitted by a peer ACL) with duration of 30 seconds to maintain the session after link discovery loss: 


RP/0/RP0/CPU0:router(config-ldp)# session protection for peer_acl duration 30

show mpls ldp backoff

To display information about the configured session setup backoff parameters and any potential LDP peers with which session setup attempts are being throttled, use the show mpls ldp backoff command in XR EXEC mode.

show mpls ldp [vrf vrf-name] backoff [location node-id | standby]

Syntax Description

vrf vrf-name

(Optional) Displays the VRF information for the specified VRF.

location node-id

(Optional) Displays location information for the specified node ID.

standby

(Optional) Displays standby-node-specific information.

Command Default

No default behavior or values

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

You must enable the MPLS LDP application to use the show mpls ldp backoff command.

Task ID

Task ID

Operations

mpls-ldp

read

Examples

The following shows a sample output from the show mpls ldp backoff command: 


RP/0/RP0/CPU0:router# show mpls ldp backoff
  
Backoff Time:
  Initial:15 sec, Maximum:120 sec
  
Backoff Table: (2 entries)
  
  LDP Id               Backoff (sec)  Waiting (sec)   
  -------------------- -------------- ----------------
  33.33.33.33:0          15               15
  11.11.11.11:0          30               30

This table describes the significant fields shown in the display.

Table 1. show mpls ldp backoff Command Field Descriptions

Field

Description

Backoff Time

Initial and maximum backoff time parameters, in seconds.

Backoff Table

List of discovered LDP neighbors for which session setup is being delayed because of previous failures to establish a session due to incompatible configuration. The backoff table incorporates the following information:
LDP Id

Identifies the LDP neighbors.

Backoff (sec)

Specifies the time that the session setup is delayed.

Waiting (sec)

Specifies an approximate time the session setup has been delayed.

show mpls ldp bindings

To display the contents of the Label Information Base (LIB), use the show mpls ldp bindings command in XR EXEC mode command.

show mpls ldp [afi-all] [vrf all] [vrf vrf-name] [ipv4 | ipv6] bindings [prefix/ length ] [advertisement-acls] [brief] [detail] [local] [local-label label [to label]] [local-only] [neighbor address] [remote-only] [remote-label label [to label]] [summary] [location node-id | standby] [all]

Syntax Description

afi-all

(Optional) Displays all address families.

vrf all

(Optional) Displays all LDP configured VRFs.

vrf vrf-name

(Optional) Displays the VRF information for the specified VRF.

ipv4

(Optional) Specifies IP version 4 address family.

ipv6

(Optional) Specifies IP version 6 address family.

prefix

(Optional) Destination prefix, written in A.B.C.D format.

length

(Optional) Network mask length, in bits. Range is 0 to 32.

advertisement-acls

(Optional) Displays the label bindings as applied for (advertisement) outbound label filtering ACLs.

brief

(Optional) Displays all the prefixes in the LDP database.

detail

(Optional) Displays the total counts of advertised-to and remote-binding peers in IP address sort order, with remote bindings in tabular format.

local

(Optional) Displays the local label bindings.

local-label label [to label ]

(Optional) Displays entries matching local label values. Add the label to label argument to indicate the label range.

local-only

(Optional) Displays binding matches with a local label only.

neighbor address

(Optional) Displays the label bindings assigned by the selected neighbor.

remote-only

(Optional) Displays bindings matches with a remote label only.

remote-label label [to label ]

(Optional) Displays entries matching the label values assigned by a neighbor router. Add the label to label argument to indicate the label range. Range is from 0 to 2147483647.

summary

(Optional) Displays a summary of the contents of the Label Information Base (LIB).

location node-id

(Optional) Displays location information for the specified node ID.

standby

(Optional) Displays standby-node-specific information.

all

(Optional) Displays the aggregate summary across LDP processes and all VRFs.

Command Default

No default behavior or values

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

The show mpls ldp bindings command displays local and remote label bindings learned from neighbors for non-BGP routes (such as IGP prefixes and static routes).

You can choose to view the entire database or a subset of entries according to the following criteria:

  • Prefix
  • Input or output label values or ranges
  • Neighbor advertising the label

Note

The show mpls ldp bindings summary command displays summarized information from the LIB and is used when testing scalability or when deployed in a large scale network.

Task ID

Task ID

Operations

mpls-ldp

read

Examples

The following sample output displays the contents of the LIB for the default routing domain: 


RP/0/RP0/CPU0:router# show mpls ldp bindings
  
     5.41.0.0/16 , rev 4 
          local binding: label:IMP-NULL
          No remote bindings
  5.43.9.98/32 , rev 6 
          local binding: label:IMP-NULL
          No remote bindings
  10.10.2.0/24 , rev 12 
          local binding: label:IMP-NULL
          remote bindings : 
              lsr:10.255.255.255:0, label:16 
              lsr:10.256.256.256:0, label:IMP-NULL 
  10.10.3.0/24 , rev 10 
          local binding: label:IMP-NULL
          remote bindings : 
              lsr:10.255.255.255:0, label:IMP-NULL 
              lsr:10.256.256.256:0, label:22 
  22.22.22.22/32 , rev 14 
          local binding: label:16
          remote bindings : 
              lsr:10.255.255.255:0, label:17 
              lsr:10.256.256.256:0, label:IMP-NULL
  33.33.33.33/32 , rev 2 
          local binding: label:IMP-NULL
          remote bindings : 
              lsr:10.255.255.255:0, label:18 
              lsr:10.256.256.256:0, label:23

The following sample output shows detailed information for the total counts of advertised-to and remote-binding peers in IP address sort order, with remote bindings for 150.150.150.150/32: 


RP/0/RP0/CPU0:router# show mpls ldp bindings 150.150.150.150/32 detail
  
  150.150.150.150/32, rev 2
       Local binding: label: IMP-NULL
         Advertised to: (6 peers)
           120.120.120.120:0  130.130.130.130:0  150.150.150.1:0  150.150.150.2:0
           150.150.150.3:0    150.150.150.4:0
       Remote bindings:    (3 peers)
           Peer                Label
  -----------------         --------
         120.120.120.120:0     27018
         130.130.130.130:0     26017
         160.160.160.160:0     27274

The following sample output specifies a network number and displays labels learned from label switched router (LSR) 10.255.255.255 for all networks. The neighbor keyword is used to suppress the output of remote labels learned from other neighbors: 


RP/0/RP0/CPU0:router# show mpls ldp bindings neighbor 10.255.255.255
  
  10.10.2.0/24 , rev 12 
          local binding: label:IMP-NULL
          remote bindings : 
              lsr:10.255.255.255, label:16 
  10.10.3.0/24 , rev 10 
          local binding: label:IMP-NULL
          remote bindings : 
              lsr:10.255.255.255:0, label:IMP-NULL 
  22.22.22.22/32 , rev 14 
          local binding: label:16
          remote bindings : 
              lsr:10.255.255.255:0, label:17 
  33.33.33.33/32 , rev 2 
          local binding: label:IMP-NULL
          remote bindings : 
              lsr:10.255.255.255:0, label:18 
  44.44.44.44/32 , rev 16 
          local binding: label:17
          remote bindings : 
              lsr:10.255.255.255:0, label:IMP-NULL

This table describes the significant fields shown in the display.

Table 2. show mpls ldp bindings and show mpls ldp bindings neighbor Command Field Descriptions

Field

Description

a.b.c.d/n

IP prefix and mask for a particular destination (network/mask).

rev

Revision number (rev) that is used internally to manage label distribution for this destination.

local binding

Locally assigned label for a prefix.

remote bindings

Outgoing labels for this destination learned from other LSRs.1 Each item in this list identifies the LSR from which the outgoing label was learned and reflects the label associated with that LSR. Each LSR in the transmission path is identified by its LDP identifier.

(rewrite)

Binding has been written into MPLS forwarding and is in use.

(no route)

Route is not valid. LDP times it out before the local binding is deleted.

1 Label switched routers.

The following sample output summarizes the content by using the summary keyword: 


RP/0/RP0/CPU0:router# show mpls ldp bindings summary
  
  LIB Summary:
    Total Prefix   : 20 
    Revision No    : Current:34, Advertised:34
    Local Bindings : 14
        NULL    : 10 (implicit:10, explicit:0)
        Non-NULL: 4 (lowest:48, highest:51)
    Remote Bindings: 24

This table describes the significant fields shown in the display.

Table 3. show mpls ldp bindings summary Command Field Descriptions

Field

Description

Total Prefix

Number of prefixes (routes) known to LDP LIB. All invalid and timed-out routes display as no-routes.

Revision No

Current revision number of LIB entries as well as the minimum revision number that has been advertised to all peers.

Local Bindings

Total number of local bindings, with information on how many of them are Null, non-null, and lowest/highest label assigned or allocated by LDP.

Remote Bindings

Number of remote bindings.

The following sample output shows the access-list advertisement: 


RP/0/RP0/CPU0:router# show mpls ldp bindings advertisement-acls
  
  Advertisement Spec: 
          Prefix ACL = 'pfx_11'
          Prefix ACL = 'pfx_22'
          Prefix ACL = 'pfx_40_1'; Peer ACL = 'peer_11'
  
  5.41.0.0/16 , rev 82 
  11.11.11.11/32 , rev 69 
          Advert ACL(s): Prefix ACL 'pfx_11' 
  20.20.20.20/32 , rev 83 
  22.22.22.22/32 , rev 78 
          Advert ACL(s): Prefix ACL 'pfx_22' 
  40.1.1.0/24 , rev 79 
          Advert ACL(s): Prefix ACL 'pfx_40_1'; Peer ACL 'peer_11'

This table describes the significant fields shown in the display.

Table 4. show mpls ldp bindings advertisement-acls Command Field Descriptions

Field

Description

Advertisement Spec

Lists all prefix and peer access-lists used as outbound label advertisement control.

Advert ACL(s)

Lists the first matching rule (if any) for the prefix entry for outbound label advertisement control (for prefix-acl).

The following sample output shows all the prefixes in the LDP database using the brief keyword: 


RP/0/RP0/CPU0:router# show mpls ldp bindings brief
  
  Prefix                Local Advertised Remote Bindings
                        Label (peers)         (peers)
  ------------------ -------- ---------- ---------------
  1.1.2.2/32            -          0           1
  1.2.3.4/32            16010      396         0
  4.4.4.4/32            16004      396         3
  10.0.0.0/24           19226      396         395

The following sample output shows that the binding matches with a local label: 


RP/0/RP0/CPU0:router# show mpls ldp bindings local-only
  
  10.12.32.2/32, rev 4
          Local binding: label: IMP-NULL
          No remote bindings

The following sample output shows that the binding matches with a remote label: 


RP/0/RP0/CPU0:router# show mpls ldp bindings remote-only
  
  10.26.4.0/24, rev 0
          No local binding
          Remote bindings: (1 peers)
              Peer                Label   
              -----------------   --------
              10.6.6.6:0          IMP-NULL
  10.43.4.0/24, rev 0
          No local binding
          Remote bindings: (1 peers)
              Peer                Label   
              -----------------   --------
              10.4.4.4:0          IMP-NULL
  10.46.4.0/24, rev 0
          No local binding
          Remote bindings: (2 peers)
              Peer                Label   
              -----------------   --------
              10.4.4.4:0          IMP-NULL
              10.6.6.6:0          IMP-NULL

show mpls ldp capabilities

To display the database capability information for an LDP session, use the show mpls ldp capabilities command in XR EXEC mode.

show mpls ldp [vrf vrf-name] capabilities [detail] [location node-id | standby]

Syntax Description

vrf vrf-name

(Optional) Displays the VRF information for the specified VRF.

detail

(Optional) Displays detailed database capability information for an LDP session.

location node-id

(Optional) Displays location information for the specified node ID.

standby

(Optional) Displays standby node-specific information.

Command Default

No default behavior or values

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 6.0

This command was introduced

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID Operation

mpls-ldp

read

Examples

The following shows a sample output from the show mpls ldp capabilities command: 


RP/0/RP0/CPU0:router# show mpls ldp capabilities

  Type     Description                                Owner       
  ------   ----------------------------------------   ------------
  0x50b    Typed Wildcard FEC                         LDP         
  0x3eff   Cisco IOS-XR                               LDP         
  0x508    MP: Point-to-Multipoint (P2MP)             mLDP        
  0x509    MP: Multipoint-to-Multipoint (MP2MP)       mLDP        
  0x703    P2MP PW                                    L2VPN-AToM

show mpls ldp discovery

To display the status of the LDP discovery process, use the show mpls ldp discovery command in XR EXEC mode.

show mpls ldp [afi-all] [vrf all] [vrf vrf-name] [ipv4 | ipv6] discovery [lsr-id | ldp-id] [type interface-path-id | brief | link | targeted | summary [all]] [detail] [location node-id | standby]

Syntax Description

afi-all

(Optional) Displays all address families.

vrf all

(Optional) Displays all LDP configured VRFs.

vrf vrf-name

(Optional) Displays the VRF information for the specified VRF.

ipv4

(Optional) Specifies IP version 4 address family.

ipv6

(Optional) Specifies IP version 6 address family.

lsr-id

(Optional) Neighbor LSR ID in A.B.C.D format.

ldp-id

(Optional) Neighbor LDP ID in A.B.C.D: format.

type

(Optional) Interface type. For more information, use the question mark (?) online help function.

interface-path-id

Physical interface or a virtual interface.

Note 

Use the show interfaces command to see a list of all possible interfaces currently configured on the router.

For more information about the syntax for the router, use the question mark (?) online help function.

brief

(Optional) Displays concise information about a specified LDP-enabled interface.

link

(Optional) Displays link information for LDP discovery.

targeted

(Optional) Displays targeted information for LDP discovery.

summary

(Optional) Displays summarized information for LDP discovery.

all

(Optional) Displays the aggregate summary across LDP processes and all VRFs.

detail

(Optional) Displays detailed information (including, inbound label filtering, session KAs, and session protection state) for an LDP session.

location node-id

(Optional) Displays location information for the specified node ID.

standby

(Optional) Displays standby node-specific information.

Command Default

No default behavior or values

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

The show mpls ldp discovery command shows both link discovery and targeted discovery. When no interface filter is specified, this command generates a list of interfaces running the LDP discovery process. This command also displays neighbor discovery information for the default routing domain.

Task ID

Task ID

Operations

mpls-ldp

read

Examples

The following sample output is from the show mpls ldp discovery command: 


RP/0/RP0/CPU0:router# show mpls ldp discovery
  
  Local LDP Identifier: 10.44.44.44:0
  Discovery Sources:
    Interfaces:
       HundredGigE 0/1/0/0 : xmit/recv
        LDP Id: 10.33.33.33:0, Transport address: 10.33.33.33
            Hold time: 15 sec (local:15 sec, peer:15 sec)

This table describes the significant fields shown in the display.

Table 5. show mpls ldp discovery Command Field Descriptions

Field

Description

Local LDP Identifier

LDP identifier for the local router. An LDP identifier is a 6-byte construct displayed in the form IP address:number. By convention, the first 4 bytes of the LDP identifier constitute the router ID; integers, starting with 0, constitute the final two bytes of the IP address:number construct.

Interfaces

Interfaces engaged in LDP discovery activity, as follows:
xmit field

Indicates that the interface is transmitting LDP discovery hello packets.

recv field

indicates that the interface is receiving LDP discovery hello packets.

The LDP identifiers indicate the LDP neighbors discovered on the interface.

Transport Address

Address associated with this LDP peer (advertised in hello messages).

LDP Id

LDP identifier of the LDP peer.

Hold time

State of the forwarding hold timer and its current value.

The following sample output summarizes information for LDP discovery by using the summary keyword: 


RP/0/RP0/CPU0:router# show mpls ldp discovery summary
  
  LDP Identifier: 139.0.0.1:0
  Interfaces:
    Configured: 2
    Enabled   : 1
  Discovery:
    Hello xmit: 1 (1 link)
    Hello recv: 1 (1 link)

This table describes the significant fields shown in the display.

Table 6. show mpls ldp discovery summary Command Field Descriptions

Field

Description

LDP Identifier

The LDP identifier for the local router.

Interfaces

Summary of interfaces engaged in LDP activity.
Configured

Number of interfaces configured for LDP.

Enabled

Number of interfaces on which LDP is actively enabled and is thus sending LDP hellos. An interface configured for LDP is enabled only if running IP and not in the down state.

Discovery

Summary of LDP discovery process.
Hello xmit

Number of local LDP discovery sources (including link and targeted hellos) emitting LDP hellos.

Hello recv

Number of discovered hello sources via link or targeted hello mechanics.

The following sample output shows the MPLS LDP discovery hello information in brief form: 


RP/0/RP0/CPU0:router# show mpls ldp discovery brief
  
  Local LDP Identifier: 192.168.0.3:0
  
  Discovery Source         VRF Name       Peer LDP Id          Holdtime   Session
  -----------------------  ------------   -------------------  ---------  ----------
  PO0/3/0/2                default        192.168.0.1:0        15         Y

The following sample shows the MPLS LDP afi-all discovery brief command output: 


RP/0/0/CPU0:router#show mpls ldp afi-all discovery brief 

Local LDP Identifier: 192.168.0.1:0

Discovery Source     AFI  VRF Name         Peer LDP Id          Holdtime Session
-------------------- ---- ---------------- -------------------- -------- -------
PO0/3/0/0            IPv6 default          192.168.0.2:0           15       Y   
                     IPv4 default          192.168.0.2:0           15       Y   
PO0/3/0/1            IPv4 default          192.168.0.3:0           15       Y   
PO0/3/0/2            IPv4 default          192.168.0.4:0           15       Y   
PO0/3/0/3            IPv6 default          192.168.0.3:0           15       Y   
PO0/3/0/4            IPv6 default          192.168.0.5:0           15       Y

show mpls ldp forwarding

To display the Label Distribution Protocol (LDP) forwarding state installed in MPLS forwarding, use the show mpls ldp forwarding command in XR EXEC mode mode.

show mpls ldp [afi-all] [vrf all] [vrf vrf-name] [ipv4 | ipv6] forwarding [prefix/ length] [fast-reroute] [detail] [next-hop {address ip-address | interface interface-path-id | label label-value | neighbor ldp-id | unlabelled}] [local-label label-value] [location node-id | summary | standby] [all]

Syntax Description

afi-all

(Optional) Displays all address families.

vrf all

(Optional) Displays all LDP configured VRFs.

vrf vrf-name

(Optional) Displays the VRF information for the specified VRF.

ipv4

(Optional) Specifies IP version 4 address family.

ipv6

(Optional) Specifies IP version 6 address family.

prefix

(Optional) Destination prefix, written in A.B.C.D format.

length

(Optional) Network mask length, in bits. Range is 0 to 32.

detail

(Optional) Displays detailed informati on for the LDP timestamp that is used for the routing and forwarding update.

fast-reroute

(Optional) Displays the prefix that is LFA FRR protected in nature.

next-hop

Matches prefixes by next-hop IP address.

local-label label-value

(Optional) Displays the prefix with the specified local label. Range is from 0 to 1048575.

neighbor

Matches prefixes with a path through specified LDP neighbor.

unlabelled

Matches prefixes containing unlabelled paths.

location node-id

(Optional) Displays location information for the specified node ID.

summary

(Optional) Displays the summary information for the LDP forwarding information base (LFIB).

standby

(Optional) Displays standby-node specific information.

all

(Optional) Displays the aggregate summary across LDP processes and all VRFs.

Command Default

No default behavior or values

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

The show mpls ldp forwarding command displays the LDP forwarding entries and provides LDP view of its installed forwarding entries.

Task ID

Task ID

Operations

mpls-ldp

read

Examples

This is a sample output from the show mpls ldp forwarding command:


Note

The (!) symbol referes to a non-primary LFA backup path.

This sample output shows detailed information for the LDP timestamp that is used for routing and forwarding update from the detail keyword: 


RP/0/RP0/CPU0:router# show mpls ldp forwarding 1.1.1.1/32 detail
  
  Prefix           Label   Label      Outgoing     Next Hop        GR Stale
                   In      Out        Interface                            
  ---------------- ------- ---------- ------------ --------------- -- -----
  3.3.3.3/32       16000   16001     PO0/2/0/3.1   131.1.1.4         N  N
                           [ Protected; path-id 1 backup-path-id 33; 
                           [peer 13.13.13.1:0 ]
                           16002      PO0/2/0/3.2  131.1.2.4         Y  N 
                           [ Protected; path-id 2 backup-path-id 33; 
                           peer 13.13.13.1:0 ]
                           16003      PO0/2/0/3.3  131.1.3.4         N  N
                           [ Protected; path-id 3 backup-path-id 34;
                           peer 13.13.13.2:0 ]  
                           16002      PO0/2/0/1    192.11.1.1 (!)    Y  N
                           [ Backup; path-id 33; peer 14.14.14.1:0 ] 
                           Unlabelled PO0/2/0/2    192.11.2.1 (!)    N  N
                           [ Backup; path-id 34 ]  
    
  
    Routing update   : Mar 31 13:35:25.348 (00:55:32 ago)
    Forwarding update: Mar 31 13:35:25.349 (00:55:32 ago)

Note

The (!) symbol referes to a non-primary LFA backup path.

This sample output shows only LDP prefixes with protection (ECMP or secondary LFA backups) update from the fast-reroute keyword:

This sample output shows the statistics of protected prefixes and protected paths from the summary keyword: 


RP/0/RP0/CPU0:router# show mpls ldp forwarding summary
Forwarding Server (LSD):
  Connected: Yes
  Forwarding State Holdtime: 360 sec
Forwarding States:
  Interfaces: 10
  Local labels: 8
  Rewrites:
    Prefix:
      Total: 8 (0 with ECMP, 8 FRR protected)
      Labelled:
        Primary pathset : 8 labelled (0 partial), 0 unlabelled
        Backup pathset  : 8 labelled (0 partial), 0 unlabelled
        Complete pathset: 8 labelled (0 partial), 0 unlabelled
    Paths:
      Total: 16 (8 backup, 8 FRR protected)
      Labelled: 16 (8 backup)

This table describes the significant fields shown in the display.

Table 7. show mpls ldp forwarding Command Field Descriptions

Field

Description

Prefix/mask

Prefix on the FEC2 for an MPLS forwarding entry.

Label In

Local label assigned to the prefix/mask.

Label Out

Outgoing label for the prefix/mask.

Outgoing Interface

Outgoing physical interface.

Next Hop

Next Hop address.

GR

Graceful restart status (Y or N).

Stale

Status of the entry, stale or not stale. An entry is marked stale when the next-hop graceful restart neighbor disconnects and is unmarked when neighbor reconnects and refreshes the label.

Chkpt

Status of the entry, checkpointed or not checkpointed.

path-id

Primary Path-id.

Backup-path-id

The backup path-id is the path-id of the path protecting a given primary path. A protecting path can be primary path or a non-primary path.

Peer

Displays next-hop LDP peer's LDP identifier.

Connected

Displays LDP connection state with LSD forwarding server.

Forwarding State Holdtime

Displays time that LDP has registered with LSD server to keep LDP forwarding state intact upon LDP disconnect event.

Interfaces

Number of LDP enabled MPLS interfaces.

Local Labels

Number of LDP allocated local labels from LSD.

Rewrites

Counts of Forwarding rewrites. Displays total number of known IPv4 prefixes alongwith information on number of prefixes with more than one ECMP path. This also displays number of prefixes with LFA-FRR protection. The labelled set prints the counts related to prefixes with none, all, partial labelled paths as shown by unlabeled, labelled, and partial keywords. This information is available for primary, backup, and complete path set.

Paths

Forwarding path counts. Displays count of total number of known forwarding paths, along with number of backup paths and number of FRR protected paths. It also displays the count of labelled paths indicating how many of non-primary paths are labelled.

2 Forwarding Equivalence Class.

show mpls ldp graceful-restart

To display the status of the Label Distribution Protocol (LDP) graceful restart, use the show mpls ldp graceful-restart command in XR EXEC mode.

show mpls ldp [vrf all] [vrf vrf-name] graceful-restart [location node-id ] [standby] [ detail ]

Syntax Description

vrf all

(Optional) Displays all LDP configured VRFs.

vrf vrf-name

(Optional) Displays the VRF information for the specified VRF.

location node-id

(Optional) Displays location information for the specified node ID.

standby

(Optional) Displays standby-node-specific information.

detail

(Optional) Displays detailed information about the specified VRF.

Command Default

No default behavior or values

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

The show mpls ldp graceful-restart command displays LDP graceful-restart-related information when the graceful-restart command is enabled.

Task ID

Task ID

Operations

mpls-ldp

read

Examples

The following shows a sample output from the show mpls ldp graceful-restart command: 


RP/0/RP0/CPU0:router# show mpls ldp graceful-restart
  
    Forwarding State Hold timer : Not Running
    GR Neighbors                : 1
  
     Neighbor ID      Up  Connect Count  Liveness Timer      Recovery Timer    
     ---------------  --  -------------  ------------------  ------------------
     10.0.0.2                Y        1                -                   -

This table describes the significant fields shown in the display.

Table 8. show mpls ldp graceful-restart Command Field Descriptions

Field

Description

Forwarding State Hold timer

State of the hold timer—running or not running.

GR Neighbors

Number of graceful restartable neighbors.

Neighbor ID

Router ID of each neighbor.

Up

Neighbor up or down.

Connect Count

Number of times the same neighbor has reconnected.

Liveness Timer

State of the liveness timer (running or not running) and its expiration time, if running.

Recovery Timer

State of the recovery timer (running or not running) and its expiration time, if running.

show mpls ldp igp sync

To display Label Distribution Protocol (LDP) Interior Gateway Protocol (IGP) synchronization information on interface(s), use the show mpls ldp igp sync command in XR EXEC mode mode.

show mpls ldp [afi-all] [vrf all] [vrf vrf-name] [ipv4 | ipv6] igp sync [interface type interface-path-id] [brief] [location node-id ] [standby]

Syntax Description

afi-all

(Optional) Displays all address families.

vrf all

(Optional) Displays all LDP configured VRFs.

vrf vrf-name

(Optional) Displays the VRF information for the specified VRF.

ipv4

(Optional) Specifies IP version 4 address family.

ipv6

(Optional) Specifies IP version 6 address family.

brief

(Optional) Displays brief information about a specified LDP-enabled interface.

interface

(Optional) Displays the interface type.

type

(Optional) Interface type. For more information, use the question mark (?) online help function.

interface-path-id

(Optional) Physical interface or a virtual interface.

Note 

Use the show interfaces command to see a list of all possible interfaces currently configured on the router.

For more information about the syntax for the router, use the question mark (?) online help function.

location node-id

(Optional) Displays location information for the specified node ID.

standby

(Optional) Displays standby node-specific information.

Command Default

No default behavior or values

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

LDP IGP synchronization addresses traffic loss issues as a result of synchronization between MPLS LDP and IP (IGP). For instance, upon a link up, IGP can advertise a link before MPLS converges on the link. Also, the IGP link is still used even when MPLS session goes down and MPLS LSP is broken on this link. The use of IGP link is determined based on MPLS LDP convergence synchronization status on the link.

Use the show mpls ldp igp sync command to display MPLS convergence status. The configuration for LDP IGP synchronization resides in IGPs (OSPF, ISIS); accordingly, LDP displays and advertises this information for all LDP-enabled interfaces (regardless if the interface is configured for LDP IGP).

Task ID

Task ID

Operations

mpls-ldp

read

Examples

The following shows a sample output from the show mpls ldp igp sync command: 


RP/0/RP0/CPU0:router# show mpls ldp igp sync
    
  POS0/3/0/2:
    VRF: 'default' (0x60000000)
    Sync delay: Disabled
    Sync status: Ready
      Peers:
      192.168.0.1:0   (GR)

This table describes the significant fields shown in the display.

Table 9. show mpls ldp igp sync Command Field Descriptions

Field

Description

VRF

VRF of the interface.

Sync status

MPLS LDP convergence status on a given link. Ready indicates that the link is converged and is ready to be used by IGP. Not Ready with Deferred means that the link fulfills LDP IGP synchronization requirements but is deferred by LDP IGP synchronization delay timeout configuration setting. Not Ready means that the link is not ready to be used by IGP.

Peers

List of peers converged on the given link. If the peer session is GR3-enabled, output is tagged as GR. If GR-only reachability is indicated due to a GR neighbor record recovered from checkpoint after local start, then Chkpt-created flag is also set.

3 Graceful Restart.

show mpls ldp interface

To display information about LDP-enabled interfaces, use the show mpls ldp interfaces command in XR EXEC mode mode.

show mpls ldp [afi-all] [ipv4 | ipv6] interface [type interface-path-id | summary] [brief] [location node-id | standby]

Syntax Description

afi-all

(Optional) Displays all address families.

ipv4

(Optional) Specifies IP version 4 address family.

ipv6

(Optional) Specifies IP version 6 address family.

type

(Optional) Interface type. For more information, use the question mark (?) online help function.

interface-path-id

Physical interface or a virtual interface.

Note 

Use the show interfaces command to see a list of all possible interfaces currently configured on the router.

For more information about the syntax for the router, use the question mark (?) online help function.

summary

(Optional) Displays summary information about a specified LDP-enabled interface.

brief

(Optional) Displays concise information about a specified LDP-enabled interface.

detail

(Optional) Displays detailed information about a specified LDP-enabled interface.

location node-id

(Optional) Displays location information for the specified node ID.

standby

(Optional) Displays standby-node-specific information.

Command Default

No default behavior or values

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID

Operations

mpls-ldp

read

Examples

The following shows a sample output from the show mpls ldp interface command: 


RP/0/RP0/CPU0:router# show mpls ldp interface
  
  Interface GigabitEthernet0/3/0/3
      No LDP config
  Interface POS0/2/0/0
      No LDP config
      Auto-config items:
         ospf/100/0
  Interface POS0/2/0/1
      No LDP config
      Auto-config items:
         ospf/100/0
  Interface POS0/2/0/2
      No LDP config
      Auto-config items:
         ospf/100/0
  Interface POS0/2/0/3
      No LDP config
      Auto-config items:
         ospf/100/0

This table describes the significant fields shown in the display.

Table 10. show mpls ldp interface Command Field Descriptions

Field

Description

Auto-config items

Lists IGPs that specify an interface for MPLS LDP auto-configuration:
OSPF

ospf instance area

ISIS

isis instance

The following shows a sample output from the show mpls ldp interface detail command for the mesh groups: 


RP/0/RP0/CPU0:router# show mpls ldp interface detail
  
Interface GigabitEthernet0/2/0/0 (0x20200040)
	Enabled via config: LDP interface
Interface GigabitEthernet0/2/0/1 (0x20200060)
	Disabled via config: IGP Auto-config disable
	  Ignoring: LDP interface
Interface GigabitEthernet0/2/0/2 (0x20200080)
	Disabled via config: IGP Auto-config disable
	  Ignoring: LDP interface
Interface tunnel-te1 (0x200000f0)
	Disabled
Interface tunnel-te100 (0x20000110)
	Enabled via config: TE Mesh-group 123, TE Mesh-group all
Interface tunnel-te101 (0x20000130)
	Enabled via config: TE Mesh-group 123, TE Mesh-group all

show mpls ldp neighbor

To display the status of Label Distribution Protocol (LDP) sessions, use the show mpls ldp neighbor command in XR EXEC mode mode.

show mpls ldp [vrf all] [vrf vrf-name] neighbor [ip-address | ldp-id] [type interface-path-id] [brief] [capabilities] [detail] [gr] [location node-id] [non-gr] [sp] [standby]

Syntax Description

vrf all

(Optional) Displays all LDP configured VRFs.

vrf vrf-name

(Optional) Displays the VRF information for the specified VRF.

ip-address

(Optional) Neighbor IP address.

ldp-id

(Optional) Neighbor LDP ID in A.B.C.D: format.

type

(Optional) Interface type. For more information, use the question mark (?) online help function.

interface-path-id

Physical interface or a virtual interface.

Note 

Use the show interfaces command to see a list of all possible interfaces currently configured on the router.

For more information about the syntax for the router, use the question mark (?) online help function.

brief

(Optional) Displays the existing LDP sessions in brief format.

capabilities

(Optional) Displays the neighbor capabilities information.

detail

(Optional) Displays detailed information (including, inbound label filtering, session KAs, and session protection state) for an LDP session.

gr

(Optional) Displays graceful restartable neighbors.

location node-id

(Optional) Displays location information for the specified node ID.

non-gr

(Optional) Displays non-graceful restartable neighbors.

sp

(Optional) Displays neighbors with session protection.

standby

(Optional) Displays standby-node-specific information.

Command Default

No default behavior or values

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

The show mpls ldp neighbor command provides information about all LDP neighbors in the entire routing domain—conversely, the show output is filtered to display:

  • LDP neighbors with specific IP addresses
  • LDP neighbors on a specific interface
  • LDP neighbors that are graceful restartable
  • LDP neighbors that are nongraceful restartable
  • LDP neighbors enabled with session protection

Task ID

Task ID

Operations

mpls-ldp

read

Examples

The following shows a sample output from the show mpls ldp neighbor command using an IP address: 


RP/0/RP0/CPU0:router# show mpls ldp neighbor 4.4.4.4
  
Peer LDP Identifier: 4.4.4.4:0
  TCP connection: 14.1.0.41:38022 - 1.1.1.1:646
  Graceful Restart: Yes (Reconnect Timeout: 120 sec, Recovery: 96 sec)
  Session Holdtime: 180 sec
  State: Oper; Msgs sent/rcvd: 1721/1716; Downstream-Unsolicited
  Up time: 1d00h
  LDP Discovery Sources:
    IPv4: (1)
      GigabitEthernet0/1/0/0
    IPv6: (0)
  Addresses bound to this peer:
    IPv4: (3)
      4.4.4.4        14.1.0.41      24.1.0.4       
    IPv6: (0)

The following shows a sample output from the show mpls ldp neighbor command using the non-gr keyword: 


RP/0/RP0/CPU0:router# show mpls ldp neighbor non-gr
  
  Peer LDP Identifier: 10.44.44.44:0
    TCP connection: 10.44.44.44:65535 - 10.33.33.33:646
    Graceful Restart: No
    State: Oper; Msgs sent/rcvd: 49/46
    Up time: 00:33:33
    LDP Discovery Sources: 
      POS 0/1/0/0
    Addresses bound to this peer:
      10.44.44.44     10.10.3.2      
  Peer LDP Identifier: 10.22.22.22:0
    TCP connection: 10.22.22.22:646 - 10.33.33.33:65530
    Graceful Restart: No
    State: Oper; Msgs sent/rcvd: 48/45
    Up time: 00:33:11
    LDP Discovery Sources: 
      POS 0/2/0/0
    Addresses bound to this peer:
      10.22.22.22     10.10.2.1

This table describes the significant fields shown in the display.

Table 11. show mpls ldp neighbor Command Field Descriptions

Field

Description

Peer LDP Identifier

LDP identifier of the neighbor (peer) for this session.

TCP connection

TCP connection used to support the LDP session, shown in the following format:
neighbor IP address

peer port

local IP address

local port

Graceful Restart

Graceful-restart status (Y or N).

State

State of the LDP session. Generally this is Oper (operational), but transient is another possible state.

Msgs sent/rcvd

Number of LDP messages sent to and received from the session peer. The count includes the transmission and receipt of periodic keepalive messages, which are required for maintenance of the LDP session.

Up time

The length of time that this session has been up for (in hh:mm:ss format).

LDP Discovery Sources

The source(s) of LDP discovery activity leading to the establishment of the LDP session.

Addresses bound to this peer

The known interface addresses of the LDP session peer. These are addresses that might appear as “next hop” addresses in the local routing table. They are used to maintain the LFIB4.

4 LFIB = Label Forwarding Information Base.

The following shows a sample output from the show mpls ldp neighbor command using the brief keyword: 


RP/0/RP0/CPU0:router# show mpls ldp neighbor brief
  
Peer               GR  NSR  Up Time     Discovery   Addresses     Labels    
                                        ipv4  ipv6  ipv4  ipv6  ipv4   ipv6 
-----------------  --  ---  ----------  ----------  ----------  ------------
4.4.4.4:0          Y   N    1d00h       1     0     3     0     5      0    
46.46.46.2:0       N   N    1d00h       1     1     3     3     5      5    
46.46.46.46:0      Y   N    1d00h       2     2     4     4     5      5    
6.6.6.1:0          Y   N    23:25:50    0     1     0     2     0      5

This table describes the significant fields shown in the display.

Table 12. show mpls ldp neighbor brief Command Field Descriptions

Field

Description

Peer

LDP identifier of the neighbor (peer) for this session.

GR

Graceful-restart status (Y or N).

Up Time

Time the session has been up (in hh:mm:ss format).

Discovery

Number of LDP discovery sources corresponding to the neighbor.

Address

Number of addresses bound to this peer.

The following shows a sample output from the show mpls ldp neighbor command using the detail keyword: 


RP/0/RP0/CPU0:router# show mpls ldp neighbor detail
 
  Peer LDP Identifier: 2.2.2.2:0
    TCP connection: 2.2.2.2:11707 - 1.1.1.1:646
    Graceful Restart: No
    Session Holdtime: 180 sec
    State: Oper; Msgs sent/rcvd: 33/29
    Up time: 00:13:37
    LDP Discovery Sources: 
       POS0/2/0/1
      Targeted Hello (1.1.1.1 ->2.2.2.2, active)
    Addresses bound to this peer:
      23.0.0.2 2.0.0.2        123.0.4.2       10.42.37.119    
      10.2.2.2        
    Peer holdtime: 180 sec; KA interval: 60 sec; Peer state: Estab
    Clients: Dir Adj Client
    Inbound label filtering: accept acl 'pfx_acl2'
    Session Protection:
      Enabled, state: Ready
      Duration: 30 seconds

This table describes the significant fields shown in the display.

Table 13. show mpls ldp neighbor detail Command Field Descriptions

Field

Description

Peer LDP Identifier

LDP identifier of the neighbor (peer) for this session.

TCP connection

TCP connection used to support the LDP session, shown in the following format:
neighbor IP address

peer port

local IP address

local port

Graceful Restart

Graceful-restart status (Y or N).

Session Holdtime

Session hold time, in seconds.

State

State of the LDP session (operational or transient).

Msgs sent/rcvd

Number of LDP messages sent to and received from the session peer. The count includes the transmission and receipt of periodic keepalive messages, which are required for maintenance of the LDP session.

Up time

Time the session has been up for (in hh:mm:ss format).

Peer holdtime

Time to keep LDP peer session up without receipt of LDP protocol message from a peer.

Peer state

Peer session state.

Peer holdtime

Time to keep LDP peer session up without receipt of LDP protocol message from a peer.

Clients

LDP (internal) clients requesting session with a neighbor.

Inbound label filtering

LDP neighbor inbound filtering policy.

Session Protection

State of the session protection:
Incomplete

Targeted discovery requested but not yet up.

Ready

Targeted discovery and at least one link hello adjacency to the peer are up.

Protecting

Targeted discovery is up and there is no link hello adjacency to the peer. Targeted discovery is protecting and backing up link discoveries.

Duration

Maximum time to maintain session through targeted discovery upon loss of primary link discovery.

Holdtimer

When in “protecting” state, time to keep LDP peer session up without receipt of LDP protocol message from a peer.

show mpls ldp nsr pending neighbor

To display the nonstop routing (NSR) pending neighbor information for an LDP session, use the show mpls ldp nsr pending neighbor command in the XR EXEC mode.

show mpls ldp [vrf vrf-name] nsr pending neighbor [lsr-id | ldp-id] [location node-id | standby]

Syntax Description

vrf vrf-name

(Optional) Displays the VRF information for the specified VRF.

lsr-id

(Optional) LSR ID of neighbor in A.B.C.D format.

ldp-id

(Optional) LDP ID of neighbor in A.B.C.D: format.

location node-id

(Optional) Displays location information for the specified node ID.

standby

(Optional) Displays standby-node-specific information.

Command Default

No default behavior or values

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID Operation

mpls-ldp

read

Examples

The following example shows how to display NSR pending neighbor information for an LDP session: 



RP/0/RP0/CPU0:router# show mpls ldp nsr pending neighbor

show mpls ldp nsr statistics

To display the nonstop routing (NSR) statistics for an LDP session, use the show mpls ldp nsr statistics command in XR EXEC mode.

show mpls ldp [vrf vrf-name] nsr statistics [location node-id | standby] [neighbor [lsr-id | ldp-id] [location node-id | standby]]

Syntax Description

vrf vrf-name

(Optional) Displays the VRF information for the specified VRF.

location node-id

(Optional) Displays location information for the specified node ID.

standby

(Optional) Displays standby-node-specific information.

neighbor

(Optional) Displays neighbor information.

lsr-id

(Optional) LSR ID of neighbor in A.B.C.D format.

ldp-id

(Optional) LDP ID of neighbor in A.B.C.D: format.

Command Default

No default behavior or values

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID Operation

mpls-ldp

read

Examples

The following shows a sample output from the show mpls ldp nsr statistics command: 



RP/0/RP0/CPU0:router# show mpls ldp nsr statistics

Global Init Sync:
  Start: Oct 27 12:12:23 (00:01:20 ago)
  End:   Oct 27 12:12:23 (00:01:20 ago)

Protocol message stats:
  4 Peer, 5 Adj, 0 DHCB, 14/20 sent/rcvd Capabilities
  23 peer label for 18 FEC
  Send-Ack: 0 Lcl-Addr-WD

Sync message stats:
  Tx msgs/bytes = 32/5024
  Rx msgs/bytes = 0/0
  Max IPC Tx/Rx bytes = 4396/0
  Default MTU bytes = 4768, IPCs exceeding MTU = 0
  TX current/total fail count = 0/0
  IPC restart count = 1

show mpls ldp nsr summary

To display the nonstop routing (NSR) summary for an LDP session, use the show mpls ldp nsr summary command in XR EXEC mode.

show mpls ldp [vrf all] [vrf vrf-name] nsr summary [location node-id | standby] [all]

Syntax Description

vrf all

(Optional) Displays all LDP configured VRFs.

vrf vrf-name

(Optional) Displays the VRF information for the specified VRF.

location node-id

(Optional) Displays location information for the specified node ID.

standby

(Optional) Displays standby-node-specific information.

all

(Optional) Displays the aggregate summary across LDP processes and all VRFs.

Command Default

No default behavior or values

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID Operation

mpls-ldp

read

Examples

The following shows a sample output from the show mpls ldp nsr summary command: 



RP/0/RP0/CPU0:router# show mpls ldp nsr summary

Sessions:
   Total: 1, NSR-eligible: 1, Sync-ed: 1
      (1 Oper)

show mpls ldp parameters

To display current LDP parameters, use the show mpls ldp parameters command in XR EXEC mode mode.

show mpls ldp [vrf vrf-name] parameters [location node-id | standby]

Syntax Description

vrf vrf-name

(Optional) Displays the VRF information for the specified VRF.

location node-id

(Optional) Displays location information for the specified node ID.

standby

(Optional) Displays standby-node-specific information.

Command Default

No default behavior or values

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

The show mpls ldp parameters command displays all LDP operational and configuration parameters.

Task ID

Task ID

Operations

mpls-ldp

read

network

read

Examples

The following shows a sample output from the show mpls ldp parameters command: 


RP/0/RP0/CPU0:router# show mpls ldp parameters
  
  LDP Parameters:
    Protocol Version: 1
    Router ID: 10.11.11.11
    Null Label: Implicit
    Session:
      Hold time: 180 sec
      Keepalive interval: 60 sec
      Backoff: Initial:15 sec, Maximum:120 sec
    Discovery:
      Link Hellos:     Holdtime:15 sec, Interval:5 sec
      Targeted Hellos: Holdtime:90 sec, Interval:10 sec
                       (Accepting peer ACL 'peer_acl_10')
    Graceful Restart:
      Enabled (Configured)
      Reconnect Timeout:120 sec, Forwarding State Holdtime:180 sec
    Timeouts:
      Binding with no-route: 300 sec
      LDP application recovery (with LSD): 360 sec
    OOR state
      Memory: Normal

This table describes the significant fields shown in the display.

Table 14. show mpls ldp parameters Command Field Descriptions

Field

Description

Protocol Version

Version of LDP running on the platform.

Router ID

Currently used router ID.

Null Label

LDP use of implicit-null or explicit-null as label for prefixes where it has to use a null label.

Session Hold time

Time LDP session is to be maintained with an LDP peer without receiving LDP traffic or an LDP keepalive message from the peer.

Session Keepalive interval

Time interval between consecutive transmissions of LDP keepalive messages to an LDP peer.

Session Backoff

Initial maximum backoff time for sessions.

Discovery Link Hellos

Time to remember that a neighbor platform wants an LDP session without receiving an LDP hello message from the neighbor (hold time), and the time interval between the transmission of consecutive LDP hello messages to neighbors (interval).

Discovery Targeted Hellos

Indicates the time:

  • To remember that a neighbor platform wants an LDP session when the neighbor platform is not directly connected to the router or the neighbor platform has not sent an LDP hello message. This intervening interval is known as hold time.
  • Interval between the transmission of consecutive hello messages to a neighbor not directly connected to the router and if targeted hellos are being accepted, displaying peer-acl (if any).

Graceful Restart

Status of graceful-restart status (Y or N).

Timeouts

Various timeouts (of interest) that the LDP is using. One timeout is binding no route, which indicates how long the LDP waits for an invalid route before deleting it. It also shows restart recovery time for LSD and LDP.

OOR state

Out of resource memory state: Normal, Major, or Critical.

show mpls ldp statistics fwd-setup

To display the statistics of the forwarding setup counters related to RIB/LSD, use the show mpls ldp statistics fwd-setup command in XR EXEC mode.

show mpls ldp [vrf vrf-name] statistics fwd-setup [location node-id | standby]

Syntax Description

vrf vrf-name

(Optional) Displays the VRF information for the specified VRF.

location node-id

(Optional) Displays location information for the specified node ID.

standby

(Optional) Displays standby-node-specific information.

Command Default

No default behavior or values

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID Operation

mpls-ldp

read

Examples

The following shows a sample output from the show mpls ldp statistics fwd-setup command: 



RP/0/RP0/CPU0:router# show mpls ldp statistics fwd-setup

RIB
===

Thread counters: 
  Events In           : 10
  Events Out          : 39
  RIB fetch throttled : 0 (0 during last throttle)

TC Thread counters: 
  Events In           : 39 (3 skipped)
  Events Out          : 12 (0 failed, 2 skipped)

Address Family: IPv4
  RIB server connects: 1
  RIB converged: Yes
  Op counters: 
    Fetch          : 4 (2 buffers per fetch)
                     no-data: 0
                     callbacks: 33 routes, 3 convg, 0 rcmd
    Route Up       : 33 (0 protected; Paths: 29/0/0 total/backup/protected)
    Route Down     : 0
    Route Filtered : 5 (0 intern, 5 misc, 0 alloc, 0 admin,
                        0 unsupp-intf 0, unsupp-protection,
                        0 bgp, 0 bgp-unlabelled, 0 ibgp-no-lbl-ucast)

MFI
===

Thread counters: 
  Events In           : 9
  Events Out          : 8
  LSD Rsrc-Complete   : 1
  LSD server connects : 1

Op counters: 
                             Successful      Failed
                             ----------      ------
    Control              :            3           0
    RCMD Markers         :            0           0
    State cleanup        :            0           0
    Interface Enable     :            5           0
    Interface Disable    :            0           0
    Label alloc          :            4           0
    Label alloc - mldp   :            0           0
    Label free           :            0           0
    Label free - mldp    :            0           0
    Rewrite create       :            6           0
    Rewrite delete       :            0           0
    Label/Rewrite create :            0           0
    Label/Rewrite delete :            0           0
    Label OOR cleared    :            3           0

    Total LSD Reqs/Msgs  :            7           0

LSD flow control status: 
  Flow control            : 0
  Flow control cnt        : 0
  Evt queue item cnt      : 0
  Last flow control       : N/A

show mpls ldp statistics msg-counters

To display statistics of the messages exchanged between neighbors, use the show mpls ldp statistics msg-counters command in XR EXEC mode mode.

show mpls ldp [vrf vrf-name] statistics msg-counters [lsr-id | ldp-id] [location node-id | standby]

Syntax Description

vrf vrf-name

(Optional) Displays the VRF information for the specified VRF.

lsr-id

(Optional) LSR ID of neighbor in A.B.C.D format.

ldp-id

(Optional) LDP ID of neighbor in A.B.C.D: format.

location node-id

(Optional) Displays location information for the specified node ID.

standby

(Optional) Displays standby-node-specific information.

Command Default

No default behavior or values

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

The show mpls ldp statistics msg-counters command can provide counter information about different types of messages sent and received between neighbors.

Task ID

Task ID

Operations

mpls-ldp

read

Examples

The following shows a sample output from the show mpls ldp statistics msg-counters command: 


RP/0/RP0/CPU0:router# show mpls ldp statistics msg-counters
  
  Peer LDP Identifier: 10.33.33.33:0
     Msg Sent: (80)
       Init             : 1
       Address          : 1
       Address_Withdraw : 0
       Label_Mapping    : 5
       Label_Withdraw   : 0
       Label_Release    : 0
       Notification     : 0
       KeepAlive        : 73
  
     Msg Rcvd: (81)
       Init             : 1
       Address          : 1
       Address_Withdraw : 0
       Label_Mapping    : 8
       Label_Withdraw   : 0
       Label_Release    : 0
       Notification     : 0
       KeepAlive        : 71

The below table describes the significant fields shown in the display.

Table 15. show mpls ldp statistics msg-counters Command Field Descriptions

Field

Description

Peer LDP Identifier

LDP identifier of the neighbor (peer).

Msg Sent

Summary of messages sent to the LDP peer.

Msg Rcvd

Summary of messages received from the LDP peer.

show mpls ldp summary

To display a summary of LDP information, use the show mpls ldp summary command in System Admin EXEC mode mode.

show mpls ldp [vrf all] [vrf vrf-name] summary [location node-id | standby] [all]

Syntax Description

vrf all

(Optional) Displays all LDP configured VRFs.

vrf vrf-name

(Optional) Displays the VRF information for the specified VRF.

location node-id

(Optional) Displays location information for the specified node ID.

standby

(Optional) Displays standby-node-specific information.

all

(Optional) Displays the aggregate summary across LDP processes and all VRFs.

Command Default

No default behavior or values

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

The show mpls ldp summary command can provide information about the number of LDP neighbors, interfaces, forwarding state (rewrites), servers connection/registration, and graceful-restart information.

Task ID

Task ID

Operations

mpls-ldp

read

Examples

The following example shows a sample output from the show mpls ldp summary command: 


RP/0/RP0/CPU0:router# show mpls ldp summary
   
			AFIs 					: IPv4
   Routes 			: 4
   Neighbors	: 1 (1 GR)
   Hello Adj	: 1
			Addresses : 3
			Interfaces: 4 LDP configured

The following example shows a sample output from the show mpls ldp summary all command: 


RP/0/RP0/CPU0:router# show mpls ldp summary all
  
			VRFs         : 1 (1 oper)
			AFIs         : IPv4
			Routes    			: 4
   Neighbors 			: 1 (1 GR)
   Hello Adj 			: 1
			Addresses 			: 3
   Interfaces			: 4 (1 forward reference, 2 LDP configured)
   Collaborators:
   
                   	Connected  	Registered
                   	---------  	----------
       SysDB           	Y          Y
       IM              	Y          Y
							RSI														Y										-
							IP-ARM											Y          -
       IPv4-RIB        	Y          Y (1/1 tables)
       LSD             	Y          Y
							LDP-NSR-Partner  Y          -
							L2VPN-AToM       Y          -
    			mLDP             -          N

This table describes the significant fields shown in the display.

Table 16. show mpls ldp summary Command Field Descriptions

Field

Description

Routes

Number of known IP routes (prefixes).

Neighbors

Number of LDP neighbors, including targeted and graceful restartable neighbors.

Hello Adj

Number of discovered LDP discovery sources.

Interfaces

Number of known IP interfaces and number of LDP configured interfaces.

LDP is configured on a forward-referenced interface which may not exist or for which no IP address is configured.

Addresses

Number of known local IP addresses.

show mpls ldp trace

To display the Label Distribution Protocol (LDP) VRF event traces, use the show mpls ldp trace vrf command in XR EXEC mode.

show mpls ldp trace vrf [binding] [capabilities] [config] [dev] [discovery] [error] [file file-name] [forwarding] [gr] [hexdump] [iccp] [igp-sync] [interface] [last] [location {node-id | name | all | mgmt-nodes}] [misc] [mldp] [nsr] [peer] [process] [pw] [reverse] [route] [since] [stats] [tailf] [unique] [usec] [verbose] [wide] [wrapping]

Syntax Description

binding

(Optional) Displays the binding event traces.

capabilities

(Optional) Displays the capabilities event traces.

config

(Optional) Displays the configuration event traces.

dev

(Optional) Displays the development private traces.

discovery

(Optional) Displays Hello or discovery and adj event traces.

error

(Optional) Displays error traces.

file file-name

(Optional) Displays trace of a specific file.

forwarding

(Optional) Displays forwarding event traces.

gr

(Optional) Displays graceful-restart event traces.

hexdump

(Optional) Displays traces in hexadecimal.

iccp

(Optional) Displays ICCP signaling event traces.

igp-sync

(Optional) Displays IGP sync event traces.

interface

(Optional) Displays interface event traces.

last

(Optional) Displays last number of entries.

location

(Optional) Identifies the location of the card whose CPU controller trace information you want to display.

node-id

The node-id argument is expressed in the rack/slot/module notation.

name

Specifies the name of the card.

all

Specifies all locations.

mgmt-nodes

Specifies all managements nodes.

misc

(Optional) Displays miscellaneous event traces.

mldp

(Optional) Displays MLDP event traces.

nsr

(Optional) Displays non-stop routing event traces.

peer

(Optional) Displays peer session event traces.

process

(Optional) Displays process-level event traces.

pw

(Optional) Displays L2VPN pseudo-wire event traces.

reverse

(Optional) Displays latest traces first.

route

(Optional) Displays route event traces.

since last-start

(Optional) Displays traces since the last start time.

stats

(Optional) Displays statistics.

tailf

(Optional) Displays new traces as they are added.

unique

(Optional) Displays unique entries with count.

usec

(Optional) Displays timestamp w/usec detail.

verbose

(Optional) Displays internal debugging information.

wide

(Optional) Do not display buffer name, node name and tid.

wrapping

(Optional) Displays wrapping entries.

Command Default

No default behavior or values

Command Modes

XR EXEC mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID Operation

mpls-ldp

read

Examples

The following example shows how to display the LDP VRF event traces: 



RP/0/RP0/CPU0:router# show mpls ldp trace vrf


4 wrapping entries (992576 possible, 38720 allocated, 4377 filtered, 4381 total)
Nov 23 05:54:44.332 mpls/ldp/vrf 0/RP0/CPU0 t7181 [VRF]:718: Tbl(0xe0000000): ldp_vrf_tbl_go_active: afi IPv4
Nov 23 05:54:44.335 mpls/ldp/vrf 0/RP0/CPU0 t7181 [VRF]:604: VRF(0x60000000): ldp_vrf_ctx_enable done
Nov 23 05:54:44.360 mpls/ldp/vrf 0/RP0/CPU0 t7181 [VRF]:703: VRF(0x60000000): ldp_vrf_ctx_af_enable done: afi IPv4
Nov 23 05:54:44.360 mpls/ldp/vrf 0/RP0/CPU0 t7181 [VRF]:718: Tbl(0xe0800000): ldp_vrf_tbl_go_active: afi IPv6

show lcc

To display label consistency checker (LCC) information, use the show lcc command in XR EXEC mode mode.

show lcc {ipv4 | ipv6} unicast {all | label | tunnel-interface | statistics | [summary | scan-id scan-id]} [vrf vrfname]

Syntax Description

ipv4

Specifies IP version 4 address prefixes.

ipv6

Specifies IP version 6 address prefixes.

unicast

Specifies unicast address prefixes.

all

Scans all routes.

label

Scans all labels.

tunnel-interface

Specifies the interface of a tunnel.

statistics

Displays route consistency check statistics information.

scan-id

Specifies the value of scan-id. Range is from 0 to 100000.

summary

Displays background route consistency check statistics summary information.

vrf vrfname

(Optional) Specifies a particular VPN routing and forwarding (VRF) instance or all VRF instances.

Command Default

None

Command Modes

IPv4 address family configuration

IPv6 address family configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID

Operations

IPv4

read

IPv6

read

Examples

The following example shows an outcome of the label consistency checker information: 
RP/0/RP0/CPU0:router# show lcc ipv4 unicast all

Sending scan initiation request to IPv4 LSD ... done
Waiting for scan to complete (max time 600 seconds)......................
Scan Completed
Collecting scan results from FIBs (max time 30 seconds)... done
Number of nodes involved in the scan: 2
Number of nodes replying to the scan: 2

Legend: 
        ? - Currently Inactive Node, ! - Non-standard SVD Role
        * - Node did not reply

   Node                 Checks Performed                Errors

   0/2/CPU0                    6                             0
   0/0/CPU0                    6                             0

signalling dscp (LDP)

To assign label distribution protocol (LDP) signaling packets a differentiated service code point (DSCP) to assign higher priority to the control packets while traversing the network, use the signalling dscp command in MPLS LDP configuration mode. To return to the default behavior, use the no form of this command.

signalling dscp dscp

no signalling dscp

Syntax Description

dscp

DSCP priority value. Range is 0 to 63.

Command Default

LDP control packets are sent with precedence 6 (dscp : 48)

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

DSCP marking improves signaling setup and teardown times.

Ordinarily, when LDP sends hello discovery or protocol control messages, these are marked using the default control packet precedence value (6, or dscp 48). You can use the signalling dscp command to override that DSCP value to ensure that all control messages sent are marked with a specified DSCP.


Note

While the signalling dscp command controls LDP signaling packets (Discovery hellos and protocol messages), it has no effect on ordinary IP or MPLS data packets.

Task ID

Task ID

Operations

mpls-ldp

read, write

Examples

The following example shows how to assign LDP packets a DSCP value of 56: 


RP/0/RP0/CPU0:router(config-ldp)# signalling dscp 56

snmp-server traps mpls ldp

To inform a network management system of session and threshold cross changes, use the snmp-server traps mpls ldp command in global configuration mode.

snmp-server traps mpls ldp {up | down | threshold}

Syntax Description

up

Displays the session-up notification.

down

Displays the session-down notification.

threshold

Displays the session-backoff-threshold crossed notification.

Command Default

LDP does not send SNMP traps.

Command Modes

XR Config mode

Command History

Release

Modification

Release 6.0

This command was introduced.

Usage Guidelines

The snmp-server traps mpls ldp command sends notifications to the SNMP server. There are three types of traps sent by LDP:

Session up

Generated when sessions go up.

Session down

Generated when sessions go down.

Threshold

Generated when attempts to establish a session fails. The predefined value is 8.

Task ID

Task ID

Operations

mpls-ldp

read, write

mpls-te

read, write

snmp

read, write

Examples

The following example shows how to enable LDP SNMP trap notifications for Session up: 


RP/0/RP0/CPU0:router(config)# snmp-server traps mpls ldp up

address-family ipv4/ipv6 label

To configure label control and policies on a specific IPv4 or IPv6 destination, use the address-family ipv4/ipv6 label command in the MPLS LDP configuration mode.

[ vrf vrf-name ] address-family {ipv4 | ipv6} label [remote accept from ldp-id for prefix-acl] local [default-route] [allocate for {prefix-acl | host-routes}] [ advertise [to ldp-id for prefix-acl] [interface type interface-path-id ] ]

Syntax Description

address-family

Configure address-family and its parameters.

ipv4

Specifies IP version 4 address family.

ipv6

Specifies IP version 6 address family.

label

(Optional) Configure label control and policies.

remote

(Optional) Configure remote/peer label control and policies.

accept

(Optional) Configure inbound label acceptance control.

from ldp-id

Specifies which LDP neighbors will receive label advertisements. LDP ID is written in A.B.C.D: format.

for prefix-acl

Specifies prefix destinations for which labels will be advertised.

local

(Optional) Configure local label control and policies.

default-route

(Optional) Enable MPLS forwarding for default route.

allocate

(Optional) Configure label allocation control.

for prefix-acl

Specifies prefix destinations for which labels will be allocated.

host-routes

Allocates labels for host routes only.

advertise

(Optional) Configure outbound label advertisement control.

to ldp-id

(Optional) Specifies which LDP neighbors will receive label advertisements. LDP ID is written in A.B.C.D: format.

for prefix-acl

(Optional) Specifies prefix destinations for which labels will be advertised.

interface

(Optional) Advertise interface host address.

type

Interface type. For more information, use the question mark (?) online help function.

interface-path-id

Physical interface or a virtual interface.

Note 

Use the show interfaces command to see a list of all possible interfaces currently configured on the router.

For more information about the syntax for the router, use the question mark (?) online help function.

Command Default

No default behavior or values

Command Modes

MPLS LDP configuration

Command History

Release

Modification

Release 6.0

This command was introduced

Usage Guidelines

No specific guidelines impact the use of this command.

Task ID

Task ID Operation

mpls-ldp

read, write

Examples

The following example shows how to configure label control and policies on a specific IPv4 destination: 



RP/0/RP0/CPU0:router(config-ldp)# address-family ipv4	label