IPv6 Commands: ro to show bgp la

router ospfv3

To enter Open Shortest Path First version 3 (OSPFv3) router configuration mode, use the router ospfv3 command in interface configuration mode.

router ospfv3 [process-id]

Syntax Description

process-id

(Optional) Internal identification. The number used here is the number assigned administratively when enabling the OSPFv3 routing process and can be a value from 1 through 65535.

Command Default

No OSPFv3 routing process is defined.

Command Modes


Global configuration (config)

Command History

Release

Modification

15.1(3)S

This command was introduced.

Cisco IOS XE Release 3.4S

This command was integrated into Cisco IOS XE Release 3.4S.

15.2(1)T

This command was integrated into Cisco IOS Release 15.2(1)T.

15.1(1)SY

This command was integrated into Cisco IOS Release 15.1(1)SY.

Usage Guidelines

Use the router ospfv3 command to enter the OSPFv3 router configuration mode. From this mode, you can enter address-family configuration mode for IPv6 or IPv4 and then configure the IPv6 or IPv4 AF.

Examples

The following example enters OSPFv3 router configuration mode: 


Router(config)# router ospfv3 1
Router(config-router)#

Related Commands

Command

Description

ipv6 ospf area

Enables OSPFv3 on an interface

ospfv3 area

Enables OSPFv3 on an interface with the IPv4 or IPv6 AF.

router-id (IPv6)

To use a fixed router ID, use the router-id command in router configuration mode. To force Open Shortest Path First (OSPF) for IPv6 to use the previous OSPF for IPv6 router ID behavior, use the no form of this command.

router-id router-id

no router-id router-id

Syntax Description

router-id

Router ID for this OSPF process.

Command Default

The router ID is chosen automatically.

Command Modes


Router configuration

Command History

Release

Modification

12.2(15)T

This command was introduced.

12.4(6)T

Support for Enhanced Internal Gateway Routing Protocol (EIGRP) IPv6 was added.

12.2(33)SRB

This command was integrated into Cisco IOS Release 12.2(33)SRB.

12.2(33)SXH

This command was integrated into Cisco IOS Release 12.2(33)SXH.

Cisco IOS XE Release 2.1

This command was introduced on Cisco ASR 1000 series routers.

Usage Guidelines

OSPF for IPv6 (or OSPF version 3, or OSPFv3) is backward-compatible with OSPF version 2. In OSPFv3 and OSPF version 2, the router uses the 32-bit IPv4 address to select the router ID for an OSPF process. If an IPv4 address exists when OSPFv3 is enabled on an interface, then that IPv4 address is used for the router ID. If more than one IPv4 address is available, a router ID is chosen using the same rules as for OSPF version 2. If no IPv4 addresses are configured, the router selects a router ID automatically. Each router ID must be unique.

If this command is used on an OSPF for IPv6 router process that is already active (has neighbors), the new router ID is used at the next reload or at a manual OSPFv3 process restart. To manually restart the OSPFv3 process, use the clear ipv6 ospf process command.

Examples

The following example specifies a fixed router ID: 


Router(config-rtr)# router-id 10.1.1.1

Related Commands

Command

Description

clear ipv6 ospf

Clears the OSPF for IPv6 state based on the OSPF routing process ID.

ipv6 router eigrp

Configures the EIGRP IPv6 routing process.

ipv6 router ospf

Enables OSPF for IPv6 router configuration mode.

router-id (OSPFv3)

To use a fixed router ID, use the router-id command in Open Shortest Path First version 3 (OSPFv3) router configuration mode. To force OSPFv3 to use the previous OSPFv3 router ID behavior in IPv4, use the no form of this command.

router-id router-id

no router-id router-id

Syntax Description

router-id

Router ID for this OSPFv3 process.

Command Default

The router ID is chosen automatically.

Command Modes


OSPFv3 router configuration mode (config-router)

Command History

Release

Modification

15.1(3)S

This command was introduced.

Cisco IOS XE Release 3.4S

This command was integrated into Cisco IOS XE Release 3.4S.

15.2(1)T

This command was integrated into Cisco IOS Release 15.2(1)T.

15.1(1)SY

This command was integrated into Cisco IOS Release 15.1(1)SY.

Usage Guidelines

OSPFv3 is backward-compatible with OSPF version 2. In OSPFv3 and OSPF version 2, the router uses the 32-bit IPv4 address to select the router ID for an OSPFv3 process. If an IPv4 address exists when OSPFv3 is enabled on an interface, then that IPv4 address is used for the router ID. If more than one IPv4 address is available, a router ID is chosen using the same rules as for OSPF version 2. If no IPv4 addresses are configured, the router selects a router ID automatically. Each router ID must be unique.

If this command is used on an OSPFv3 router process that is already active (has neighbors), the new router ID is used at the next reload or at a manual OSPFv3 process restart.

Examples

The following example specifies a fixed router ID: 


Router(config-router)# router-id 10.1.1.1

Related Commands

Command

Description

router ospfv3

Enables OSPFv3 router configuration mode for the IPv4 or IPv6 address family.

router-preference maximum

To verify the advertised default router preference parameter value, use the router-preference maximum command in RA guard policy configuration mode.

router-preference maximum {high | low | medium}

Syntax Description

high

Default router preference parameter value is higher than the specified limit.

medium

Default router preference parameter value is equal to the specified limit.

low

Default router preference parameter value is lower than the specified limit.

Command Default

The router preference maximum value is not configured.

Command Modes


RA guard policy configuration
(config-ra-guard)

Command History

Release

Modification

12.2(50)SY

This command was introduced.

15.2(4)S

This command was integrated into Cisco IOS Release 15.2(4)S.

15.0(2)SE

This command was integrated into Cisco IOS Release 15.0(2)SE.

Cisco IOS XE Release 3.2SE

This command was integrated into Cisco IOS XE Release 3.2SE.

Usage Guidelines

The router-preference maximum command enables verification that the advertised default router preference parameter value is lower than or equal to a specified limit. You can use this command to give a lower priority to default routers advertised on trunk ports, and to give precedence to default routers advertised on access ports.

The router-preference maximum command limit are high, medium, or low. If, for example, this value is set to medium and the advertised default router preference is set to high in the received packet, then the packet is dropped. If the command option is set to medium or low in the received packet, then the packet is not dropped.

Examples

The following example shows how the command defines a router advertisement (RA) guard policy name as raguard1, places the router in RA guard policy configuration mode, and configures router-preference maximum verification to be high: 


Router(config)# ipv6 nd raguard policy raguard1
Router(config-ra-guard)# router-preference maximum high

Related Commands

Command

Description

ipv6 nd raguard policy

Defines the RA guard policy name and enters RA guard policy configuration mode.

sec-level minimum

To specify the minimum security level parameter value when Cryptographically Generated Address (CGA) options are used, use the sec-level minimum command in Neighbor Discovery (ND) inspection policy configuration mode. To disable this function, use the no form of this command.

sec-level minimum value

no sec-level minimum value

Syntax Description

value

Minimum security level, which is a value from 1 to 7. The default security level is 1. The most secure level is 3.

Command Default

The default security level is 1.

Command Modes


ND inspection policy configuration (config-nd-inspection)

RA guard policy configuration (config-ra-guard)

Command History

Release

Modification

12.2(50)SY

This command was introduced.

15.0(2)SE

This command was integrated into Cisco IOS Release 15.0(2)SE.

15.3(1)S

This command was integrated into Cisco IOS Release 15.3(1)S.

Cisco IOS XE Release 3.2SE

This command was integrated into Cisco IOS XE Release 3.2SE.

Usage Guidelines

The sec-level minimum command specifies the minimum security level parameter value when CGA options are used. Use the sec-level minimum command after enabling ND inspection policy configuration mode using the ipv6 nd inspection policy command.

Examples

The following example defines an ND policy name as policy1, places the router in ND inspection policy configuration mode, and specifies 2 as the minimum CGA security level: 


Router(config)# ipv6 nd inspection policy policy1
Router(config-nd-inspection)# sec-level minimum 2

Related Commands

Command

Description

ipv6 nd inspection policy

Defines the ND inspection policy name and enters ND inspection policy configuration mode.

ipv6 nd raguard policy

Defines the RA guard policy name and enters RA guard policy configuration mode.

server name (IPv6 TACACS+)

To specify an IPv6 TACACS+ server, use the server name command in TACACS+ group server configuration mode. To remove the IPv6 TACACS+ server from configuration, use the no form of this command.

server name server-name

no server name server-name

Syntax Description

server-name

The IPv6 TACACS+ server to be used.

Command Default

No server name is specified.

Command Modes


TACACS+ group server configuration (config-sg-tacacs+)

Command History

Release

Modification

Cisco IOS XE Release 3.2S

This command was introduced.

Cisco IOS XE Release 3.2SE

This command was integrated into Cisco IOS XE Release 3.2SE.

Usage Guidelines

You must configure the aaa group server tacacs command before configuring this command.

Enter the server name command to specify an IPv6 TACACS+ server.

Examples

The following example shows how to specify an IPv6 TACACS+ server named server1: 


Router(config)# aaa group server tacacs+
Router(config-sg-tacacs+)# server name server1

Related Commands

Command

Description

aaa group server tacacs

Configures the TACACS+ server for IPv6 or IPv4 and enters TACACS+ server configuration mode.

set ipv6 default next-hop

To specify an IPv6 default next hop to which matching packets are forwarded, use the set ipv6 default next-hop command in route-map configuration mode. To delete the default next hop, use the no form of this command.

set ipv6 default [vrf vrf-name | global] next-hop global-ipv6-address [global-ipv6-address...]

no set ipv6 default [vrf vrf-name | global] next-hop global-ipv6-address [global-ipv6-address...]

Syntax Description

vrf vrf-name

(Optional) Specifies explicitly that the default next-hops are under the specific Virtual Routing and Forwarding (VRF) instance.

global

(Optional) Specifies explicitly that the default next-hops are under the global routing table.

global-ipv6-address

IPv6 global address of the next hop to which packets are output. The next-hop router must be an adjacent router.

This argument must be in the form documented in RFC 2373, where the address is specified in hexadecimal using 16-bit values between colons.

Command Default

Packets are not forwarded to a default next hop.

Command Modes

Route-map configuration (config-route-map)

Command History

Release

Modification

12.3(7)T

This command was introduced.

12.2(30)S

This command was integrated into Cisco IOS Release 12.2(30)S.

12.2(33)SXI4

This command was integrated into Cisco IOS Release 12.2(33)SXI4.

Cisco IOS XE Release 3.2S

This command was modified. It was integrated into Cisco IOS XE Release 3.2S.

15.1(1)SY

This command was integrated into Cisco IOS Release 15.1(1)SY.

Usage Guidelines

An ellipsis (...) in the command syntax indicates that your command input can include multiple values for the global-ipv6-address argument.

Use the set ipv6 default next-hop command in policy-based routing PBR for IPv6 to specify an IPv6 next-hop address to which a packet is policy routed when the router has no route in the IPv6 routing table or the packets match the default route. The IPv6 next-hop address must be adjacent to the router; that is, reachable by using a directly connected IPv6 route in the IPv6 routing table. The IPv6 next-hop address also must be a global IPv6 address. An IPv6 link-local address cannot be used because the use of an IPv6 link-local address requires interface context.

If the software has no explicit route for the destination in the packet, then the software routes the packet to the next hop as specified by the set ipv6 default next-hop command. The optional specified IPv6 addresses are tried in turn.

Use the ipv6 policy route-map command, the route-map command, and the match and set route-map commands to define the conditions for PBR packets. The ipv6 policy route-map command identifies a route map by name. Each route-map command has a list of match and set commands associated with it. The match commands specify the match criteria, which are the conditions under which PBR occurs. The set commands specify the set actions, which are the particular routing actions to perform if the criteria enforced by the match commands are met.

The set clauses can be used in conjunction with one another. They are evaluated in the following order:

  1. set ipv6 next-hop

  2. set interface

  3. set ipv6 default next-hop

  4. set default interface


Note

The set ipv6 next-hop and set ipv6 default next-hop are similar commands. The set ipv6 next-hop command is used to policy route packets for which the router has a route in the IPv6 routing table. The set ipv6 default next-hop command is used to policy route packets for which the router does not have a route in the IPv6 routing table (or the packets match the default route).

Examples

The following example shows how to set the next hop to which the packet is routed: 


ipv6 access-list match-dst-1
  permit ipv6 any 2001:DB8:4:1::1/64 any
route-map pbr-v6-default
  match ipv6 address match-dst-1
  set ipv6 default next-hop 2001:DB8:4:4::1/64

Related Commands

Command

Description

ipv6 local policy route-map

Identifies a route map to use for local IPv6 PBR.

ipv6 policy route-map

Configures IPv6 policy-based routing (PBR) on an interface.

match ipv6 address

Specifies an IPv6 access list to use to match packets for PBR for IPv6.

match length

Bases policy routing on the Level 3 length of a packet.

route-map (IP)

Defines the conditions for redistributing routes from one routing protocol into another, or to enable policy routing.

set default interface

Indicates where to output packets that pass a match clause of a route map for policy routing and have no explicit route to the destination.

set interface

Indicates where to output packets that pass a match clause of a route map for policy routing.

set ipv6 next-hop (PBR)

Indicates where to output IPv6 packets that pass a match clause of a route map for policy routing.

set ipv6 precedence

Sets the precedence value in the IPv6 packet header.

set ipv6 next-hop (BGP)

To indicate where to output IPv6 packets that pass a match clause of a route map for policy routing, use the set ipv6 next-hop command in route-map configuration mode. To delete an entry, use the no form of this command.

set ipv6 next-hop {ipv6-address [link-local-address] | encapsulate l3vpn profile name | peer-address}

no set ipv6 next-hop {ipv6-address [link-local-address] | encapsulate l3vpn profile name | peer-address}

Syntax Description

ipv6-address

IPv6 global address of the next hop to which packets are output. It need not be an adjacent router.

This argument must be in the form documented in RFC 2373 where the address is specified in hexadecimal using 16-bit values between colons.

link-local-address

(Optional) IPv6 link-local address of the next hop to which packets are output. It must be an adjacent router.

This argument must be in the form documented in RFC 2373 where the address is specified in hexadecimal using 16-bit values between colons.

encapsulate l3vpn

Sets the encapsulation profile for VPN nexthop.

profile name

Name of the Layer 3 encapsulation profile.

peer-address

(Optional) Sets the next hop to be the BGP peering address.

Command Default

IPv6 packets are forwarded to the next hop router in the routing table.

Command Modes


Route-map configuration (config-route-map)

Command History

Release

Modification

12.2(4)T

This command was introduced.

12.0(21)ST

This command was integrated into Cisco IOS Release 12.0(21)ST.

12.0(22)S

This command was integrated into Cisco IOS Release 12.0(22)S.

12.2(14)S

This command was integrated into Cisco IOS Release 12.2(14)S.

12.2(25)SG

This command was integrated into Cisco IOS Release 12.2(25)SG.

Cisco IOS XE Release 2.1

This command was introduced on Cisco ASR 1000 Series Routers.

12.2(33)SRE

This command was modified. The encapsulate l3vpn keyword was added.

Usage Guidelines

The set ipv6 next-hop command is similar to the set ip next-hop command, except that it is IPv6-specific.

The set commands specify the set actions --the particular routing actions to perform if the criteria enforced by the match commands are met.

When the set ipv6 next-hop command is used with the peer-address keyword in an inbound route map of a BGP peer, the next hop of the received matching routes will be set to be the neighbor peering address, overriding any third-party next hops. So the same route map can be applied to multiple BGP peers to override third-party next hops.

When the set ipv6 next-hop command is used with the peer-address keyword in an outbound route map of a BGP peer, the next hop of the advertised matching routes will be set to be the peering address of the local router, thus disabling the next hop calculation. The set ipv6 next-hop command has finer granularity than the per-neighbor neighbor next-hop-self command, because you can set the next hop for some routes, but not others. The neighbor next-hop-self command sets the next hop for all routes sent to that neighbor.

The set clauses can be used in conjunction with one another. They are evaluated in the following order:

  1. set ipv6 next-hop

  2. set interface

  3. set ipv6 default next-hop

  4. set default interface

Configuring the set ipv6 next-hop ipv6-address command on a VRF interface allows the next hop to be looked up in a specified VRF address family. In this context, the ipv6-address argument matches that of the specified VRF instance.

Examples

The following example configures the IPv6 multiprotocol BGP peer FE80::250:BFF:FE0E:A471 and sets the route map named nh6 to include the IPv6 next hop global addresses of Fast Ethernet interface 0 of the neighbor in BGP updates. The IPv6 next hop link-local address can be sent to the neighbor by the nh6 route map or from the interface specified by the neighbor update-source router configuration command. 


router bgp 170
 neighbor FE80::250:BFF:FE0E:A471 remote-as 150
 neighbor FE80::250:BFF:FE0E:A471 update-source fastether 0
address-family ipv6
  neighbor FE80::250:BFF:FE0E:A471 activate
  neighbor FE80::250:BFF:FE0E:A471 route-map nh6 out
route-map nh6
 set ipv6 next-hop 3FFE:506::1

Note

If you specify only the global IPv6 next hop address (the ipv6-address argument) with the set ipv6 next-hop command after specifying the neighbor interface (the interface-type argument) with the neighbor update-source command, the link-local address of the neighbor interface is included as the next hop in the BGP updates. Therefore, only one route map that sets the global IPv6 next hop address in BGP updates is required for multiple BGP peers that use link-local addresses.

Related Commands

Command

Description

ip policy route-map

Identifies a route map to use for policy routing on an interface.

match ipv6 address

Distributes IPv6 routes that have a prefix permitted by a prefix list.

match ipv6 next-hop

Distributes IPv6 routes that have a next hop prefix permitted by a prefix list.

match ipv6 route-source

Distributes IPv6 routes that have been advertised by routers at an address specified by a prefix list.

neighbor next-hop-self

Disables next-hop processing of BGP updates on the router.

neighbor update-source

Specifies that the Cisco IOS software allow BGP sessions to use any operational interface for TCP connections

route-map (IP)

Defines the conditions for redistributing routes from one routing protocol into another, or enables policy routing.

set ipv6 next-hop (PBR)

To indicate where to output IPv6 packets that pass a match clause of a route map for policy-based routing (PBR), use the set ipv6 next-hop command in route-map configuration mode. To delete an entry, use the no form of this command.

set ipv6 next-hop {next-hop-ipv6-address [next-hop-ipv6-address...] | encapsulate l3vpn encapsulation-profile | peer-address | recursive next-hop-ipv6-address | verify-availability next-hop-ipv6-address sequence track object-number}

no set ipv6 next-hop {next-hop-ipv6-address [next-hop-ipv6-address...] | encapsulate l3vpn encapsulation-profile | peer-address | recursive next-hop-ipv6-address | verify-availability next-hop-ipv6-address sequence track object-number}

Syntax Description

next-hop-ipv6-address [next-hop-ipv6-address ...]

IPv6 global address of the next hop to which packets are sent. The next-hop router must be an adjacent router.

The IPv6 address must be specified in hexadecimal using 16-bit values between colons as specified in RFC 2373.

encapsulate

Specifies the encapsulation profile for the next-hop VPN.

l3vpn

Specifies Layer 3 VPN encapsulation.

encapsulation-profile

Encapsulation profile name.

peer-address

Specifies the peer address. This keyword is specific to Border Gateway Protocol (BGP).

recursive next-hop-ipv6-address
Specifies the IPv6 address of the recursive next-hop router.

  • The next-hop IPv6 address must be assigned separately from the recursive next-hop IPv6 address.

verify-availability

Verifies if the next-hop router is reachable.

sequence

Sequence number to insert into the next-hop list. Valid values for the sequence argument are from 1 to 65535.

track object-number

Sets the next-hop router depending on the state of a tracked object number. Valid values for the object-number argument are from 1 to 1000.

Command Default

Packets are not forwarded to a default next hop.

Command Modes


Route-map configuration (config-route-map)

Command History

Release

Modification

12.3(7)T

This command was introduced.

12.2(30)S

This command was integrated into Cisco IOS Release 12.2(30)S.

12.2(33)SXI4

This command was integrated into Cisco IOS Release 12.2(33)SXI4.

Cisco IOS XE Release 3.2S

This command was integrated into Cisco IOS XE Release 3.2S.

15.1(1)SY

This command was integrated into Cisco IOS Release 15.1(1)SY.

15.4(2)S

This command was modified. The recursive keyword was added.

Usage Guidelines

The set ipv6 next-hop command is similar to the set ip next-hop command, except that it is IPv6-specific.

An ellipsis (...) in the command syntax indicates that your command input can include multiple values for the next-hop-ipv6-address argument. You must specify an IPv6 address; an IPv6 link-local address cannot be used because the use of an IPv6 link-local address requires interface context.

The next-hop-ipv6-address argument must specify an address that is configured in the IPv6 Routing Information Base (RIB) and is directly connected. A directly connected address is covered by an IPv6 prefix configured on an interface, or an address covered by an IPv6 prefix specified on a directly connected static route.

Examples

The following example shows how to set the next hop to which packets are routed: 


ipv6 access-list match-dst-1
  permit ipv6 any 2001:DB8::1 any
!
route-map pbr-v6-default
  match ipv6 address match-dst-1
  set ipv6 next-hop 2001:DB8::F

Related Commands

Command

Description

ipv6 local policy route-map

Identifies a route map to use for local IPv6 PBR.

ipv6 policy route-map

Configures IPv6 PBR on an interface.

match ipv6 address

Specifies an IPv6 access list to use to match packets for PBR for IPv6.

match length

Bases policy routing on the Level 3 length of a packet.

route-map (IP)

Defines the conditions for redistributing routes from one routing protocol into another, or enables policy routing.

set default interface

Indicates where to output packets that pass a match clause of a route map for policy routing and have no explicit route to the destination.

set interface

Indicates where to output packets that pass a match clause of a route map for policy routing.

set ipv6 default next-hop

Specifies an IPv6 default next hop to which matching packets are forwarded.

set ipv6 precedence

Sets the precedence value in the IPv6 packet header.

set ipv6 precedence

To set the precedence value in the IPv6 packet header, use the set ipv6 precedence command in route-map configuration mode. To remove the precedence value, use the no form of this command.

set ipv6 precedence precedence-value

no set ipv6 precedence precedence-value

Syntax Description

precedence-value

A number from 0 to 7 that sets the precedence bit in the packet header.

Command Modes


Route-map configuration (config-route-map)

Command History

Release

Modification

12.3(7)T

This command was introduced.

12.2(30)S

This command was integrated into Cisco IOS Release 12.2(30)S.

12.2(33)SXI4

This command was integrated into Cisco IOS Release 12.2(33)SXI4.

Cisco IOS XE Release 3.2S

This command was integrated into Cisco IOS XE Release 3.2S.

15.1(1)SY

This command was integrated into Cisco IOS Release 15.1(1)SY.

Usage Guidelines

The way the network gives priority (or some type of expedited handling) to the marked traffic is through the application of weighted fair queueing (WFQ) or weighted random early detection (WRED) at points downstream in the network. Typically, you would set IPv6 precedence at the edge of the network (or administrative domain) and have queueing act on it thereafter. WFQ can speed up handling for high precedence traffic at congestion points. WRED ensures that high precedence traffic has lower loss rates than other traffic during times of congestion.

The mapping from keywords such as routine and priority to a precedence value is useful only in some instances. That is, the use of the precedence bit is evolving. You can define the meaning of a precedence value by enabling other features that use the value. In the case of Cisco high-end Internet quality of service (QoS), IPv6 precedences can be used to establish classes of service that do not necessarily correspond numerically to better or worse handling in the network. For example, IPv6 precedence 2 can be given 90 percent of the bandwidth on output links in the network, and IPv6 precedence 6 can be given 5 percent using the distributed weight fair queueing (DWFQ) implementation on the Versatile Interface Processors (VIPs).

Use the route-map global configuration command with match and set route-map configuration commands to define the conditions for redistributing routes from one routing protocol into another, or for policy routing. Each route-map command has a list of match and set commands associated with it. The match commands specify the match criteria—the conditions under which redistribution or policy routing is allowed for the current route-map command. The set commands specify the set actions—the particular redistribution or policy routing actions to perform if the criteria enforced by the match commands are met. The no route-map command deletes the route map.

The set route-map configuration commands specify the redistribution set actions to be performed when all the match criteria of a route map are met. When all match criteria are met, all set actions are performed.

Examples

The following example sets the IPv6 precedence value to 5 for packets that pass the route map match: 


interface serial 0
 ipv6 policy route-map texas
! 
route-map cisco1 
 match length 68 128 
 set ipv6 precedence 5

Related Commands

Command

Description

ipv6 local policy route-map

Identifies a route map to use for local IPv6 PBR.

ipv6 policy route-map

Configures IPv6 PBR on an interface.

match ipv6 address

Specifies an IPv6 access list to use to match packets for PBR for IPv6.

match length

Bases policy routing on the Level 3 length of a packet.

route-map (IP)

Defines the conditions for redistributing routes from one routing protocol into another, or enables policy routing.

set default interface

Indicates where to output packets that pass a match clause of a route map for policy routing and have no explicit route to the destination.

set interface

Indicates where to output packets that pass a match clause of a route map for policy routing.

set ipv6 default next-hop

Specifies an IPv6 default next hop to which matching packets will be forwarded.

set ipv6 next-hop

Indicates where to output IPv6 packets that pass a match clause of a route map for policy routing.

set ipv6 precedence

Sets the precedence value in the IPv6 packet header.

show bgp ipv6

To display entries in the IPv6 Border Gateway Protocol (BGP) routing table, use the show bgp ipv6 command in user EXEC or privileged EXEC mode.

show bgp ipv6 {unicast | multicast} [ipv6-prefix/prefix-length] [longer-prefixes] [labels]

Syntax Description

unicast

Specifies IPv6 unicast address prefixes.

multicast

Specifies IPv6 multicast address prefixes.

ipv6-prefix

(Optional) IPv6 network number, entered to display a particular network in the IPv6 BGP routing table.

This argument must be in the form documented in RFC 2373 where the address is specified in hexadecimal using 16-bit values between colons.

/ prefix-length

(Optional) The length of the IPv6 prefix. A decimal value that indicates how many of the high-order contiguous bits of the address comprise the prefix (the network portion of the address). A slash mark must precede the decimal value.

longer-prefixes

(Optional) Displays the route and more specific routes.

labels

(Optional) Displays Multiprotocol Label Switching (MPLS) label information.

Command Modes


User EXEC
Privileged EXEC

Command History

Release

Modification

12.2(2)T

This command was introduced.

12.0(21)ST

This command was integrated into Cisco IOS Release 12.0(21)ST.

12.0(22)S

MPLS label information was added to the display.

12.2(14)S

This command was integrated into Cisco IOS Release 12.2(14)S.

12.3(2)T

MPLS label value advertised for the IPv6 prefix was added to the display.

12.0(26)S

The unicast and multicast keywords were added.

12.2(25)S

6PE multipath information was added to the display.

12.2(28)SB

This command was integrated into Cisco IOS Release 12.2(28)SB.

12.2(25)SG

This command was integrated into Cisco IOS Release 12.2(25)SG.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

12.2(33)SXH

This command was integrated into Cisco IOS Release 12.2(33)SXH.

Cisco IOS XE Release 2.1

This command was introduced on Cisco ASR 1000 series routers.

15.2(2)SNI

This command was implemented on the Cisco ASR 901 Series Aggregation Services Routers.

Usage Guidelines

The show bgp ipv6 command provides output similar to the show ip bgp command, except that it is IPv6-specific.

Examples

The following is sample output from the show bgp ipv6 command: 


Router# show bgp ipv6 unicast
BGP table version is 12612, local router ID is 172.16.7.225
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
   Network          Next Hop            Metric LocPrf Weight Path
*                   3FFE:C00:E:C::2                        0 3748 4697 1752 i
*                   3FFE:1100:0:CC00::1
                                                           0 1849 1273 1752 i
*  2001:618:3::/48  3FFE:C00:E:4::2          1             0 4554 1849 65002 i
*>                  3FFE:1100:0:CC00::1
                                                           0 1849 65002 i
*  2001:620::/35    2001:0DB8:0:F004::1
                                                           0 3320 1275 559 i
*                   3FFE:C00:E:9::2                        0 1251 1930 559 i
*                   3FFE:3600::A                           0 3462 10566 1930 559 i
*                   3FFE:700:20:1::11
                                                           0 293 1275 559 i
*                   3FFE:C00:E:4::2          1             0 4554 1849 1273 559 i
*                   3FFE:C00:E:B::2                        0 237 3748 1275 559 i

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

Table 1. show bgp ipv6 Field Descriptions

Field

Description

BGP table version

Internal version number of the table. This number is incremented whenever the table changes.

local router ID

A 32-bit number written as 4 octets separated by periods (dotted decimal format).

Status codes

Status of the table entry. The status is displayed at the beginning of each line in the table. It can be one of the following values:

  • s--The table entry is suppressed.

  • d--The table entry is dampened.

  • h--The table entry is history.

  • *--The table entry is valid.

  • >--The table entry is the best entry to use for that network.

  • i--The table entry was learned via an internal BGP session.

Origin codes

Indicates the origin of the entry. The origin code is placed at the end of each line in the table. It can be one of the following values:

  • i--Entry originated from the Interior Gateway Protocol (IGP) and was advertised with a network router configuration command.

  • e--Entry originated from the Exterior Gateway Protocol (EGP).

  • ?--Origin of the path is not clear. Usually, this is a router that is redistributed into BGP from an IGP.

Network

IPv6 address of a network entity.

Next Hop

IPv6 address of the next system that is used when forwarding a packet to the destination network. An entry of two colons (::) indicates that the router has some non-BGP routes to this network.

Metric

If shown, this is the value of the interautonomous system metric.

LocPrf

Local preference value as set with the set local-preference route-map configuration command. The default value is 100.

Weight

Weight of the route as set via autonomous system filters.

Path

Autonomous system paths to the destination network. There can be one entry in this field for each autonomous system in the path.

The following is sample output from the show bgp ipv6 command, showing information for prefix 3FFE:500::/24: 


Router# show bgp ipv6 unicast 3FFE:500::/24
BGP routing table entry for 3FFE:500::/24, version 19421
Paths: (6 available, best #1)
  Advertised to peer-groups:
     6BONE
  293 3425 2500
    3FFE:700:20:1::11 from 3FFE:700:20:1::11 (192.168.2.27)
      Origin IGP, localpref 100, valid, external, best
  4554 293 3425 2500
    3FFE:C00:E:4::2 from 3FFE:C00:E:4::2 (192.168.1.1)
      Origin IGP, metric 1, localpref 100, valid, external
  33 293 3425 2500
    3FFE:C00:E:5::2 from 3FFE:C00:E:5::2 (209.165.18.254)
      Origin IGP, localpref 100, valid, external
      Dampinfo: penalty 673, flapped 429 times in 10:47:45
  6175 7580 2500
    3FFE:C00:E:1::2 from 3FFE:C00:E:1::2 (209.165.223.204)
      Origin IGP, localpref 100, valid, external
1849 4697 2500, (suppressed due to dampening)
    3FFE:1100:0:CC00::1 from 3FFE:1100:0:CC00::1 (172.31.38.102)
      Origin IGP, localpref 100, valid, external
      Dampinfo: penalty 3938, flapped 596 times in 13:03:06, reuse in 00:59:10
237 10566 4697 2500
    3FFE:C00:E:B::2 from 3FFE:C00:E:B::2 (172.31.0.3)
      Origin IGP, localpref 100, valid, external

The following is sample output from the show bgp ipv6 command, showing MPLS label information for an IPv6 prefix that is configured to be an IPv6 edge router using MPLS: 


Router# show bgp ipv6 unicast 2001:0DB8::/32
BGP routing table entry for 2001:0DB8::/32, version 15
Paths: (1 available, best #1)
  Not advertised to any peer
  Local
    ::FFFF:192.168.99.70 (metric 20) from 192.168.99.70 (192.168.99.70)
      Origin IGP, localpref 100, valid, internal, best, mpls label 17

To display the top of the stack label with label switching information, enter the show bgp ipv6 EXEC command with the labels keyword: 


Router# show bgp ipv6 unicast labels
Network              Next Hop               In tag/Out tag
2001:0DB8::/32       ::FFFF:192.168.99.70   notag/20

Note

If a prefix has not been advertised to any peer, the display shows "Not advertised to any peer."

The following is sample output from the show bgp ipv6 command, showing 6PE multipath information. The prefix 4004::/64 is received by BGP from two different peers and therefore two different paths: 


Router# show bgp ipv6 unicast 
BGP table version is 28, local router ID is 172.10.10.1
Status codes:s suppressed, d damped, h history, * valid, > best, i - 
internal,
              r RIB-failure, S Stale
Origin codes:i - IGP, e - EGP, ? - incomplete
   Network          Next Hop            Metric LocPrf Weight Path
*>i4004::/64        ::FFFF:172.11.11.1
                                             0    100      0 ?
* i                 ::FFFF:172.30.30.1
                                             0    100      0 ?

Related Commands

Command

Description

clear bgp ipv6

Resets an IPv6 BGP connection or session.

neighbor soft-reconfiguration

Configures the Cisco IOS software to start storing updates.

show bgp ipv6 community

To display routes that belong to specified IPv6 Border Gateway Protocol (BGP) communities, use the show bgp ipv6 community command in user EXEC or privileged EXEC mode.

show bgp ipv6 {unicast | multicast} community [community-number] [exact-match] [local-as | no-advertise | no-export]

Syntax Description

unicast

Specifies IPv6 unicast address prefixes.

multicast

Specifies IPv6 multicast address prefixes.

community-number

(Optional) Valid value is a community number in the range from 1 to 4294967295 or AA:NN (autonomous system-community number:2-byte number).

exact-match

(Optional) Displays only routes that have an exact match.

local-as

(Optional) Displays only routes that are not sent outside of the local autonomous system (well-known community).

no-advertise

(Optional) Displays only routes that are not advertised to any peer (well-known community).

no-export

(Optional) Displays only routes that are not exported outside of the local autonomous system (well-known community).

Command Modes


User EXEC
Privileged EXEC

Command History

Release

Modification

12.2(2)T

This command was introduced.

12.0(21)ST

This command was integrated into Cisco IOS Release 12.0(21)ST.

12.0(22)S

This command was integrated into Cisco IOS Release 12.0(22)S.

12.2(14)S

This command was integrated into Cisco IOS Release 12.2(14)S.

12.3(2)T

The unicast and exact-match keywords were added.

12.0(26)S

The unicast and multicast keywords were added.

12.3(4)T

The multicast keyword was added.

12.2(28)SB

This command was integrated into Cisco IOS Release 12.2(28)SB.

12.2(25)SG

This command was integrated into Cisco IOS Release 12.2(25)SG.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

12.2(33)SXH

This command was integrated into Cisco IOS Release 12.2(33)SXH.

Usage Guidelines

The show bgp ipv6 community command provides output similar to the show ip bgp community command, except it is IPv6-specific.

Communities are set with the set community route-map configuration command. You must enter the numerical communities before the well-known communities. For example, the following string is not valid: 


Router# show ipv6 bgp community local-as 111:12345

Use one of the following strings instead: 


Router# show ipv6 bgp community 111:12345 local-as
Router# show ipv6 bgp unicast community 111:12345 local-as

The unicast keyword is available in Cisco IOS Release 12.3(2)T and later releases. It is not available in releases prior to 12.3(2)T. Use of the unicast keyword is mandatory starting with Cisco IOS Release 12.3(2)T.

The multicast keyword is available in Cisco IOS Release 12.0(26)S and later releases. It is not available in releases prior to 12.0(26)S. Use of either the unicast or multicast keyword is mandatory starting with Cisco IOS Release 12.0(26)S.

Examples

The following is sample output from the show bgp ipv6 community command:


Note

The output is the same whether or not the unicast or multicast keyword is used. The unicast keyword is available in Cisco IOS Release 12.3(2)T and Cisco IOS Release 12.0(26)S and later releases, and the multicast keyword is available only in Cisco IOS Release 12.0(26)S and later releases. 


BGP table version is 69, local router ID is 10.2.64.5
Status codes:s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes:i - IGP, e - EGP, ? - incomplete
       Network               Next Hop              Metric LocPrf Weight Path
*> 2001:0DB8:0:1::1/64       ::                                       0 32768 i
*> 2001:0DB8:0:1:1::/80      ::                                       0 32768 ?
*> 2001:0DB8:0:2::/64        2001:0DB8:0:3::2                            0 2 i
*> 2001:0DB8:0:2:1::/80      2001:0DB8:0:3::2                            0 2 ?
* 2001:0DB8:0:3::1/64        2001:0DB8:0:3::2                            0 2 ?
*>                        ::                                       0 32768 ?
*> 2001:0DB8:0:4::/64        2001:0DB8:0:3::2                            0 2 ?
*> 2001:0DB8:0:5::1/64       ::                                       0 32768 ?
*> 2001:0DB8:0:6::/64        2000:0:0:3::2                            0 2 3 i
*> 2010::/64                 ::                                       0 32768 ?
*> 2020::/64                 ::                                       0 32768 ?
*> 2030::/64                 ::                                       0 32768 ?
*> 2040::/64                 ::                                       0 32768 ?
*> 2050::/64                 ::                                       0 32768 ?

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

Table 2. show bgp ipv6 community Field Descriptions

Field

Description

BGP table version

Internal version number of the table. This number is incremented whenever the table changes.

local router ID

A 32-bit number written as 4 octets separated by periods (dotted-decimal format).

Status codes

Status of the table entry. The status is displayed at the beginning of each line in the table. It can be one of the following values:

s--The table entry is suppressed.

d--The table entry is dampened.

h--The table entry is history.

*--The table entry is valid.

>--The table entry is the best entry to use for that network.

i--The table entry was learned via an internal BGP session.

Origin codes

Indicates the origin of the entry. The origin code is placed at the end of each line in the table. It can be one of the following values:

i--Entry originated from the Interior Gateway Protocol (IGP) and was advertised with a network router configuration command.

e--Entry originated from the Exterior Gateway Protocol (EGP).

?--Origin of the path is not clear. Usually, this is a router that is redistributed into BGP from an IGP.

Network

IPv6 address of a network entity.

Next Hop

IPv6 address of the next system that is used when forwarding a packet to the destination network. An entry of two colons (::) indicates that the router has some non-BGP routes to this network.

Metric

The value of the interautonomous system metric. This field is frequently not used.

LocPrf

Local preference value as set with the set local-preference route-map configuration command. The default value is 100.

Weight

Weight of the route as set via autonomous system filters.

Path

Autonomous system paths to the destination network. There can be one entry in this field for each autonomous system in the path.

Related Commands

Command

Description

clear bgp ipv6

Resets an IPv6 BGP connection or session.

ip bgp-community new-format

Displays BGP communities in the format AA:NN (autonomous system-community number:2-byte number).

neighbor soft-reconfiguration

Configures the Cisco IOS software to start storing updates.

show bgp ipv6 community-list

To display routes that are permitted by the IPv6 Border Gateway Protocol (BGP) community list, use the show bgp ipv6 community-list command in user EXEC or privileged EXEC mode.

show bgp ipv6 {unicast | multicast} community-list {number | name} [exact-match]

Syntax Description

unicast

Specifies IPv6 unicast address prefixes.

multicast

Specifies IPv6 multicast address prefixes.

number

Community list number in the range from 1 to 199.

name

Community list name.

exact-match

(Optional) Displays only routes that have an exact match.

Command Modes


User EXEC
Privileged EXEC

Command History

Release

Modification

12.2(2)T

This command was introduced.

12.0(21)ST

This command was integrated into Cisco IOS Release 12.0(21)ST.

12.0(22)S

This command was integrated into Cisco IOS Release 12.0(22)S.

12.2(14)S

This command was integrated into Cisco IOS Release 12.2(14)S.

12.3(2)T

The unicast keyword was added.

12.0(26)S

The unicast and multicast keywords were added.

12.3(4)T

The multicast keyword was added.

12.2(28)SB

This command was integrated into Cisco IOS Release 12.2(28)SB.

12.2(25)SG

This command was integrated into Cisco IOS Release 12.2(25)SG.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

12.2(33)SXH

This command was integrated into Cisco IOS Release 12.2(33)SXH.

Usage Guidelines

The show bgp ipv6 unicast community-list and show bgp ipv6 multicast community-list commands provide output similar to the show ip bgp community-list command, except they are IPv6-specific.

The unicast keyword is available in Cisco IOS Release 12.3(2)T and later releases. It is not available in releases prior to 12.3(2)T. Use of the unicast keyword is mandatory starting with Cisco IOS Release 12.3(2)T.

The multicast keyword is available in Cisco IOS Release 12.0(26)S and later releases. It is not available in releases prior to 12.0(26)S. Use of either the unicast or multicast keyword is mandatory starting with Cisco IOS Release 12.0(26)S.

Examples

The following is sample output of the show bgp ipv6 community-list command for community list number 3:


Note

The output is the same whether or not the unicast or multicast keyword is used. The unicast keyword is available in Cisco IOS Release 12.3(2)T and Cisco IOS Release 12.0(26)S and later releases, and the multicast keyword is available only in Cisco IOS Release 12.0(26)S and later releases. 


Router# show bgp ipv6 unicast community-list 3
BGP table version is 14, local router ID is 10.2.64.6
Status codes:s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes:i - IGP, e - EGP, ? - incomplete
    Network                 Next Hop            Metric LocPrf Weight Path
*> 2001:0DB8:0:1::/64       2001:0DB8:0:3::1                         0 1 i
*> 2001:0DB8:0:1:1::/80     2001:0DB8:0:3::1                         0 1 i
*> 2001:0DB8:0:2::1/64      ::                                    0 32768 i
*> 2001:0DB8:0:2:1::/80     ::                                    0 32768 ?
* 2001:0DB8:0:3::2/64       2001:0DB8:0:3::1                         0 1 ?
*>                       ::                                    0 32768 ?
*> 2001:0DB8:0:4::2/64      ::                                    0 32768 ?
*> 2001:0DB8:0:5::/64       2001:0DB8:0:3::1                         0 1 ?
*> 2010::/64                2001:0DB8:0:3::1                         0 1 ?
*> 2020::/64                2001:0DB8:0:3::1                         0 1 ?
*> 2030::/64                2001:0DB8:0:3::1                         0 1 ?
*> 2040::/64                2001:0DB8:0:3::1                         0 1 ?
*> 2050::/64                2001:0DB8:0:3::1                         0 1 ?

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

Table 3. show bgp ipv6 community-list Field Descriptions

Field

Description

BGP table version

Internal version number of the table. This number is incremented whenever the table changes.

local router ID

A 32-bit number written as 4 octets separated by periods (dotted-decimal format).

Status codes

Status of the table entry. The status is displayed at the beginning of each line in the table. It can be one of the following values:

  • s--The table entry is suppressed.

  • d--The table entry is dampened.

  • h--The table entry is history.

  • *--The table entry is valid.

  • >--The table entry is the best entry to use for that network.

  • i--The table entry was learned via an internal BGP session.

Origin codes

Indicates the origin of the entry. The origin code is placed at the end of each line in the table. It can be one of the following values:

  • i--Entry originated from the Interior Gateway Protocol (IGP) and was advertised with a network router configuration command.

  • e--Entry originated from the Exterior Gateway Protocol (EGP).

  • ?--Origin of the path is not clear. Usually, this is a router that is redistributed into BGP from an IGP.

Network

IPv6 address of a network entity.

Next Hop

IPv6 address of the next system that is used when forwarding a packet to the destination network. An entry of two colons (::) indicates that the router has some non-BGP routes to this network.

Metric

The value of the interautonomous system metric. This field is frequently not used.

LocPrf

Local preference value as set with the set local-preference route-map configuration command. The default value is 100.

Weight

Weight of the route as set via autonomous system filters.

Path

Autonomous system paths to the destination network. There can be one entry in this field for each autonomous system in the path.

Related Commands

Command

Description

clear bgp ipv6

Resets an IPv6 BGP connection or session.

neighbor soft-reconfiguration

Configures the Cisco IOS software to start storing updates.

show bgp ipv6 dampened-paths

To display IPv6 Border Gateway Protocol (BGP) dampened routes, use the show bgp ipv6 dampened-paths command in user EXEC or privileged EXEC mode.

show bgp ipv6 {unicast | multicast} dampening dampened-paths

Syntax Description

unicast

Specifies IPv6 unicast address prefixes.

multicast

Specifies IPv6 multicast address prefixes.

dampening

Displays detailed information about dampening.

Command Modes


User EXEC
Privileged EXEC

Command History

Release

Modification

12.2(2)T

This command was introduced.

12.0(21)ST

This command was integrated into Cisco IOS Release 12.0(21)ST.

12.0(22)S

This command was integrated into Cisco IOS Release 12.0(22)S.

12.2(14)S

This command was integrated into Cisco IOS Release 12.2(14)S.

12.3(2)T

The unicast and dampening keywords were added.

12.0(26)S

The unicast and multicast keywords were added.

12.3(4)T

The multicast keyword was added.

12.2(28)SB

This command was integrated into Cisco IOS Release 12.2(28)SB.

12.2(25)SG

This command was integrated into Cisco IOS Release 12.2(25)SG.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

12.2(33)SXH

This command was integrated into Cisco IOS Release 12.2(33)SXH.

Cisco IOS XE Release 2.1

This command was introduced on Cisco ASR 1000 Series Routers.

Usage Guidelines

The show bgp ipv6 dampened-paths and show bgp ipv6 unicast dampening dampened-paths commands provide output similar to the show ip bgp dampened-paths command, except they are IPv6-specific.

The unicast keyword is available in Cisco IOS Release 12.3(2)T and later releases. It is not available in releases prior to 12.3(2)T. Use of the unicast keyword is mandatory starting with Cisco IOS Release 12.3(2)T.

The multicast keyword is available in Cisco IOS Release 12.0(26)S and later releases. It is not available in releases prior to 12.0(26)S. Use of either the unicast or multicast keyword is mandatory starting with Cisco IOS Release 12.0(26)S.

Examples

The following is sample output from the show bgp ipv6 dampened-paths command:


Note

The command output is the same whether or not the unicast, multicast, and dampening keywords are used. The unicast and dampening keywords are available only in Cisco IOS Release 12.3(2)T and Cisco IOS Release 12.0(26)S and later releases, and the multicast keyword is available only in Cisco IOS Release 12.0(26)S and later releases. 


Router# show bgp ipv6 unicast dampening dampened-paths
BGP table version is 12610, local router ID is 192.168.7.225
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
   Network          From             Reuse    Path
*d 3FFE:1000::/24   3FFE:C00:E:B::2  00:00:10 237 2839 5609 i
*d 2001:228::/35    3FFE:C00:E:B::2  00:23:30 237 2839 5609 2713 i

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

Table 4. show bgp ipv6 dampened-paths Field Descriptions

Field

Description

BGP table version

Internal version number of the table. This number is incremented whenever the table changes.

local router ID

A 32-bit number written as 4 octets separated by periods (dotted-decimal format).

Status codes

Status of the table entry. The status is displayed at the beginning of each line in the table. It can be one of the following values:

s--The table entry is suppressed.

d--The table entry is dampened.

h--The table entry is history.

*--The table entry is valid.

>--The table entry is the best entry to use for that network.

i--The table entry was learned via an internal BGP session.

Origin codes

Indicates the origin of the entry. The origin code is placed at the end of each line in the table. It can be one of the following values:

i--Entry originated from the Interior Gateway Protocol (IGP) and was advertised with a network router configuration command.

e--Entry originated from the Exterior Gateway Protocol (EGP).

?--Origin of the path is not clear Usually, this is a router that is redistributed into BGP from an IGP.

Network

Indicates the network to which the route is dampened.

From

IPv6 address of the peer that advertised this path.

Reuse

Time (in hours:minutes:seconds) after which the path will be made available.

Path

Autonomous system path of the route that is being dampened.

Related Commands

Command

Description

bgp dampening

Enables BGP route dampening or changes various BGP route dampening factors.

clear bgp ipv6 dampening

Clears IPv6 BGP route dampening information and unsuppresses the suppressed routes.

show bgp ipv6 filter-list

To display routes that conform to a specified IPv6 filter list, use the show bgp ipv6 filter-list command in user EXEC or privileged EXEC mode.

show bgp ipv6 {unicast | multicast} filter-list access-list-number

Syntax Description

unicast

Specifies IPv6 unicast address prefixes.

multicast

Specifies IPv6 multicast address prefixes.

access-list-number

Number of an IPv6 autonomous system path access list. It can be a number from 1 to 199.

Command Modes


User EXEC
Privileged EXEC

Command History

Release

Modification

12.2(2)T

This command was introduced.

12.0(21)ST

This command was integrated into Cisco IOS Release 12.0(21)ST.

12.0(22)S

This command was integrated into Cisco IOS Release 12.0(22)S.

12.2(14)S

This command was integrated into Cisco IOS Release 12.2(14)S.

12.3(2)T

The unicast keyword was added.

12.0(26)S

The unicast and multicast keywords were added.

12.3(4)T

The multicast keyword was added.

12.2(28)SB

This command was integrated into Cisco IOS Release 12.2(28)SB.

12.2(25)SG

This command was integrated into Cisco IOS Release 12.2(25)SG.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

12.2(33)SXH

This command was integrated into Cisco IOS Release 12.2(33)SXH.

Usage Guidelines

The show bgp ipv6 filter-list command provides output similar to the show ip bgp filter-list command, except that it is IPv6-specific.

The unicast keyword is available in Cisco IOS Release 12.3(2)T and later releases. It is not available in releases prior to 12.3(2)T. Use of the unicast keyword is mandatory starting with Cisco IOS Release 12.3(2)T.

The multicast keyword is available in Cisco IOS Release 12.0(26)S and later releases. It is not available in releases prior to 12.0(26)S. Use of either the unicast or multicast keyword is mandatory starting with Cisco IOS Release 12.0(26)S.

Examples

The following is sample output from the show bgp ipv6 filter-list command for IPv6 autonomous system path access list number 1:


Note

The output is the same whether or not the unicast or multicast keyword is used. The unicast keyword is available in Cisco IOS Release 12.3(2)T and Cisco IOS Release 12.0(26)S and later releases, and the multicast keyword is available only in Cisco IOS Release 12.0(26)S and later releases. 


Router# show bgp ipv6 unicast filter-list 1
BGP table version is 26, local router ID is 192.168.0.2
Status codes:s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes:i - IGP, e - EGP, ? - incomplete
    Network              Next Hop                          Metric LocPrf Weight Path
*> 2001:0DB8:0:1::/64        2001:0DB8:0:4::2                        0 2 1 i
*> 2001:0DB8:0:1:1::/80      2001:0DB8:0:4::2                        0 2 1 i
*> 2001:0DB8:0:2:1::/80      2001:0DB8:0:4::2                        0 2 ?
*> 2001:0DB8:0:3::/64        2001:0DB8:0:4::2                        0 2 ?
*> 2001:0DB8:0:4::/64        ::                                        32768  ?
*                            2001:0DB8:0:4::2                        0 2 ?
*> 2001:0DB8:0:5::/64        ::                                        32768  ?
*                            2001:0DB8:0:4::2                        0 2 1 ?
*> 2001:0DB8:0:6::1/64       ::                                        32768  i
*> 2030::/64                 2001:0DB8:0:4::2                        0 1
*> 2040::/64                 2001:0DB8:0:4::2                        0 2 1 ?
*> 2050::/64                 2001:0DB8:0:4::2                        0 2 1 ?

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

Table 5. show bgp ipv6 filter-list Field Descriptions

Field

Description

BGP table version

Internal version number for the table. This number is incremented any time the table changes.

local router ID

A 32-bit number written as 4 octets separated by periods (dotted-decimal format).

Status codes

Status of the table entry. The status is displayed at the beginning of each line in the table. It can be one of the following values:

  • s--The table entry is suppressed.

  • d--The table entry is dampened.

  • h--The table entry is history.

  • *--The table entry is valid.

  • >--The table entry is the best entry to use for that network.

  • i--The table entry was learned via an internal BGP session.

Origin codes

Indicates the origin of the entry. The origin code is placed at the end of each line in the table. It can be one of the following values:

  • i--Entry originated from Interior Gateway Protocol (IGP) and was advertised with a network router configuration command.

  • e--Entry originated from Exterior Gateway Protocol (EGP).

  • ?--Origin of the path is not clear. Usually, this is a router that is redistributed into BGP from an IGP.

Network

IPv6 address of the network the entry describes.

Next Hop

IPv6 address of the next system that is used when forwarding a packet to the destination network. An entry of two colons (::) indicates that the router has some non-BGP routes to this network.

Metric

If shown, this is the value of the interautonomous system metric. This field is frequently not used.

LocPrf

Local preference value as set with the set local-preference route-map configuration command. The default value is 100.

Weight

Weight of the route as set via autonomous system filters.

Path

Autonomous system paths to the destination network. There can be one entry in this field for each autonomous system in the path. At the end of the path is the origin code for the path. It can be one of the following values:

  • i--The entry was originated with the IGP and advertised with a network router configuration command.

  • e--The route originated with EGP.

  • ?--The origin of the path is not clear. Usually this is a path that is redistributed into BGP from an IGP.

Related Commands

Command

Description

ip as-path access-list

Defines a BGP autonomous system path access list.

show bgp ipv6 flap-statistics

To display IPv6 Border Gateway Protocol (BGP) flap statistics , use the show bgp ipv6 flap-statistics command in user EXEC or privileged EXEC mode.

show bgp ipv6 { unicast | multicast} dampening flap-statistics [ regexp regular-expression | quote-regexp regular-expression | filter-list list | ipv6-prefix/prefix-length [ longer-prefix]]

Syntax Description

unicast

Specifies IPv6 unicast address prefixes.

multicast

Specifies IPv6 multicast address prefixes.

dampening

Displays detailed information about dampening.

regexp regular-expression

(Optional) Displays flap statistics for all the paths that match the regular expression.

quote-regexp regular-expression

(Optional) Displays flap statistics for all the paths that match the regular expression as a quoted string of characters.

filter-list list

(Optional) Displays flap statistics for all the paths that pass the access list.

ipv6-prefix

(Optional) Displays flap statistics for a single entry at this IPv6 network number.

/ipv6-prefix

(Optional) The length of the IPv6 prefix. A decimal value that indicates how many of the high-order contiguous bits of the address comprise the prefix (the network portion of the address). A slash mark must precede the decimal value

longer-prefix

(Optional) Displays flap statistics for more specific entries.

Command Modes

User EXEC

Privileged  EXEC

Command History

Release

Modification

12.2(2)T

This command was introduced.

12.0(21)ST

This command was integrated into Cisco IOS Release 12.0(21)ST.

12.0(22)S

This command was integrated into Cisco IOS Release 12.0(22)S.

12.2(14)S

This command was integrated into Cisco IOS Release 12.2(14)S.

12.3(2)T

The unicast and dampening keywords were added.

12.0(26)S

The unicast and multicast keywords were added.

12.3(4)T

The unicast and multicast keywords were added.

12.2(28)SB

This command was integrated into Cisco IOS Release 12.2(28)SB.

12.2(25)SG

This command was integrated into Cisco IOS Release 12.2(25)SG.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

12.2(33)SXH

This command was integrated into Cisco IOS Release 12.2(33)SXH.

Usage Guidelines

The show bgp ipv6 unicast dampening flap-statistics and show bgp ipv6 multicast dampening flap-statistics commands provide output similar to the show ip bgp flap-statistics command, except they are IPv6-specific.

If no arguments or keywords are specified, the router displays flap statistics for all routes.

The unicast keyword is available in Cisco IOS Release 12.3(2)T and later releases. It is not available in releases prior to 12.3(2)T. Use of theunicast keyword is mandatory starting with Cisco IOS Release 12.3(2)T.

The multicast keyword is available in Cisco IOS Release 12.0(26)S and later releases. It is not available in releases prior to 12.0(26)S. Use of either theunicast ormulticast keyword is mandatory starting with Cisco IOS Release 12.0(26)S.

Examples

The following is sample output from the show bgp ipv6 flap-statistic s command without arguments or keywords:


Note

The output is the same whether or not the unicast, multicast and dampening keywords are used. The unicast and dampening keywords are available only in Cisco IOS Release 12.3(2)T and Cisco IOS Release 12.0(26)S and later releases, and the multicast keyword is available only in Cisco IOS Release 12.0(26)S and later releases. 

Router# show bgp ipv6 unicast dampening flap-statistics

BGP table version is 12612, local router ID is 192.168.7.225
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
   Network          From            Flaps Duration Reuse    Path
*d 2001:200::/35    3FFE:1100:0:CC00::1 
                                    12145 10:09:15 00:57:10 1849 2914 4697 2500
*  2001:218::/35    2001:0DB8:0:F004::1    
                                    2     00:03:44          3462 4697

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

Table 6. show bgp ipv6 flap-statistics Field Descriptions

Field

Description

BGP table version

Internal version number of the table. This number is incremented whenever the table changes.

local router ID

A 32-bit number written as 4 octets separated by periods (dotted decimal format).

Status codes

Status of the table entry. The status is displayed at the beginning of each line in the table. It can be one of the following values:

  • s--The table entry is suppressed.

  • d--The table entry is dampened.

  • h--The table entry is history.

  • *--The table entry is valid.

  • >--The table entry is the best entry to use for that network.

  • i--The table entry was learned via an internal BGP session.

Origin codes

Indicates the origin of the entry. The origin code is placed at the end of each line in the table. It can be one of the following values:

  • i--Entry originated from the Interior Gateway Protocol (IGP) and was advertised with a network router configuration command.

  • e--Entry originated from the Exterior Gateway Protocol (EGP).

  • ?--Origin of the path is not clear. Usually, this is a router that is redistributed into BGP from an IGP.

Network

Route to the network indicated is dampened.

From

IPv6 address of the peer that advertised this path.

Flaps

Number of times the route has flapped.

Duration

Time (hours:minutes:seconds) since the router noticed the first flap.

Reuse

Time (in hours:minutes:seconds) after which the path will be made available.

Path

Autonomous system path of the route that is being dampened.

Related Commands

Command

Description

bgp dampening

Enables BGP route dampening or changes various BGP route dampening factors.

clear bgp ipv6 flap-statistics

Clears IPv6 BGP flap statistics.

ip as-path access-list

Defines a BGP autonomous system path access list.

show bgp ipv6 inconsistent-as

To display IPv6 Border Gateway Protocol (BGP) routes with inconsistent originating autonomous systems, use the show bgp ipv6 inconsistent-as command in user EXEC or privileged EXEC mode.

show bgp ipv6 {unicast | multicast} inconsistent-as

Syntax Description

unicast

Specifies IPv6 unicast address prefixes.

multicast

Specifies IPv6 multicast address prefixes.

Command Modes


User EXEC
Privileged EXEC

Command History

Release

Modification

12.2(2)T

This command was introduced.

12.0(21)ST

This command was integrated into Cisco IOS Release 12.0(21)ST.

12.0(22)S

This command was integrated into Cisco IOS Release 12.0(22)S.

12.2(14)S

This command was integrated into Cisco IOS Release 12.2(14)S.

12.3(2)T

The unicast keyword was added.

12.0(26)S

The unicast and multicast keywords were added.

12.3(4)T

The multicast keyword was added.

12.2(28)SB

This command was integrated into Cisco IOS Release 12.2(28)SB.

12.2(25)SG

This command was integrated into Cisco IOS Release 12.2(25)SG.

12.2(33)SRA

This command was integrated into Cisco IOS Release 12.2(33)SRA.

12.2(33)SXH

This command was integrated into Cisco IOS Release 12.2(33)SXH.

Usage Guidelines

The show bgp ipv6 unicast inconsistent-as and show bgp ipv6 multicast inconsistent-as commands provide output similar to the show ip bgp inconsistent-as command, except they are IPv6-specific.

The unicast keyword is available in Cisco IOS Release 12.3(2)T and later releases. It is not available in releases prior to 12.3(2)T. Use of the unicast keyword is mandatory starting with Cisco IOS Release 12.3(2)T.

The multicast keyword is available in Cisco IOS Release 12.0(26)S and later releases. It is not available in releases prior to 12.0(26)S. Use of either the unicast or multicast keyword is mandatory starting with Cisco IOS Release 12.0(26)S.

Examples

The following is sample output from the show bgp ipv6 inconsistent-as command:


Note

The output is the same whether or not the unicast or multicast keyword is used. The unicast keyword is available in Cisco IOS Release 12.3(2)T and Cisco IOS Release 12.0(26)S and later releases, and the multicast keyword is available only in Cisco IOS Release 12.0(26)S and later releases. 


Router# show bgp ipv6 unicast inconsistent-as
BGP table version is 12612, local router ID is 192.168.7.225
Status codes: s suppressed, d damped, h history, * valid, > best, i - internal
Origin codes: i - IGP, e - EGP, ? - incomplete
   Network          Next Hop            Metric LocPrf Weight Path
*  3FFE:1300::/24   2001:0DB8:0:F004::1                    0 3320 293 6175 ?
*                   3FFE:C00:E:9::2                        0 1251 4270 10318 ?
*                   3FFE:3600::A                           0 3462 6175 ?
*                   3FFE:700:20:1::11                      0 293 6175 ?

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

Table 7. show bgp ipv6 inconsistent-as Field Descriptions

Field

Description

BGP table version

Internal version number of the table. This number is incremented whenever the table changes.

local router ID

A 32-bit number written as 4 octets separated by periods (dotted decimal format).

Status codes

Status of the table entry. The status is displayed at the beginning of each line in the table. It can be one of the following values:

  • s--The table entry is suppressed.

  • d--The table entry is dampened.

  • h--The table entry is history.

  • *--The table entry is valid.

  • >--The table entry is the best entry to use for that network.

  • i--The table entry was learned via an internal BGP session.

Origin codes

Indicates the origin of the entry. The origin code is placed at the end of each line in the table. It can be one of the following values:

  • i--Entry originated from the Interior Gateway Protocol (IGP) and was advertised with a network router configuration command.

  • e--Entry originated from the Exterior Gateway Protocol (EGP).

  • ?--Origin of the path is not clear. Usually, this is a router that is redistributed into BGP from an IGP.

Network

IPv6 address of the network the entry describes.

Next Hop

IPv6 address of the next system that is used when forwarding a packet to the destination network. An entry of two colons (::) indicates that the router has some non-BGP routes to this network.

Metric

The value of the interautonomous system metric. This field is frequently not used.

LocPrf

Local preference value as set with the set local-preference route-map configuration command. The default value is 100.

Weight

Weight of the route as set via autonomous system filters.

Path

Autonomous system paths to the destination network. There can be one entry in this field for each autonomous system in the path.

show bgp ipv6 labels

To display the status of all IPv6 Border Gateway Protocol (BGP) connections, use the show bgp ipv6 labels command in user EXEC or privileged EXEC mode.

show bgp ipv6 {unicast | multicast} labels

Syntax Description

unicast

Specifies IPv6 unicast address prefixes.

multicast

Specifies IPv6 multicast address prefixes.

Command Modes


User EXEC
Privileged EXEC

Command History

Release

Modification

12.3(2)T

This command was introduced.

12.0(26)S

The unicast and multicast keywords were added.

12.3(4)T

The unicast and multicast keywords were added.

Usage Guidelines

The multicast keyword is available in Cisco IOS Release 12.0(26)S and later releases. It is not available in releases prior to 12.0(26)S. Use of either the unicast or multicast keyword is mandatory starting with Cisco IOS Release 12.0(26)S.

Examples

The following is sample output from the show bgp ipv6 labels command:


Note

The output is the same whether or not the unicast or multicast keyword is used. The unicast keyword is available in Cisco IOS Release 12.3(2)T and Cisco IOS Release 12.0(26)S and later releases, and the multicast keyword is available only in Cisco IOS Release 12.0(26)S and later releases. 


Router# show bgp ipv6 unicast labels
Network                     Next Hop        In label/Out label
2001:1:101::1/128           ::FFFF:172.17.1.1  nolabel/19
2001:3:101::1/128           ::FFFF:172.25.8.8  nolabel/19

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

Table 8. show bgp ipv6 labels Field Descriptions

Field

Description

Network

IPv6 address of the network the entry describes.

Next Hop

IPv6 address of the next system that is used when forwarding a packet to the destination network. An entry of two colons (::) indicates that the router has some non-BGP routes to this network.

In label/Out label

IPv6 BGP connections.