IPv6

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IPv6 for Cisco IOS Software, File 3 of 3: CommandsThis document contains new and revised commands for the Cisco implementation of IP version 6 (IPv6) in the Cisco IOS software. All other commands used with IPv6 are documented in the Cisco IOS Release 12.2 command reference publications. The following sections are included in this document:

Documentation Specifics, page 1 New and Revised Commands, page 2

Documentation SpecificsIPv6 features are supported only in the 12.2 T Cisco IOS software release train, starting at Cisco IOS Release 12.2(2)T. Subsequent releases of the 12.2 T Cisco IOS software train will support additional IPv6 features. This document along with the following IPv6 for Cisco IOS Software feature documentation in the New Features in Release 12.2 T area of Cisco.com will be updated with information about additional IPv6 features at each subsequent release of the 12.2 T Cisco IOS software release train:

Start Here: Cisco IOS Software Release Specifics for IPv6 Features IPv6 for Cisco IOS Software, File 1 of 3: Overview IPv6 for Cisco IOS Software, File 2 of 3: Configuring IPv6 for Cisco IOS Software, File 3 of 3: Commands (This document)

Note

The Start Here: Cisco IOS Software Release Specifics for IPv6 Features document details which IPv6 features are supported in each release of the 12.2 T Cisco IOS software train. Not all IPv6 features may be supported in your Cisco IOS software release. We strongly recommend that you read the entire Start Here: Cisco IOS Software Release Specifics for IPv6 Features document before reading the other IPv6 for Cisco IOS Software feature documentation. The other IPv6 for Cisco IOS Software feature documentation provides IPv6 overview, configuration, and command reference information for IPv6 features in each release of the 12.2 T Cisco IOS software train.

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IPv6 for Cisco IOS Software, File 3 of 3: Commands New and Revised Commands

New and Revised CommandsNote

The following list of new and revised commands for the Cisco implementation of IPv6 in the Cisco IOS software is not inclusive. Some commands that have been modified to support the ipv6-address argument are not included in the following list. To determine if a command that is not in the following list supports the ipv6-address argument, use the question mark (?) online help function.

address-family ipv6, page 5 clear bgp ipv6, page 7 clear bgp ipv6 dampening, page 9 clear bgp ipv6 external, page 10 clear bgp ipv6 flap-statistics, page 11 clear ipv6 neighbors, page 13 clear ipv6 prefix-list, page 14 clear ipv6 route, page 16 clear ipv6 traffic, page 17 copy, page 19 debug bgp ipv6 dampening, page 34 debug bgp ipv6 updates, page 36 debug ipv6 icmp, page 38 debug ipv6 nd, page 41 debug ipv6 packet, page 44 debug ipv6 rip, page 47 debug ipv6 routing, page 50 dialer-list protocol, page 52 ip name-server, page 55 ipv6 access-class, page 56 ipv6 access-list, page 57 ipv6 address, page 59 ipv6 address eui-64, page 61 ipv6 atm-vc, page 63 ipv6 enable, page 65 ipv6 hop-limit, page 66 ipv6 host, page 67 ipv6 icmp error-interval, page 68 ipv6 mtu, page 69 ipv6 nd dad attempts, page 70

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IPv6 for Cisco IOS Software, File 3 of 3: Commands New and Revised Commands

ipv6 nd managed-config-flag, page 73 ipv6 nd ns-interval, page 74 ipv6 nd other-config-flag, page 75 ipv6 nd prefix-advertisement, page 76 ipv6 nd ra-interval, page 78 ipv6 nd ra-lifetime, page 79 ipv6 nd reachable-time, page 80 ipv6 nd suppress-ra, page 81 ipv6 prefix-list, page 82 ipv6 redirects, page 85 ipv6 rip default-information, page 87 ipv6 rip enable, page 88 ipv6 rip metric-offset, page 89 ipv6 rip summary-address, page 90 ipv6 route, page 92 ipv6 router rip, page 94 ipv6 traffic-filter, page 95 ipv6 unicast-routing, page 96 ipv6 unnumbered, page 97 match ipv6 address, page 99 match ipv6 next-hop, page 101 match ipv6 route-source, page 103 neighbor activate, page 105 neighbor override-capability-neg, page 107 neighbor update-source, page 109 ping, page 111 poison-reverse (IPv6 RIP), page 115 port (IPv6 RIP), page 116 redistribute (IPv6 RIP), page 117 set ipv6 next-hop (BGP), page 119 show bgp ipv6, page 121 show bgp ipv6 community, page 124 show bgp ipv6 community-list, page 127 show bgp ipv6 dampened-paths, page 129 show bgp ipv6 filter-list, page 131 show bgp ipv6 flap-statistics, page 134 show bgp ipv6 inconsistent-as, page 137 show bgp ipv6 neighbors, page 139

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IPv6 for Cisco IOS Software, File 3 of 3: Commands New and Revised Commands

show bgp ipv6 paths, page 147 show bgp ipv6 quote-regexp, page 149 show bgp ipv6 regexp, page 151 show bgp ipv6 summary, page 153 show ip sockets, page 155 show ipv6 access-list, page 157 show ipv6 interface, page 159 show ipv6 mtu, page 163 show ipv6 neighbors, page 164 show ipv6 prefix-list, page 166 show ipv6 rip, page 169 show ipv6 route, page 171 show ipv6 route summary, page 174 show ipv6 routers, page 175 show ipv6 traffic, page 178 show ipv6 tunnel, page 180 split-horizon (IPv6 RIP), page 182 telnet, page 183 timers (IPv6 RIP), page 188 traceroute, page 190 tunnel mode ipv6ip, page 196

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IPv6 for Cisco IOS Software, File 3 of 3: Commands address-family ipv6

address-family ipv6To enter address family configuration mode for configuring routing sessions such as Border Gateway Protocol (BGP) that use standard IPv6 address prefixes, use the address-family ipv6 command in router configuration mode. To disable address family configuration mode, use the no form of this command. address-family ipv6 [unicast] no address-family ipv6 [unicast]

Syntax Description

unicast

(Optional) Specifies IPv6 unicast address prefixes.

Defaults

IPv6 address prefixes are not enabled. Unicast address prefixes are the default when IPv6 address prefixes are configured.

Note

Routing information for address family IPv4 is advertised by default for each BGP routing session configured with the neighbor remote-as command unless you configure the no bgp default ipv4-unicast command before configuring the neighbor remote-as command.

Command Modes

Router configuration

Command History

Release 12.2(2)T

Modification This command was introduced.

Usage Guidelines

The address-family ipv6 command places the router in address family configuration mode (prompt: config-router-af), from which you can configure routing sessions that use standard IPv6 address prefixes. To leave address family configuration mode and return to router configuration mode, enter the exit-address-family command. Within address family configuration mode, use the question mark (?) online help function to display supported commands. The BGP commands supported in address family configuration mode configure the same functionality as the BGP commands supported in router configuration mode; however, the BGP commands in router configuration mode configure functionality only for the IPv4 unicast address prefix. To configure BGP commands and functionality for other address family prefixes (for example, the IPv4 multicast or IPv6 unicast address prefixes), you must enter address family configuration mode for those address prefixes using the address-family ipv4 command or the address-family ipv6 command.

Examples

The following example places the router in address family configuration mode and specifies unicast address prefixes for the IPv6 address family:Router(config)# router bgp 100 Router(config-router)# address-family ipv6 unicast Router(config-router-af)#

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IPv6 for Cisco IOS Software, File 3 of 3: Commands address-family ipv6

Related Commands

Command address-family ipv4 address-family vpnv4 bgp default ipv4-unicast neighbor activate

Description Places the router in address family configuration mode for configuring routing sessions, such as BGP, that use standard IPv4 address prefixes. Places the router in address family configuration mode for configuring routing sessions, such as BGP, that use standard VPNv4 address prefixes. Enables the IPv4 unicast address family on all neighbors. Enables the exchange of information with a BGP neighboring router.

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IPv6 for Cisco IOS Software, File 3 of 3: Commands clear bgp ipv6

clear bgp ipv6To reset IPv6 Border Gateway Protocol (BGP) sessions, use the clear bgp ipv6 command in privileged EXEC mode at the system prompt. clear bgp ipv6 {* | autonomous-system-number | ip-address | ipv6-address | peer-group-name} [soft] [in | out]

Syntax Description

* autonomous-system-number ip-address ipv6-address

Resets all current BGP sessions. Resets BGP sessions for BGP neighbors within the specified autonomous system. Resets the TCP connection to the specified IPv4 BGP neighbor and removes all routes learned from the connection from the BGP table. Resets the TCP connection to the specified IPv6 BGP neighbor and removes all routes learned from the connection from the BGP 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.

peer-group-name soft in | out

Resets the TCP connection to the specified IPv6 BGP neighbor and removes all routes learned from the connection from the BGP table. (Optional) Soft reset. Does not reset the session. (Optional) Triggers inbound or outbound soft reconfiguration. If the in or out option is not specified, both inbound and outbound soft resets are triggered.

Defaults

No reset is initiated.

Command Modes

Privileged EXEC

Command History

Release 12.2(2)T

Modification This command was introduced.

Usage Guidelines

The clear bgp ipv6 command is similar to the clear

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