Configuring IPv6 with Cisco IOS
Evaluates the IPv6 architecture and elements, troubleshooting, screening, security and more.
TABLE OF CONTENTS Configuring IPv6 with Cisco IOS
Configuring BGP Extensions for IPv6
As with IS-IS, a new version of BGP was not developed specifically for the purpose of routing IPv6; rather, new multi-protocol extensions were added to the protocol to support IPv6. Enhancements made to the protocol include the support for IPv6, support for IPv6 next hop addressing information, and support for link-local IPv6 addressing.
As we discussed before, a new version of BGP was not created for IPv6, so you enter into IPv6 BGP configuration the same way that you did IPv4 configuration: through the use of the router bgp < as number> command. Upon entering the BGP configuration mode, you then need to enter the no bgp default ipv4-unicast command. This command turns off IPv4 BGP unicasts. This is a necessary step because, by default, IPv4 address information is advertised for each BGP neighbor configured on the router. IPv6 cannot work if this is taking place.
Configuring an IPv6 Neighbor Relationship
It is slightly more involved to set up IPv6 neighbor relationships than IPv4 neighbors. To set up an IPv6 neighbor in BGP, you must first specify the IPv6 address and remote-as number of the neighbor router by using the neighbor < ipv6 address> remote-as < as number> command. Follow this command set by entering into IPv6 address family configuration and activation of the neighbor. You do this with the ipv6 address-family command, followed by the neighbor < ipv6 address> activate command. The networks that you...
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