[c-nsp] Backup Interface & IPv6 - why is Cisco sleeping?

[Seth Mattinen]

On 12/14/10 6:54 AM, Garry wrote:
> <rant>
> Having just installed a set of nice ASR1k boxes with rather new IOS, I
> noticed Cisco has still (after many years and many IOS releases) not
> managed to get Backup Interfaces & IPv6 to work with each other ... or
> I'm missing something ... but while IPv4 addresses on backup interfaces
> work just fine, IPv6 config will lead to the backup interface to no come
> up due to the IP address overlapping with the IP address of the primary
> interface (what a surprise - it's the BACKUP INTERFACE, for crying out
> loud ...)
> 
> With Cisco presenting themselves and their hardware oh so v6-ready
> (which they are for most parts I guess - all other features at least we
> require for production use seem perfectly fine), I'm really starting to
> wonder whether we're the only ones on this earth still using a dual
> switch config for our routers for redundancy purposes ...
> </rant>
> 

Have you tried:

ipv6 address 2001:0DB8:107:400::1/64 anycast

This will suppress duplicate address detection.

~Seth