bfd & IPv6 on Cisco 4948E-E / IOS 15.2

Wed Jun 7 18:25:20 UTC 2023

On 07/06/2023 04:13, Jason Canady wrote:
> 
> Using this on the interface of each switch:
> 
>   ospfv3 1 bfd
>   ospfv3 1 ipv6 area 0
>   ospfv3 1 ipv6 bfd
>   bfd interval 500 min_rx 500 multiplier 40
> 
> #show bfd neighbors details
> IPv6 Sessions
> NeighAddr                              LD/RD         RH/RS State     Int
> FE80::A2EC:F9FF:FE2B:B33F              68/0          Down Down      Te1/52
> Session Host: Software
> OurAddr: FE80::BA38:61FF:FE65:20BF

There's literally one command here in the docs, and it doesn't look like 
you're using it. You are using one that isn't documented, too. Woo!

https://www.cisco.com/c/en/us/td/docs/ios-xml/ios/iproute_ospf/configuration/15-e/iro-15-e-book/ip6-route-ospfv3.html

I'd suggest taking the 'ospfv3 1 ipv6 bfd' command out and seeing if 
that still gives you an IPv6 session attempt? If in doubt, add the 'all- 
interfaces' to 'ospfv3 1 bfd' & look again.

Old IOS and old hardware. Great gear at the time, but I can't imagine 
anyone at Cisco will be interested in fixing it if it's not quite 
working right.

The only other thing I've be interested to know is if you can specify a 
pair of static link-local neighbour addresses under 'ospfv3 1 ipv6 bfd 
...'?  Something like fe80::1 and fe80::2? As opposed to relying on 
autoconf addresses.

-- 
Tom