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

Fri Jun 9 17:11:48 UTC 2023

Hi Tom,

Thank you!   None of this is working and unless I've missed something, 
it doesn't seem to be supported.  I tried downgrading to 15.0 and it 
didn't even have bfd support for anything at all.

I may just have to go without bfd for IPv6 and turn the timers down on 
OSPFv3.  I'm open to any further suggestions or thoughts!

Best Regards,

Jason

On 6/7/23 2:25 PM, Tom Hill wrote:
> 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.
>