[c-nsp] Cogent IOS upgrade == BGP-3, "update malformed"

[Zoe O'Connell]

On 22/08/10 23:49, randal k wrote:
> Cogent did an IOS upgrade to our local router, and immediately after our
> peering with them started flapping wildly - gets about 10 seconds and
> ~69,000 prefixes in and resets with the following:
>
> 729078: Aug 22 16:21:39 MDT: %BGP-3-NOTIFICATION: sent to neighbor A.B.C.D
> 3/1 (update malformed) 21 bytes 31FE420C 31FE58C8 124683E8 0206CC67 00
> 729079: Aug 22 16:21:39 MDT: BGP: A.B.C.D Bad attributes FFFF FFFF FFFF FFFF
> FFFF FFFF FFFF FFFF 0060 0200 0000 4140 0101 0040 020C 0205 00AE 0CB9 235A
> 2046 5BA0 4003 0426 6532 7580 0404 0000 5DE8 C008 0800 AE52 0800 AE55 FD31
> FE42 0C31 FE58 C812 4683 E802 06CC 6700 0000 0002 1854 1608 1854 1609
>   

I've run across similar after an upgrade - from memory, "neigh x.x.x.x
dont-capability-negotiate" on the upgraded end is the fix.