[c-nsp] c12000 BGP problems

[Primoz Jeroncic]

Hi everyone

I'm getting some strange problems with our c12008 and BGP running on it. We
are using those routers on few locations and I don't have any problems
with any of them except with one, which we are using at DECIX (IX in Frankfurt
Germany). All BGP peers (around 90) are working fine except BGP peers
with DECIX route servers. As soon as I configure BGP with 2 route
servers utilization goes to 80 or 90% and I'm getting following errors:

Feb 11 08:57:25: BGP: 80.81.192.157 Bad attributes FFFF FFFF FFFF FFFF FFFF FFFF FFFF FFFF 005C 0200 0000 2740 0101 0040 0206 0202 201C 0761 4003 0450 51C1 3D80 0404 0000 0005 4006 00C0 0706 0761 1023 F322 140F C3B0 13C0 AA60 18C0 064C 18C0 0640 109B D00F 100E 110F C600 120F C5C0

No manual session reset help, and no matter what I do session is just
flapping.

As far as I found out till now, this was bug which was fixed in 12.1T
(12.2 mainline). But problem is that this is not IOS for our boxes.
Right now we are running GSR-120.26S5 (newer version doesn't work
on our config (GRP-B, 2x LC-4OC3/POS-SM, 2x 8FE-TX-RJ45-B). Besides
that there's no 12.1 or 12.2 version of gsr ios anyway.

I would appreciate any help. So if someone has some ideas how to fix
this I would appreciate it.

PS: Before we had this thing running on c7401 and it was working fine,
except that router was a bit overhelmed with traffic :)

Regards,
Primoz Jeroncic
Support - IP Connectivity & Routing
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