[c-nsp] slow convergence for full bgp table on a Cisco 7613/SUP720-3BXL

[Saku Ytti]

On (2007-03-13 15:50 +0200), Emanuel Popa wrote:
 
> we had 2 x GE links with our upstream and one BGP session with full
> routing table on the loopback interfaces. everything was fine until we
> needed an upgrade. so we upgraded from 2 x GE to 1 x 10GE. our biggest
> issue is that our router needs around two hours to receive the full
> bgp table over the new session. the old session takes a maximum of
> five minutes to converge. the only difference is that one session ends
> on a 6724-SFP linecard and the other session ends on a 6704-10GE
> linecard. both of them have DFCs.

Do you have input queue drops:
LAB-P1#sh int giga1/1 | i Input
  Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 0

If so, increase it, I can't think of any issue increasing it to maximum,
but perhaps 1000 for a start.

btw. takes around minute for me, which is way too much and Cisco opened
case because they couldn't immediately explain what is capping the
convergency, CSCsh81034.

You might also want to run PMTUD, but lack of it, can't cause
issues this severe.

-- 
  ++ytti