[c-nsp] 7606 to 6509 [BGP hold time issue]

[Scantlebury, Kieron]

FYI to all involved. This has been resolved. Moved physical cabling to a new port on our ASR and like magic. Sorted.


From: Shanawaz Batcha [mailto:ismath.shaan at gmail.com]
Sent: 08 May 2012 13:15
To: Scantlebury, Kieron
Cc: cisco-nsp at puck.nether.net
Subject: Re: [c-nsp] 7606 to 6509 [BGP hold time issue]

Now that you are confident you have tried a lower MTU setting satisfactorily, just revisiting a couple of points mentioned by others (at the cost of sounding repetitive but always good to check)

1. Is BGP MSS or PMTUD explicitly set on either side? have you tried disabling them
2. Is BGP max prefix set on the other side ?


On Tue, May 8, 2012 at 7:59 PM, Scantlebury, Kieron <Kieron.Scantlebury at level3.com<mailto:Kieron.Scantlebury at level3.com>> wrote:

MTU's been checked and confirmed on numerous occasions with the customer. Their control plane has no policing.

FYI. He has numerous other connections to the same device all receiving a full routing table and they all work fine. Its just our connection that's having the issue.

Its driving me round the bend :)

Cheers
Kieron

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net<mailto:cisco-nsp-bounces at puck.nether.net> [mailto:cisco-nsp-bounces at puck.nether.net<mailto:cisco-nsp-bounces at puck.nether.net>] On Behalf Of Shanawaz Batcha
Sent: 04 May 2012 23:14
To: cisco-nsp at puck.nether.net<mailto:cisco-nsp at puck.nether.net>
Subject: [c-nsp] 7606 to 6509 [BGP hold time issue]

During the 3 minutes of the session holding up, do you see any packets in the OutQ (show ip bgp summ)

Neighbor        V           AS MsgRcvd MsgSent   TblVer  InQ OutQ Up/Down
State/PfxRcd
172.16.2.1     4       64900 1754971 1714093  1406547    0    0
7w2d            8

As has been fairly pointed out, it looks like your 'fat' update packets are likely dropped by either an MTU mismatch or a CoPP filter on the other side. Its hard to know either way without further debugging (debug ip bgp
update) run during your off-hours

Shaan
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