12-06-2016 08:41 AM - edited 03-05-2019 07:37 AM
Hi guys,
Seems like there is something wrong with our BGP peering, it has lower tblver compared to other peerings established on router, and 1001 value in OutQ. There is one other BGP applied on same pyhsical interface, same MTU, same configuration. It works well, any ideas?
First one is fine, second is quite problamaticm, it flaps as well. It takes almost 2.5min to step out of openconfirm state.
Here it is:
Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd
172.16.152.81 4 xxxxx 11734 46752 374396 0 0 1w1d 4
172.16.154.81 4 xxxxx 6 57 1 0 1001 00:01:39 4
12-09-2016 08:34 AM
Hi Ugur,
It still looks to be an MTU issue. May be from configuration prospective you have kept MTU same for both BGP peering but there could be bottle necking for neighbor 172.16.154.81.
Are you able to ping this neighbor with a packet size equal to MTU and df-bit set?
Please rate if it helps.
HTH
-Amit
12-10-2016 11:24 PM
Hi Amit, thanks for your answer. We found out the reason, problem is more likely because of slot/card problem on cisco xr (neighbor). waiting for rma.
by the way, ping with df-bit and 1700b size is fine.
12-11-2016 06:18 AM
Thanks Ugur,
I still feel that BGP packets were not able to reach remote device from your device and they were stuck in Out queue. It happens normally in case of MTU issue only. But may be in your case remote device is not able to process BGP packets and due to lack of ACK, your cisco device kept them in out queue.
HTH
-Amit
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