I had 2 RRs in the same cluster running for sometime without any problems until I shutdown one of the RR router (RR1) and move it to new location. After power up again, I have this problem where the iBGP session between RRs keep on change state from up/down every 2-3 minutes. RR clients session to RRs no problem at all.
- does it caused by no cluster-id configured ?
- after session up, I can see OutQ=90 on show ip bgp summ.
RR1#sh ip bgp vpnv4 all summ
BGP router identifier 172.18.255.254, local AS number 10081
BGP table version is 879, main routing table version 879
878 network entries using 120286 bytes of memory
1267 path entries using 86156 bytes of memory
221/158 BGP path/bestpath attribute entries using 27404 bytes of memory
8 BGP AS-PATH entries using 192 bytes of memory
50 BGP extended community entries using 1456 bytes of memory
0 BGP route-map cache entries using 0 bytes of memory
0 BGP filter-list cache entries using 0 bytes of memory
Re: RRs in Same Cluster Without Cluster-ID configure
Managed to get problem solved.
When RR1 established TCP session to another RR2 or vice versa. The Datagrams max data segment is 1540 bytes (at the end of show ip bgp neighbors x.x.x.x) But RRs established to other clients, it was 1516 bytes in size. I am not sure why.
There is another message appear during " show ip bgp neighbors RR2 ip"
[Keepalives are temporarily in throttle due to TCP]
After I configured the global command " ip tcp mss 1516 " on both RR1 and RR2 , problem resolved and show ip bgp neighbors RR2 ip this time it shown the The Datagrams max data segment is 1516 bytes.
And the message [Keepalives are temporarily in throttle due to TCP] dissapeared.
All working fine now the peering between RRs no longer flapping,it now stable and working fine.
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