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Community Member

RRs in Same Cluster Without Cluster-ID configure

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.

RR1-172.18.255.254

RR2-172.18.255.253

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

BGP using 235494 total bytes of memory

BGP activity 1756/878 prefixes, 2534/1267 paths, scan interval 15 secs

Neighbor V AS MsgRcvd MsgSent TblVer InQ OutQ Up/Down State/PfxRcd

172.18.255.1 4 10081 338 686 879 0 0 00:32:04 502

172.18.255.2 4 10081 349 687 879 0 0 00:32:04 511

.....

....

..

172.18.255.253 4 10081 80 522 0 0 90 00:00:06 0

show log

----------

Nov 6 03:04:19 MYT: %BGP-5-ADJCHANGE: neighbor 172.18.255.254 Up

Nov 6 03:07:20 MYT: %BGP-5-ADJCHANGE: neighbor 172.18.255.254 Down BGP Notification sent

Nov 6 03:07:20 MYT: %BGP-3-NOTIFICATION: sent to neighbor 172.18.255.254 4/0 (hold time expired) 0

bytes

Nov 6 03:08:04 MYT: %BGP-5-ADJCHANGE: neighbor 172.18.255.254 Up

Nov 6 03:11:04 MYT: %BGP-5-ADJCHANGE: neighbor 172.18.255.254 Down BGP Notification sent

Nov 6 03:11:04 MYT: %BGP-3-NOTIFICATION: sent to neighbor 172.18.255.254 4/0 (hold time expired) 0

bytes

Nov 6 03:11:45 MYT: %BGP-5-ADJCHANGE: neighbor 172.18.255.254 Up

Nov 6 03:14:46 MYT: %BGP-5-ADJCHANGE: neighbor 172.18.255.254 Down BGP Notification sent

Nov 6 03:14:46 MYT: %BGP-3-NOTIFICATION: sent to neighbor 172.18.255.254 4/0 (hold time expired) 0

bytes

Nov 6 03:15:27 MYT: %BGP-5-ADJCHANGE: neighbor 172.18.255.254 Up

Nov 6 03:18:27 MYT: %BGP-5-ADJCHANGE: neighbor 172.18.255.254 Down BGP Notification sent

Nov 6 03:18:27 MYT: %BGP-3-NOTIFICATION: sent to neighbor 172.18.255.254 4/0 (hold time expired) 0

RR1

---

router bgp 10081

bgp router-id 172.18.255.254

no bgp default ipv4-unicast

bgp log-neighbor-changes

bgp graceful-restart restart-time 120

bgp graceful-restart stalepath-time 360

bgp graceful-restart

neighbor VPN-RR-CLIENT peer-group

neighbor VPN-RR-CLIENT remote-as 10081

neighbor VPN-RR-CLIENT password 7 xxx

neighbor VPN-RR-CLIENT update-source Loopback0

neighbor VPN-RR peer-group

neighbor VPN-RR remote-as 10081

neighbor VPN-RR password 7 xxx

neighbor VPN-RR update-source Loopback0

neighbor 172.18.255.1 peer-group VPN-RR-CLIENT

neighbor 172.18.255.2 peer-group VPN-RR-CLIENT

neighbor 172.18.255.253 peer-group VPN-RR

address-family vpnv4

neighbor VPN-RR-CLIENT send-community both

neighbor VPN-RR-CLIENT route-reflector-client

neighbor VPN-RR send-community both

neighbor 172.18.255.1 activate

neighbor 172.18.255.2 activate

neighbor 172.18.255.253 activate

exit-address-family

2 REPLIES
Community Member

Re: RRs in Same Cluster Without Cluster-ID configure

RR2 config below

RR2

-----

router bgp 10081

bgp router-id 172.18.255.253

no bgp default ipv4-unicast

bgp log-neighbor-changes

bgp graceful-restart restart-time 120

bgp graceful-restart stalepath-time 360

bgp graceful-restart

neighbor VPN-RR-CLIENT peer-group

neighbor VPN-RR-CLIENT remote-as 10081

neighbor VPN-RR-CLIENT password 7 xxx

neighbor VPN-RR-CLIENT update-source Loopback0

neighbor VPN-RR peer-group

neighbor VPN-RR remote-as 10081

neighbor VPN-RR password 7 xxx

neighbor VPN-RR update-source Loopback0

neighbor 172.18.255.1 peer-group VPN-RR-CLIENT

neighbor 172.18.255.2 peer-group VPN-RR-CLIENT

neighbor 172.18.255.254 peer-group VPN-RR

!

address-family vpnv4

neighbor VPN-RR-CLIENT send-community both

neighbor VPN-RR-CLIENT route-reflector-client

neighbor VPN-RR send-community both

neighbor 172.18.255.1 activate

neighbor 172.18.255.2 activate

neighbor 172.18.255.254 activate

exit-address-family

Community Member

Re: RRs in Same Cluster Without Cluster-ID configure

Hi all,

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.

Regards

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