10-14-2004 06:42 AM - edited 03-02-2019 07:16 PM
Hello,
Our internal routes flushed out of routing table time to time for some season. Could anyone please shed a light to this problem?
We have four routers. Router1, router2 and router3 are fully meshed. Router3 and router4 are route reflectors as shown on diagram below.
Router1-------Router2
- -
- -
Router3(RR)-------------Router4(RR)
We are running iBGP with all routers, and below is what we are seeing from router4,
ala-oc12-rtr#sh ip route 192.168.32.1
Routing entry for 192.168.32.0/19, supernet
Known via "bgp 66055", distance 200, metric 0, type internal
Last update from 10.125.28.1 00:00:31 ago
Routing Descriptor Blocks:
* 10.125.28.1, from 10.125.28.101, 00:00:31 ago
Route metric is 0, traffic share count is 1
AS Hops 0
ala-oc12-rtr#sh ip bgp 192.168.32.1
BGP routing table entry for 192.168.32.0/19, version 1214376
Paths: (1 available, best #1, table Default-IP-Routing-Table)
Flag: 0x208
Advertised to non peer-group peers:
10.123.21.193
Local
10.125.28.1 from 10.125.28.101 (64.176.100.50)
Origin IGP, metric 0, localpref 100, valid, internal, best
Originator: 64.176.100.50, Cluster list: 64.176.100.50
ala-oc12-rtr#sho ip route 192.168.32.1
% Network not in table
ala-oc12-rtr#sho ip bgp 192.168.32.1
BGP routing table entry for 0.0.0.0/0, version 874889
Paths: (1 available, best #1, table Default-IP-Routing-Table)
Not advertised to any peer
209
10.123.21.193 from 10.123.21.193 (205.171.3.201)
Origin IGP, metric 0, localpref 100, valid, external, best
Thank you in advance....
10-14-2004 02:28 PM
192.168.32.0/19 is definitely flapping. It could be due to the BGP session flapping or the originator advertising and withdrawing the prefix.
Is the bgp session itself stable? Could you provide a "sh ip bgp 10.125.28.101". Just curious, is this real output from the RR "Known via "bgp 66055"" ;o)
Thanks,
10-15-2004 10:51 AM
Hi,
Thanks for replay.
I was missing static route pointing next hop, and it is fixed now.
Thanks again.
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