12-19-2007 10:50 AM - edited 03-03-2019 08:00 PM
we have an issue where I can see BGP prefixes in the BGP-RIB table. The prefix is coming up as 'no best path'. The routers that are advertising the routes are reachable and sync is turned off. Why can't I see the routing in the routing table?
12-19-2007 12:19 PM
Can you send Show ip bgp for such prefix.
12-19-2007 12:25 PM
This seems to be an issue for any networks on the 64622 AS. All other AS's are fine...
BGP routing table entry for 10.237.0.0/16, version 10082
Paths: (2 available, no best path)
Multipath: eBGP iBGP
Flag: 0x820
Not advertised to any peer
64622, (received & used)
10.250.92.9 from 10.250.92.9 (10.254.100.92)
Origin IGP, metric 4294967295, localpref 100, valid, internal
64622, (received & used)
10.250.92.10 from 10.250.92.10 (10.254.100.192)
Origin IGP, metric 4294967295, localpref 100, valid, internal
12-19-2007 12:32 PM
This is only can happen when syn is on (which is not your case because there is no sync warning in the output) or when there already route with better AD installed in the routing table, nothing can prevent one AS from install the routes in the routing table (expect memory issues)
can we share the config, i will lab it up on my Rack for you.
12-19-2007 12:41 PM
Marc
You say that The routers that are advertising the routes are reachable. I am not clear whether than means that the advertised next hop is reachable or just that the router peer address is reachable. If the router is reachable but the next hop address is not reachable you would get symptoms like what you are experiencing.
Can you clarify whether the next hop address is reachable?
HTH
Rick
12-19-2007 06:04 PM
Hi,
Does your BGP configured for MPLS VPN multipath load sharing? It looks like it as indicated by the following;
Multipath: eBGP iBGP
Flag: 0x820
I think you should have external route and that should be the best path.
What is your "maximum-paths eibgp" value?
Regards,
Dandy
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