From: Jeff Nelson (jnelson@rackspace.com)
Date: Mon Dec 29 2003 - 13:45:10 GMT-3
BGP/OSPF router-id mismatch it was.
I guess I will just make this standard practice for my configs. Thank you, it was confusing me.
--jeff
Marvin Greenlee(marvingreenlee@yahoo.com)@03/12/28 23:54:
> Many OSPF/BGP RR issues can be caused by one of the
> following:
> Mismatched OSPF & BGP Router IDs
> Missing 'next-hop' statement
>
> Does R4 have a route for 172.16.123.1?
> Do OSPF/BGP router IDs match?
>
> Sincerely,
> Marvin Greenlee
>
> --- Jeff Nelson <jnelson@rackspace.com> wrote:
> > I've been going throught the netmaster sample and I
> > came across an issue with the route reflection of
> > R3.
> > It short, it does seem to be passing along the
> > 192.168 routes to R4.
> >
> > no sync is configured on R4 (it is receiveing the
> > 3.0.0.0 route, but I can see from a show blahblah
> > advertised routes that R3 is not re-advertising the
> > 192.168 range)
> >
> > bgp is being redistributed into OSPF on R2
> >
> > There does not seem to be a valid reason, but I'm
> > sure I'm missing ?something? No time to waste time,
> > but this kind of stuff should be cake.
> >
> > Here is the bgp configs from each router:
> > r4:
> > router bgp 64600
> > no synchronization
> > bgp log-neighbor-changes
> > neighbor 172.16.34.3 remote-as 64600
> >
> > r3:
> > router bgp 64600
> > bgp log-neighbor-changes
> > network 3.0.0.0
> > neighbor 172.16.34.4 remote-as 64600
> > neighbor 172.16.34.4 route-reflector-client
> > neighbor 172.16.123.2 remote-as 64600
> > neighbor 172.16.123.2 route-reflector-client
> >
> > r2:
> > router bgp 64600
> > bgp log-neighbor-changes
> > neighbor 172.16.123.1 remote-as 100
> > neighbor 172.16.123.3 remote-as 64600
> >
> > r1
> > router bgp 100
> > no synchronization
> > bgp log-neighbor-changes
> > aggregate-address 192.168.100.0 255.255.252.0
> > as-set summary-only
> > neighbor 172.16.17.7 remote-as 700
> > neighbor 172.16.17.7 remove-private-AS
> > neighbor 172.16.123.2 remote-as 64600
> > no auto-summary
> >
> > This is the routing table on R3:
> > O E2 192.168.104.0/24 [110/1] via 172.16.123.1,
> > 00:06:27, Serial0/1
> > 3.0.0.0/24 is subnetted, 1 subnets
> > C 3.3.3.0 is directly connected, Loopback31
> > O E2 192.168.105.0/24 [110/1] via 172.16.123.1,
> > 00:06:27, Serial0/1
> > 172.16.0.0/16 is variably subnetted, 12
> > subnets, 4 masks
> > O IA 172.16.50.0/24 [110/129] via 172.16.123.2,
> > 00:06:27, Serial0/1
> > D EX 172.16.40.0/23 [170/156160] via 172.16.34.4,
> > 02:29:34, FastEthernet0/0
> > C 172.16.34.0/24 is directly connected,
> > FastEthernet0/0
> > C 172.16.28.0/22 is directly connected,
> > Loopback30
> > O IA 172.16.25.0/24 [110/128] via 172.16.123.2,
> > 00:06:28, Serial0/1
> > O IA 172.16.20.0/24 [110/65] via 172.16.123.2,
> > 00:06:28, Serial0/1
> > O E2 172.16.17.0/24 [110/100] via 172.16.123.1,
> > 00:06:28, Serial0/1
> > O E2 172.16.2.0/24 [110/20] via 172.16.123.2,
> > 00:06:28, Serial0/1
> > C 172.16.123.0/24 is directly connected,
> > Serial0/1
> > O E2 172.16.88.0/24 [110/100] via 172.16.123.1,
> > 00:06:28, Serial0/1
> > O E2 172.16.80.0/27 [110/100] via 172.16.123.1,
> > 00:06:28, Serial0/1
> > O E2 172.16.77.0/24 [110/100] via 172.16.123.1,
> > 00:06:28, Serial0/1
> > O*E2 0.0.0.0/0 [110/1] via 172.16.123.2, 00:06:28,
> > Serial0/1
> > O E2 192.168.100.0/22 [110/1] via 172.16.123.1,
> > 00:06:28, Serial0/1
> >
> > Here is the bgp table from R3 (note type is IGP and
> > not incomplete because I was playing with how it was
> > injected to see if it would propagate--of course it
> > didn't)
> > Network Next Hop Metric
> > LocPrf Weight Path
> > *> 3.0.0.0 0.0.0.0 0
> > 32768 i
> > * i192.168.100.0/22 172.16.123.1
> > 100 0 100 700 i
> > * i192.168.104.0 172.16.123.1
> > 100 0 100 700 i
> > * i192.168.105.0 172.16.123.1
> > 100 0 100 700 i
> >
> >
> > Would appreciate a tip from someone that's gone
> > through this scenario.
> >
> > Thanks,
> > Jeff
> >
>
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-- Jeff Nelson Rackspace Managed Hosting Office: (210) 892 4025 x1601 GnuPG KeyID: 0x7DE7C4E0 @pgp.mit.edu AS Caretaker: 10532 15395 25897 27357 30099
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