EBGP multihop settings have nothing to do with route reflectors. EBGP
multihop just changes TTL values in the BGP packets going to an external
neighbor. That should not affect an iBGP relationship, barring a huge and
ugly IOS bug.
Jeff, make sure you configure the cluster ID prior to establishing the
neighbor relationships between the redundant reflectors in the cluster. If
that doesn't work consistently for you, be comforted in the fact that there
are many anomalies in IOS version 12.0 BGP, assuming that may be what you
are working with. It may be necessary to reload routers to get this to work.
Pamela
At 06:53 PM 1/13/01 -0500, you wrote:
>Hi, Jeff
>
>I think one thing might cause the trouble.
>
>1. "ebgp-multihop" should not be used between iBGP peers.
> Multihops between iBGP peers are always allowed.
>
>Thanks
>
>Regards,
>Jaeheon
>
>On 13 Jan 2001 17:22:02 -0500, [EMAIL PROTECTED] ("Horton, Jeff")
>wrote:
>
> >Hello all,
> >
> >I was trying to build a BGP scenario in the lab where I had two routers, R1
> >& R2 that are both route reflectors. R3, R4, and R5 are route-reflector
> >clients. R1 and R2 are both in cluster ID 100. Peer groups are set up for
> >both route reflectors and route reflector clients. The idea was that should
> >R1 or R2 fail, the routes would still be reflected to the clients. R1 and R2
> >are able to ping R3, R4, and R5 just fine.
> >
> >Loopbacks are 1.1.1.1, 2.2.2.2, 3.3.3.3, etc. On RR clients R3 , R4, and R5
> >I also have 30.30.30.3, 40.40.40.4, 50.50.50.5 that are advertised in BGP. I
> >seem to have mixed results and I am not quite sure where I have gone wrong.
> >R3 routes seem to be reflected but not R4 or R5.
> >
> >I would appreciate suggestions.
> >
> >Thanks,
> >
> >Jeff
> >
> >R1
> >router ospf 1
> > network 1.1.1.0 0.0.0.255 area 0
> > network 172.168.14.0 0.0.0.255 area 0
> > network 172.168.125.0 0.0.0.255 area 0
> >!
> >router bgp 1
> > no synchronization
> > bgp cluster-id 100
> > neighbor reflectors peer-group
> > neighbor reflectors remote-as 1
> > neighbor reflectors update-source Loopback0
> > neighbor clients peer-group
> > neighbor clients remote-as 1
> > neighbor clients ebgp-multihop 255
> > neighbor clients update-source Loopback0
> > neighbor clients route-reflector-client
> > neighbor 2.2.2.2 peer-group reflectors
> > neighbor 3.3.3.3 peer-group clients
> > neighbor 4.4.4.4 peer-group clients
> > neighbor 5.5.5.5 peer-group clients
> > no auto-summary
> >!
> >
> >R2
> >router ospf 1
> > network 2.2.2.0 0.0.0.255 area 0
> > network 172.168.125.0 0.0.0.255 area 0
> >!
> >router bgp 1
> > no synchronization
> > bgp cluster-id 100
> > neighbor clients peer-group
> > neighbor clients remote-as 1
> > neighbor clients update-source Loopback0
> > neighbor clients route-reflector-client
> > neighbor reflectors peer-group
> > neighbor reflectors remote-as 1
> > neighbor reflectors update-source Loopback0
> > neighbor 1.1.1.1 peer-group reflectors
> > neighbor 3.3.3.3 peer-group clients
> > neighbor 4.4.4.4 peer-group clients
> > neighbor 5.5.5.5 peer-group clients
> > no auto-summary
> >!
> >
> >R3
> >router ospf 1
> > network 3.3.3.0 0.0.0.255 area 0
> > network 192.168.23.0 0.0.0.255 area 0
> >!
> >router bgp 1
> > no synchronization
> > network 3.3.3.0 mask 255.255.255.0
> > network 30.30.30.0 mask 255.255.255.0
> > neighbor 1.1.1.1 remote-as 1
> > neighbor 1.1.1.1 update-source Loopback0
> > neighbor 1.1.1.1 next-hop-self
> > neighbor 2.2.2.2 remote-as 1
> > neighbor 2.2.2.2 update-source Loopback0
> > neighbor 2.2.2.2 next-hop-self
> > no auto-summary
> >
> >R4
> >router ospf 1
> > network 4.4.4.0 0.0.0.255 area 0
> > network 172.168.14.0 0.0.0.255 area 0
> > network 192.168.23.0 0.0.0.255 area 0
> >!
> >router bgp 1
> > no synchronization
> > network 4.4.4.0 mask 255.255.255.0
> > network 40.40.40.4 mask 255.255.255.0
> > neighbor 1.1.1.1 remote-as 1
> > neighbor 1.1.1.1 update-source Loopback0
> > neighbor 1.1.1.1 next-hop-self
> > neighbor 2.2.2.2 remote-as 1
> > neighbor 2.2.2.2 update-source Loopback0
> > neighbor 2.2.2.2 next-hop-self
> > no auto-summary
> >
> >R5
> >router ospf 1
> > network 5.5.5.0 0.0.0.255 area 0
> > network 172.168.125.0 0.0.0.255 area 0
> >!
> >router bgp 1
> > no synchronization
> > network 5.5.5.0 mask 255.255.255.0
> > network 50.50.50.0 mask 255.255.255.0
> > neighbor 1.1.1.1 remote-as 1
> > neighbor 1.1.1.1 update-source Loopback0
> > neighbor 1.1.1.1 next-hop-self
> > neighbor 2.2.2.2 remote-as 1
> > neighbor 2.2.2.2 update-source Loopback0
> > neighbor 2.2.2.2 next-hop-self
> > no auto-summary
> >
> >
> >
> >_________________________________
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>_________________________________
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