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Beginner

iBGP Full Mesh Routing Problem

Hello,

I've setup a iBGP full mesh and configured o-hst-cr-re01 as a route reflector client, but still can not ping 10.84.18.5 (ASN 64555) from o-hst-cr-re01. What am I doing wrong? Any help would be appreciated. Thank You.  

8 REPLIES 8
Hall of Fame Guru

Re: iBGP Full Mesh Routing Problem

 

Follow normal troubleshooting procedure. 

 

Are the routes in the BGP table and the IP routing tables in each of the routers in the path. 

 

How far does a traceroute get from the source to the destination ? 

 

Jon

VIP Collaborator

Re: iBGP Full Mesh Routing Problem

A lot to look at here but:

1- You have o-hst-cr-re01 configured as a route-reflector client to o-ew-cr-re01, yet o-hst-cr-re01 is IBGP peering with the other two routers in the AS. It shouldn't be that way. The o-hst-cr-re01 should just peer with o-ew-cr-re01, and not the others if it is to be a route reflector client.

2- Aside from that, it would probably best if it were to be a client to a directly connected peer and not one a couple hops away.

3- You could also have it be a client to the o-ee-cr-re01 and o-sa26-cr-re01 routers and use a cluster ID. Again if doing it that way, it wouldn't IBGP peer with o-hst-cr-re01.

 

Hope this helps

Beginner

Re: iBGP Full Mesh Routing Problem

1- Agreed. I was try to build a full ibgp mesh, hoping that 10.84.18.1 (ASN 64999) could reach 10.84.18.5 (ASN 64555). It did not work, so I made 10.84.18.1 a RR client and 10.84.18.5 was still unreachable.

2. I not sure what you mean/

3. I will try that.

 

Thank You.

VIP Mentor

Re: iBGP Full Mesh Routing Problem

Hello,

 

post the full config of the route reflector and the full config of o-ew-hb-re05 (in ASN 64555) as well...

Beginner

Re: iBGP Full Mesh Routing Problem

The issue is o-ew-hb-re05  Don't know how to reach the o-hst-cr-re01 (10.84.18.1).

In your scenario o-ee-cr-re01 and o-sa26-cr-re01 doesn't send the 10.84.18.1 route to o-ew-cr-re01, because those routers learning that route from o-hst-cr-re01 so it will not send to  any other IBGP peer as per BGP split horizon rule. then how o-ew-hb-re05 knows about 10.84.18.1 ?!!

to get this resolve configure "neighbor 10.84.18.13 route-reflector-client" in o-ee-cr-re01 and o-sa26-cr-re01 (but this is not a best practices) then those routers send the 10.84.18.1 route to o-ew-cr-re01 as a BGP advertisement.

Beginner

Re: iBGP Full Mesh Routing Problem

I configured 10.84.18.13 to be a RR client as suggested but still unable to ping 10.84.18.5 from 10.84.18.1.

 

Beginner

Re: iBGP Full Mesh Routing Problem

Hey guys, I didn't advertise the WAN link between o-hst-cr-re01 and o-sa26-cr-re01 into iBGP...duh. I have reachablity to 10.84.18.5 now. Thanks for all your help.

 

Highlighted
Beginner

Re: iBGP Full Mesh Routing Problem

Are you able to reach without configure command (neighbor 10.84.18.13 route-reflector-client) what I told ?

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