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New Member

MPLS MP-IBGP configuration

Hi,

I have configured following senario

PE1-s1/0--------P1---P2------s1/0-PE2

10.10.10.1 10.10.30.2

PE1 -s1/0-10.10.10.1

PE2 -s1/0-10.10.30.2

I have configured the IBGP between PE1 and PE2 with physical interface IP address.

I can see the BGP session is UP between PE1 and PE2.

I have configured (activate) MP-IBGP between PE1 and PE2.

And i received the following message on the PE1 router.

%BGP-4-vpnv4NH_IF:next-hop 10.10.10.1 may not be reachable from neighbour 10.10.30.2 - not a loopback.

Can anyone please explain me what is this mean?

4 REPLIES
Cisco Employee

Re: MPLS MP-IBGP configuration

Ganpat,

You should configure the VPNv4 session using the loopback interface address of the PEs rather than their physical interface IP address.

Using the physical interface IP address will most definitely cause issues.

Regards

Harold Ritter
Sr. Technical Leader
CCIE 4168 (R&S, SP)
harold@cisco.com
México móvil: +52 1 55 8312 4915
Cisco México 
Paseo de la Reforma 222 Piso 19
Cuauhtémoc, Juárez
Ciudad de México, 06600
México
New Member

Re: MPLS MP-IBGP configuration

Thanks for the responce.

Can you please brief me in details what would be the issues ?

Silver

Re: MPLS MP-IBGP configuration

Explanation A VPNv4 route is being sent to the IBGP neighbor indicated in the messages. The next hop is one of the directly connected physical interfaces. It is possible that the label for the address of the next hop is being removed in the MPLS cloud one hop too soon. Because the provider (P) routers do not store VPN information, they do not know where to forward packets that carry the BGP label. If the address is not available at the correct hop, it could break connectivity between VPN sites.

regards

shivlu jain

Silver

Re: MPLS MP-IBGP configuration

please use loopback as your bgp router id also.

regards

shivlu jain

2011
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