How do I configure Inter AS option A for back-to-back VRF connectivity?

• Cisco Inter As Option Data
• Inter Options For Pc

Inter-AS MPLS/VPN Option B To get a full appreciation of how's option B working, let's compare it with option A. In option A scenario, the two ASBR is treating each other as original VPN CE client, so pure ip packets are transiting on the link.

Can anyone please provide me with a sample configuration and topology for back to back VRFs ( Inter-AS option A )?

Basically, I am looking how to configure these two ASBRs (R3 and R4) with Inter-As option A in the above topology. The iBGP peering has already been done. The only thing I am left with to start is the eBGP peering.

Ron Maupin♦

closed as too broad by Ron Maupin♦Mar 14 at 1:24

Cisco Inter As Option Data

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1 Answer

This is only a partial config, as I assume you already have BGP running on the PE routers, and the interfaces are in the correct vrf. Each ASBR treats the other as a CE router:

Do the same for AS 200

Inter Options For Pc

Ron TrunkRon Trunk

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