Inter-AS Option A

GNS3: 10 x 3725s
EVE-NG: 10 x IOS-XE 16.6.5s

This lab has two different ISP ASNs connecting to each other over a sub-interfaced link. This link has been placed into the customers VRF, which has been configured on both ASBRs. A standard IPv4 eBGP session has been created across the link to exchange routes. This method is commonly referred to as Option A.

A cheat sheet on the different MPLS options can be found here.

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