Inter-AS Option B

This lab is a very simple setup with two different ISP ASNs connecting to each other and exchanging VPNv4 routes over an MP-BGP session. To retain the VPNv4 prefixes the no bgp default route-target filter command has been configured on each ASBR. This method of inter-AS operation between MPLS providers is commonly referred to as Option B. A cheat sheet on the different MPLS options can be found here.

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