How does Inter-AS Option-A function when two PE routers in different autonomous systems are directly connected?

Question

Dereque Datson · Accepted Answer

The two routers treat one another as CE routers and advertise unlabeled IPv4 routes through an EBGP session.

Dereque Datson · Answer

The two routers share all Inter-AS VPNv4 routes and redistribute routes within an IBGP session to provide end-to-end reach.

Dereque Datson · Answer

The two routers establish an MP-EBGP session to share their customers' respective VPNv4 routes.

Dereque Datson · Answer

The two routers share VPNv4 routes over a multihop EBGP session and set up an Inter-AS tunnel using one another's label.

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