Brief:
MPLS L3VPN Inter-AS Option B aka MPLS VPN Inter-AS with ASBRs Exchanging VPN-IPv4 Addresses, is similar to the previous Option A example with the exception that the Inter-AS link runs a single VPNv4 EBGP peering instead of multiple VRF aware IGP or BGP instances. In this procedure, the PE routers use IBGP to redistribute labeled VPN-IPv4 routes either to an Autonomous System Border Router (ASBR), or to a route reflector of which an ASBR is a client. The ASBR then uses EBGP to redistribute those labeled VPN-IPv4 routes to an ASBR in another AS, which in turn distributes them to the PE routers in that AS, or perhaps to another ASBR which in turn distributes them, and so on.
- Project Name:
- MPLS L3VPN Inter-AS Option B
- Description:
-
Enterprise MPLS L3VPN Inter-AS Network Design and Implementation
- Key Configuration:
- MPLS Enablement, LDP Neighbor Establishment, VRF Configuration, Route Target Import/Export, MP-BGP VPNv4 Address Family, ASBR VPNv4 eBGP Peering, PE-CE Routing, End-to-End Traffic Validation
