Scaling and Extending VPLS with LDP-BGP VPLS Interworking

VPLS is a key technology in the delivery of multipoint Ethernet service. The MPLS VPN market has seen explosive growth, and is forecast to continue growing. This increasing demand for VPLS requires a highly scalable VPLS network that supports many VPLS customers having multiple sites spread across geographically dispersed regions. A critical factor in growing a VPLS network is how well the underlying VPLS control plane scales. This white paper presents various interworking mechanisms that leverage BGP VPLS to scale VPLS implementations and augment existing LDP VPLS networks. The paper also discusses the use of BGP VPLS to extend the reach of VPLS from a single LDP-VPLS metro domain into the intermetro WAN. This scheme allows service providers to offer regional and/or national VPLS in a scalable and transparent way.

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