Virtual Hub-and-Spoke in BGP/MPLS VPNs
Hou-Wa J. Jeng, Jim Uttaro, Luay Jalil, B. Decraene, Y. Rekhter, R. Aggarwal · 2013
With BGP/MPLS Virtual Private Networks (VPNs), providing any-to-any connectivity among sites of a given VPN would require each Provider Edge (PE) router connected to one or more of these sites to hold all the routes of that VPN.The approach described in this document allows the VPN service provider to reduce the number of PE routers that have to maintain all these routes by requiring only a subset of these routers to maintain all these routes.Furthermore, when PE routers use ingress replication to carry the multicast traffic of VPN customers, the approach described in this document may, under certain circumstances, reduce bandwidth inefficiency associated with ingress replication and redistribute the replication load among PE routers. Status of This Memo This is an Internet Standards Track document.This document is a product of the Internet Engineering Task Force (IETF).It represents the consensus of the IETF community.It has received public review and has been approved for publication by the Internet Engineering Steering Group (IESG).Further information on Internet Standards is available in Section 2 of RFC 5741.