MPLS Layer 3 VPN Migrations
Gonzalo Gómez Herrero, Jan Antón Bernal van der Ven · 2010
If MPLS has revolutionized the internetworking industry over the last ten years, BGP-based Layer 3 VPNs (L3VPNs) are probably their most popular and widespread application. BGP-based L3 VPNs are based on a so-called peer model, in which Customer Edge (CE) and Provider Edge (PE) devices talk to each other by means of a routing protocol or construct, which can be as simple as mutual static routes or even directly connected networks. This chapter deals with the migrations related to MPLS BGP-based L3VPNs, focusing on integrating networks as BGP-based Layer 3 VPNs and migrating through different interconnect models. Routing Information Protocol (RIP) is a distance-vector protocol that uses the Bellman- Ford algorithm for route selection. With all the possible expansion and interconnect models for L3VPNs, there are multiple technical alternatives for migrations. By correctly aligning and combining these alternatives, several strategies for migration can be planned and implemented. Controlled Vocabulary Terms computer network management; multiprotocol label switching; routing protocols; virtual private networks