Routing Tables on PE Routers

This topic identifies the routing tables implemented in the PE router to support MPLS VPNs.

< Global routing table, which contains core routes (filled with core IGP) and Internet routes (filled with IPv4 BGP)

PE routers contain a number of routing tables:

< Global routing table, which contains core routes (filled with core IGP) and Internet routes (filled with IPv4 BGP)

• VRF tables for sets of sites with identical routing requirements

• VRFs filled with information from CE routers and MP-BGP information from other PE routers

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The PE routers fulfill various routing requirements imposed on them by using a number of IP routing tables:

■ The global IP routing table (the IP routing table that is always present in a Cisco IOS software-based router even if it is not supporting an MPLS VPN) contains all core routes (inserted by the core IGP) and the Internet routes (inserted from the global IPv4 BGP table).

■ The VRF tables contain sets of routes for sites with identical routing requirements. The VRFs are filled with intra-VPN IGP information exchanged with the CE routers and with VPNv4 routes received through MP-BGP sessions from the other PE routers.

Continue reading here: VPN Label Propagation

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