BGP Control Plane Behavior Overview

The VPN service in IPv6 VPN Services over IPv4 MPLS includes both CE 1 (VRF A) and CE 2 (VRF B). The MPLS base tunnels are established to tunnel endpoints PE 1 and PE 2 at their loopback interfaces. The loopback address for PE 1 is FFFF::1.1.1.1/128; for PE 2, it is FFFF::2.2.2.2/128.

The BGP next hop that is advertised in the MP-BGP update includes the following:

The IPv4 IGP, such as OSPF, advertises the reachability of the loopback interfaces on the PE routers. LDP binds label L2 to 1.1.1.1/32 on the P router.

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