Question

A service provider PE router runs MP-BGP for an MPLS L3VPN. You capture the VPNv4 update advertised by this PE for customer prefix 10.1.1.0/24 in VRF CUST_A. In the standard MPLS L3VPN forwarding model, what does the VPN label carried in this VPNv4 NLRI tell the ingress (remote) PE to do?

Accepted Answer

It identifies which VRF (or specific CE next hop) the egress PE should use to forward the packet after popping the label

Answer

It is the outer transport label used by the P routers to switch the packet toward the egress PE loopback

Answer

It signals the CE router which route target to import for the received prefix

Answer

It is the LDP label that the ingress PE swaps at the penultimate hop before delivery