MPLS TE and MPLS VPN
When you are using TE tunnels in an MPLS VPN network, you should know a few specifics.
TE Tunnels Between PE Routers
When two TE tunnels (one for each direction) exist between a pair of PE routers and the Border Gateway Protocol (BGP) next hop of the vpnv4 routes is pointing to the TE tunnels, the VRF traffic flows across the TE tunnels. The packets have two labels: The top label is the TE label, and the bottom label is the VPN label. If TE is enabled on all provider (P) routers but LDP is not, all the VRF traffic must flow over the TE tunnels; otherwise, the traffic only has the VPN label and never gets to the egress PE router. LDP does not have to be running on the TE tunnels in this case, where the PE routers are head ...
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