MPLS and BGP
Posted on 2011-02-14
Junior engineer here, studying MPLS.
This quesiton is regarding a typical MPLS backbone network where you have multiple VRFs on PEs and the PE's peer with a RR.
I want to make sure I understand the role of MPLS and the role of MP-BGP in this process.
Am I correct in assuming that the PE peering with the RR's purpose is to advertise routes for a VRF via MP-BGP? So the actual lables are not getting forwarded via BGP, but rather by LDP?
In other words, when a packet from VRF-BLUE arrives at the PE-1 destined to reach VRF-BLUE on PE-2, the packet will get encapsulated into a label but what protocol will it use to get transported across the MPLS network to the other side?