Topology:
Objective:
Configure MPLS L3VPN and understand it’s working. Currently PE1 & PE2 running iBGP under AS 100.PE1, P1, P2 & PE2 running OSPF as IGP. MPLS backbone running LDP for label distribution, LDP neighbor ship has been established among PE1, P1,P2 and PE2.CE1/CE11 using default routing towards PE1/PE2 respectively.
MPLS VPN used two control plane protocols: LDP and MP-BGP to accomplish MPLS VPN communication.
LDP used for signaling and responsible for distributing label among LSR, however LDP rely on IGP for choosing the best path.MPLS unicast ip forwarding is purely based on IGP and LDP.