Overview
Multiprotocol Label Switching (MPLS) is a protocol-agnostic routing technique that forwards the data from one node to the next node based on labels rather than network addresses. MPLS allows data packets to be forwarded at layer-2, switching level- of the OSI model rather than passing upto layer-3. For this reason, it is often referred as operating at layer-2.5
Topology
Instructions
The first step is to configure the interfaces, establish the layer-3 reachability between PE-1 and PE2 via P router using OSPF as IGP protocol
Configure LDP as signalling MPLS protocol on PE1, P1 and PE2 routers. On CE1 and CE2, configure OSPF alone
Post configuration, verify and validate MPLS-LDP neighbourship is up and running b/n PE1 / P1 and P1 / PE2