A remote MPLS LDP session can only be established after LSR IDs are configured and MPLS LDP is enabled on both ends of the MPLS LDP session.
Usage Scenario
Remote LDP sessions are used in LDP over TE and L2VPN scenarios:
- LDP over TE: If the core area on an MPLS network supports TE and the edge devices run LDP, two LSRs on the edge establish a remote LDP session. LDP over TE allows a TE tunnel to function as a hop on an LDP LSP.
- L2VPN: Devices exchange protocol packets over an LDP session. If the devices are indirectly connected, a remote LDP session must be configured. However, no remote LDP session needs to be configured for a static PW.
Pre-configuration Tasks
Before configuring a remote LDP session, configure static routes or an IGP to ensure that IP routes between LSRs are reachable.