The requirements for successfully establishing an LDP LSP include:
Run the display mpls ldp session command to check whether an LDP session is correctly set up.
Run the display ip routing-table command to check whether reachable routes are generated.
Run the display mpls ldp peer command to check whether the route outbound interface is the same as the discovery source of the LDP peer.
Check whether the configuration meets the triggering condition for establishing LSPs. You can check the triggering condition for establishing LSPs in the MPLS view. The default configuration is lsp-trigger host.
If the LSP fails to be established although the preceding requirements are met, run the debugging mpls ldp fec command to check the process of establishing this LSP.
Switches, S5700, S7700