What information needs to be collected if an MPLS LDP session fails to be established on an S series switch

For S series switches (except the S1700), you need to collect the following information if an MPLS LDP session fails to be established:
1. Detailed information about the session status, which is displayed using the display mpls ldp session verbose command.
2. LDP status (local or remote), which is displayed using the display mpls ldp peer verbose command.
3. Information about sent and received LDP packets on the interface, which is displayed using the display mpls ldp interface [verbose] command. If MPLS LDP is disabled on the interface, no command output is displayed.
4. Information about sent and received LDP packets after the remote session is established, which is displayed using the display mpls ldp remote-peer peer-name command.
5. Information about whether the route to the peer exists, which is displayed using the display ip routing-table x.x.x.x verbose or display fib x.x.x.x verbose command.
6. Information about whether the TCP connection is in Established state, which is displayed using the display tcp status command.
7. Reason why the LDP session is Down, which is displayed using the display mpls ldp event session-down command.

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