LDP LSP Is Down

An LDP LSP is Down after being established.

Check whether the LDP session is correctly established.
Run the display mpls ldp session command to check the displayed Status field. If LDP session status is Operational, the LDP session is established and in Up state. If LDP session status is not Operational, the LDP session is not established.
- If the LDP session is not established, rectify the fault by referring to LDP Session Is Down.
Check whether the LSP establishment policy is configured.
- Run the display this command in the MPLS view. If information similar to the following is displayed:
```
lsp-trigger ip-prefix abc
```
  Check whether the Down LSP is filtered out based on the IP prefix list abc.
- Run the display this command in the MPLS-LDP view. If information similar to the following is displayed:
```
propagate mapping for ip-prefix abc
```
  Check whether the Down LSP is filtered out based on the IP prefix list abc.
- Run the display ip ip-prefix command in the system view. If information similar to the following is displayed:
```
       index: 10               permit  10.1.1.1/32
       index: 20               permit  10.2.2.2/32
```
  The LSP can be established based only on routes 10.1.1.1/32 and 10.2.2.2/32.
- If the preceding IP prefix list is configured, add routing information of the Down LSP to the IP prefix list.