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Verify the LSP
Purpose
After configuring the LSP, you must verify that the LSP is up. LSPs can be ingress, transit, or egress. Use the show mpls lsp command for quick verification of the LSP state, with the extensive option (show mpls lsp extensive) as a follow-up if the LSP is down. If your network has numerous LSPs, you might consider specifying the name of the LSP, using the name option (show mpls lsp name name or show mpls lsp name name extensive).
Action
To verify that the LSP is up, enter the following command from the ingress router:
user@host> show mpls lsp extensive
Sample Output 1
user@R1> show mpls lsp extensive
Ingress LSP: 1 sessions
10.0.0.6
From: 10.0.0.1, State: Dn, ActiveRoute: 0, LSPname: R1-to-R6
ActivePath: (none)
LoadBalance: Random
Encoding type: Packet, Switching type: Packet, GPID: IPv4
Primary State: Dn
Will be enqueued for recomputation in 25 second(s).
44 Oct 15 16:56:11 CSPF failed: no route toward 10.0.0.6 [2685 times]
43 Oct 14 19:07:09 Clear Call
42 Oct 14 19:06:56 Deselected as active
41 Oct 14 19:06:56 10.1.12.1: MPLS label allocation failure
40 Oct 14 19:06:56 Down
39 Oct 14 18:43:43 Selected as active path
38 Oct 14 18:43:43 Record Route: 10.1.13.2 10.1.36.2
37 Oct 14 18:43:43 Up
[...Output truncated...]
Created: Thu Oct 14 16:04:33 2004
Total 1 displayed, Up 0, Down 1
Egress LSP: 0 sessions
Total 0 displayed , Up 0, Down 0
Transit LSP: 0 sessions
Total 0 displayed , Up 0, Down 0
Meaning
The sample output from ingress router R1 shows that an MPLS label allocation failure occurred and the Constrained Shortest Path First (CSPF) algorithm failed, resulting in no route to destination 10.0.0.6 on R6.
