Verify the LSP
Purpose
Typically, you use the show mpls lsp extensive command to verify the LSP. However, for quick verification of the LSP state, use the show mpls lsp command. If the LSP is down, use the extensive option (show mpls lsp extensive) as a follow-up. 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 determine whether the LSP is up, enter the following command from the ingress router:
Sample Output
user@R1> show mpls lsp extensive
Ingress LSP: 1 sessions
10.0.0.6
From: 10.0.0.1, State: Up, ActiveRoute: 1, LSPname: R1-to-R6
ActivePath: (primary)
LoadBalance: Random
Encoding type: Packet, Switching type: Packet, GPID: IPv4
*Primary State: Up
Computed ERO (S [L] denotes strict [loose] hops): (CSPF metric: 20)
10.1.12.2 S 10.1.26.2 S
Received RRO (ProtectionFlag 1=Available 2=InUse 4=B/W 8=Node 10=SoftPreempt):
10.1.12.2 10.1.26.2
99 Sep 18 14:19:04 CSPF: computation result accepted
98 Sep 18 14:19:04 CSPF: link down/deleted
10.1.13.1(R1.00/10.0.0.1)->10.1.13.2(R3.00/10.0.0.3)
97 Sep 18 14:19:01 Record Route: 10.1.12.2 10.1.26.2
96 Sep 18 14:19:01 Up
95 Sep 18 14:19:01 Clear Call
94 Sep 18 14:19:01 CSPF: computation result accepted
93 Sep 18 14:19:01 MPLS label allocation failure
92 Sep 18 14:19:01 Down
91 Aug 17 12:22:52 Selected as active path
90 Aug 17 12:22:52 Record Route: 10.1.13.2 10.1.36.2
89 Aug 17 12:22:52 Up
[...Output truncated...]
Created: Sat Jul 10 18:18:44 2004
Total 1 displayed, Up 1, Down 0
Egress LSP: 1 sessions
10.0.0.1
From: 10.0.0.6, LSPstate: Up, ActiveRoute: 0
LSPname: R6-to-R1, LSPpath: Primary
Suggested label received: -, Suggested label sent: -
Recovery label received: -, Recovery label sent: -
Resv style: 1 FF, Label in: 3, Label out: -
Time left: 144, Since: Tue Aug 17 12:23:14 2004
Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500
Port number: sender 1 receiver 39024 protocol 0
PATH rcvfrom: 10.1.15.2 (so-0/0/1.0) 67333 pkts
Adspec: received MTU 1500
PATH sentto: localclient
RESV rcvfrom: localclient
Record route: 10.1.56.2 10.1.15.2 <self>
Total 1 displayed, Up 1, Down 0
Transit LSP: 0 sessions
Total 0 displayed, Up 0, Down 0
Meaning
The sample output from ingress router R1 shows that the LSP is using an alternate path rather than the configured path. The configured path for the LSP is R1 through R3 to R6, and for the reverse LSP, R6 through R3 to R1. The alternate path used by the LSP is R1 through R2 to R6, and for the reverse LSP, R6 through R5 to R1.
