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Verify the LSP Again
Purpose
After taking the appropriate action to correct the error, the LSP needs to be checked again to confirm that the problem in the IS-IS protocol has been resolved.
Action
To verify that the LSP is up and traversing the network as expected, enter the following command from the ingress, egress, and transit routers:
user@host> show mpls lsp extensive
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
Received RRO (ProtectionFlag 1=Available 2=InUse 4=B/W 8=Node 10=SoftPreempt):
10.1.13.2 10.1.36.2
4 Oct 19 21:22:54 Selected as active path
3 Oct 19 21:22:53 Record Route: 10.1.13.2 10.1.36.2
2 Oct 19 21:22:53 Up
1 Oct 19 21:22:53 Originate Call
Created: Tue Oct 19 21:22:53 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: 117, Since: Tue Oct 19 21:17:42 2004
Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500
Port number: sender 2 receiver 39064 protocol 0
PATH rcvfrom: 10.1.13.2 (so-0/0/2.0) 10 pkts
Adspec: received MTU 1500
PATH sentto: localclient
RESV rcvfrom: localclient
Record route: 10.1.36.2 10.1.13.2 <self>
Total 1 displayed, Up 1 , Down 0
Transit LSP: 0 sessions
Total 0 displayed, Up 0, Down 0
user@R3> show mpls lsp extensive
Ingress LSP: 0 sessions
Total 0 displayed, Up 0, Down 0
Egress LSP: 0 sessions
Total 0 displayed, Up 0, Down 0
Transit LSP: 2 sessions
10.0.0.1
From: 10.0.0.6, LSPstate: Up, ActiveRoute: 1
LSPname: R6-to-R1 , LSPpath: Primary
Suggested label received: -, Suggested label sent: -
Recovery label received: -, Recovery label sent: 3
Resv style: 1 FF, Label in: 100416, Label out: 3
Time left: 139, Since: Tue Oct 19 21:05:11 2004
Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500
Port number: sender 2 receiver 39064 protocol 0
PATH rcvfrom: 10.1.36.2 (so-0/0/3.0) 11 pkts
Adspec: received MTU 1500 sent MTU 1500
PATH sentto: 10.1.13.1 (so-0/0/2.0) 11 pkts
RESV rcvfrom: 10.1.13.1 (so-0/0/2.0) 11 pkts
Explct route: 10.1.13.1
Record route: 10.1.36.2 <self> 10.1.13.1
10.0.0.6
From: 10.0.0.1, LSPstate: Up, ActiveRoute: 1
LSPname: R1-to-R6 , LSPpath: Primary
Suggested label received: -, Suggested label sent: -
Recovery label received: -, Recovery label sent: 3
Resv style: 1 FF, Label in: 100448, Label out: 3
Time left: 135, Since: Tue Oct 19 21:10:22 2004
Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500
Port number: sender 1 receiver 47951 protocol 0
PATH rcvfrom: 10.1.13.1 (so-0/0/2.0) 4 pkts
Adspec: received MTU 1500 sent MTU 1500
PATH sentto: 10.1.36.2 (so-0/0/3.0) 4 pkts
RESV rcvfrom: 10.1.36.2 (so-0/0/3.0) 4 pkts
Record route: 10.1.13.1 <self> 10.1.36.2
Total 2 displayed, Up 2 , Down 0
user@R6> run show mpls lsp extensive
Ingress LSP: 1 sessions
10.0.0.1
From: 10.0.0.6, State: Up, ActiveRoute: 1, LSPname: R6-to-R1
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: 2)
10.1.36.1 S 10.1.13.1 S
Received RRO (ProtectionFlag 1=Available 2=InUse 4=B/W 8=Node 10=SoftPreempt):
10.1.36.1 10.1.13.1
19 Oct 19 21:09:52 Selected as active path
18 Oct 19 21:09:52 Record Route: 10.1.36.1 10.1.13.1
17 Oct 19 21:09:52 Up
16 Oct 19 21:09:52 Originate Call
15 Oct 19 21:09:52 CSPF: computation result accepted
Created: Tue Oct 19 18:30:09 2004
Total 1 displayed, Up 1 , Down 0
Egress LSP: 1 sessions
10.0.0.6
From: 10.0.0.1, LSPstate: Up, ActiveRoute: 0
LSPname: R1-to-R6 , 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: 120, Since: Tue Oct 19 21:15:03 2004
Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500
Port number: sender 1 receiver 47951 protocol 0
PATH rcvfrom: 10.1.36.1 (so-0/0/3.0) 4 pkts
Adspec: received MTU 1500
PATH sentto: localclient
RESV rcvfrom: localclient
Record route: 10.1.13.1 10.1.36.1 <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 and egress router R6 shows that the LSP is now traversing the network along the expected path, from R1 through R3 to R6, and the reverse LSP, from R6 through R3 to R1. In addition, the sample output from transit router R3 shows that there are two transit LSP sessions, one from R1 to R6, and the other from R6 to R1.
