Step 1: Verify the LSP

To verify the LSP, enter the following command on the ingress, transit, and egress routers:

user@host> show mpls lsp extensive

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

   11 Oct 19 18:06:04 No Route toward dest[78 times]

   10 Oct 19 17:08:09 Deselected as active

  Created: Mon Oct 18 21:48:42 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

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: 0 sessions

Total 0 displayed, Up 0, Down 0

user@R6> show mpls lsp extensive

Ingress LSP: 1 sessions

To              From            State Rt ActivePath       P     LSPname

10.0.0.1        10.0.0.6        Dn     0 -                      R6-to-R1

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

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

    5 Oct 19 10:37:55 Selected as active path

    4 Oct 19 10:37:55 Record Route:  10.1.13.2 10.1.36.2

    3 Oct 19 10:37:55 Up

    2 Oct 19 10:37:10 No Route toward dest[1029 times]

    1 Oct 18 21:48:42 Originate Call

  Created: Mon Oct 18 21:48:42 2004

Total 1 displayed, Up 1, Down 0

Egress LSP: 0 sessions

Total 0 displayed, Up 0, 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: 1 sessions

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: 100368, Label out: 3

  Time left:  154, Since: Tue Oct 19 10:25:24 2004

  Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500

  Port number: sender 1 receiver 47933 protocol 0

  PATH rcvfrom: 10.1.13.1 (so-0/0/2.0) 209 pkts

  Adspec: received MTU 1500 sent MTU 1500

  PATH sentto: 10.1.36.2 (so-0/0/3.0) 209 pkts

  RESV rcvfrom: 10.1.36.2 (so-0/0/3.0) 209 pkts

  Record route: 10.1.13.1 <self> 10.1.36.2

Total 1 displayed, Up 1, Down 0

user@R6> show mpls lsp extensive

Ingress LSP: 1 sessions

10.0.0.1

  From: 10.0.0.6, State: Dn, ActiveRoute: 0, LSPname: R6-to-R1

  ActivePath: (none)

  LoadBalance: Random

  Encoding type: Packet, Switching type: Packet, GPID: IPv4

  Primary                    State: Dn

    2 Oct 19 13:01:54 10.1.56.2: MPLS label allocation failure[9 times]

    1 Oct 19 12:57:51 Originate Call

  Created: Tue Oct 19 12:57:51 2004

Total 1 displayed, Up 0, Down 1

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:  148, Since: Tue Oct 19 10:30:03 2004

  Tspec: rate 0bps size 0bps peak Infbps m 20 M 1500

  Port number: sender 1 receiver 47933 protocol 0

  PATH rcvfrom: 10.1.36.1 (so-0/0/3.0) 206 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

Sample Outputs 1, 2, and 3 show that the LSP and the reverse LSP are down:

Sample Output 1 from ingress router R1 shows that LSP R1-to-R6 does not have a route towards the destination (R6).
Sample Output 2 from transit router R3 shows that there are no LSP sessions.
Sample Output 3 from egress router R6 also shows that reverse LSP R6-to-R1 is down.

Sample Outputs 4, 5, and 6 show that the LSP is up and the reverse LSP is down:

Sample Output 4 from ingress router R1 shows that LSP R1-to-R6 is up and there are no egress LSP sessions.
Sample Output 5 from transit router R3 shows that there is one ingress LSP session (R1-to-R6) and no egress LSP sessions.
Sample Output 6 from egress router R6 shows that LSP R6-to-R1 is down due to an MPLS label allocation failure.