Step 1: Verify That the LSP Is Established

Purpose

Check that the LSP shown in Figure 4 is established and traversing the path from R1 to R6 through the red links.

Action

To verify that the LSP is established, enter the following JUNOS command-line interface (CLI) operational mode command:

user@host> show mpls lsp extensive

user@host> show mpls lsp

Sample Output

user@R1> show mpls lsp extensive | no-more 

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

  Metric: 100

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

 *Primary                    State: Up

          Include: red    Exclude: blue

    Computed ERO (S [L] denotes strict [loose] hops): (CSPF metric: 20)

 10.1.15.2 S 10.1.56.2 S 

    Received RRO (ProtectionFlag 1=Available 2=InUse 4=B/W 8=Node 
10=SoftPreempt):

          10.1.15.2 10.1.56.2

    6 May 11 19:31:42 Selected as active path

    5 May 11 19:31:42 Record Route:  10.1.15.2 10.1.56.2

    4 May 11 19:31:42 Up

    3 May 11 19:31:42 Originate Call

    2 May 11 19:31:42 CSPF: computation result accepted

    1 May 11 19:31:12 CSPF failed: no route toward 10.0.0.6[5 times]

  Created: Wed May 11 19:29:17 2005

Total 1 displayed, Up 1, Down 0

[...Output truncated...]

Sample Output 2

[edit protocols mpls]

user@R5# run show mpls lsp 

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

To              From            State   Rt Style Labelin Labelout LSPname 

10.0.0.1        10.0.0.6        Up       1  1 FF  100352        3 R6-to-R1

10.0.0.6        10.0.0.1        Up       1  1 FF  100384        3 R1-to-R6

Total 2 displayed, Up 2, Down 0

What It Means

Sample Output 1 from ingress router R1 shows that LSP R1-to-R6 is successfully established as indicated by the Explicit Route Object (ERO) 10.1.15.2 S 10.1.56.2 S, the log message CSPF: computation result accepted, and State: Up. Also, the LSP is routing packets correctly over the red links, avoiding the blue links or the links without any coloring. See Step 3 in Configuring CSPF Tracing for information on the steps CSPF takes to select a path.

Sample Output 2 from transit router R5 shows that LSP R1-to-R6 is transiting R5 as expected.