Step 2: Verify That the Primary Path Is Operational

Primary paths must always be used in the network if they are available, therefore an LSP always moves back to the primary path after a failure, unless the configuration is adjusted. For more information on adjusting the configuration to prevent a failed primary path from reestablishing, see Preventing Use of a Path That Previously Failed.

Action

To verify that the primary path is operational, enter the following JUNOS command-line interface (CLI) operational mode commands:

user@host> show mpls lsp extensive ingress

user@host> show rsvp interface

Sample Output 1

user@R1> show mpls lsp extensive ingress

Ingress LSP: 1 sessions

192.168.5.1

  From: 192.168.1.1, State: Up, ActiveRoute: 0, LSPname: r1-to-r5

  ActivePath: via-r2 (primary)

  LoadBalance: Random

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

 *Primary   via-r2           State: Up

    Priorities: 6 6

    Bandwidth: 35Mbps

    SmartOptimizeTimer: 180

    Computed ERO (S [L] denotes strict [loose] hops): (CSPF metric: 11)

 10.0.12.14 S 10.0.24.2 S 

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

          10.0.12.14 10.0.24.2

    5 Apr 29 14:40:43 Selected as active path

    4 Apr 29 14:40:43 Record Route:  10.0.12.14 10.0.24.2

    3 Apr 29 14:40:43 Up

    2 Apr 29 14:40:43 Originate Call

    1 Apr 29 14:40:43 CSPF: computation result accepted

  Standby   via-r7           State: Dn

    SmartOptimizeTimer: 180

        No computed ERO.

  Created: Sat Apr 29 14:40:43 2006

Total 1 displayed, Up 1, Down 0

Sample Output 2

user@R1> show rsvp interface 

RSVP interface: 3 active

                  Active Subscr- Static      Available   Reserved    Highwater

Interface   State resv   iption  BW          BW          BW          mark

fe-0/1/0.0  Up         2   100%  100Mbps     100Mbps     0bps        0bps       

fe-0/1/1.0  Up         1   100%  100Mbps     100Mbps     0bps        0bps       

so-0/0/3.0  Up         1   100%  155.52Mbps  155.52Mbps  0bps        0bps

What It Means

Sample output 1 shows that the LSP is operational and is using the primary path (via-r2) with R2 (10.0.12.14) and R4 (10.0.24.2) as transit routers. The priority values are the same for setup and hold, 6 6. Priority 0 is the highest (best) priority and 7 is the lowest (worst) priority. The JUNOS software default for setup and hold priority is 7:0. Unless some LSPs are more important than others, preserving the default is a good practice. Configuring a setup priority that is better than the hold priority is not allowed, resulting in a failed commit in order to avoid preemption loops.