[j-nsp] traceroute in mpls vpn's not showing P hops

[Aaron Gould]

Wow, it started working yesterday where I can suddenly see the P hops in traceroute !  I have no idea why !  I did add an additional rsvp te lsp.  However, now when I down one of the te lsp’s and bring it back up, I can no longer see those p hops.

 

I’m using a physical MX104 with 9 logical systems.

 

 

r1 at lab-mx104:r1> traceroute 1.1.10.2 wait 1

traceroute to 1.1.10.2 (1.1.10.2), 30 hops max, 40 byte packets

1  1.1.0.2 (1.1.0.2)  0.466 ms  0.393 ms  0.422 ms

2  1.1.1.2 (1.1.1.2)  0.646 ms  0.567 ms  0.531 ms

     MPLS Label=300336 CoS=0 TTL=1 S=0

     MPLS Label=16 CoS=0 TTL=1 S=1

3  1.1.6.2 (1.1.6.2)  0.541 ms  0.649 ms  0.629 ms

     MPLS Label=300096 CoS=0 TTL=1 S=0

     MPLS Label=16 CoS=0 TTL=2 S=1

4  1.1.10.1 (1.1.10.1)  0.578 ms  0.562 ms  0.617 ms

5  1.1.10.2 (1.1.10.2)  0.738 ms  0.708 ms  0.636 ms

 

After bouncing the rsvp te lsp, depending on which lsp it follows…

 

r1 at lab-mx104:r1> traceroute 1.1.10.2 wait 1

traceroute to 1.1.10.2 (1.1.10.2), 30 hops max, 40 byte packets

1  1.1.0.2 (1.1.0.2)  0.521 ms  0.483 ms  0.370 ms

2  * * *

3  * * *

4  1.1.10.1 (1.1.10.1)  0.605 ms  0.546 ms  0.567 ms

5  1.1.10.2 (1.1.10.2)  0.572 ms  0.573 ms  0.684 ms

 

Or

 

 

r1 at lab-mx104:r1> traceroute 1.1.10.2 wait 1

traceroute to 1.1.10.2 (1.1.10.2), 30 hops max, 40 byte packets

1  1.1.0.2 (1.1.0.2)  0.462 ms  0.401 ms  0.355 ms

2  * * *

3  * * *

4  * * *

5  * * *

6  * * *

7  1.1.10.1 (1.1.10.1)  0.603 ms  0.577 ms  0.611 ms

8  1.1.10.2 (1.1.10.2)  0.798 ms  0.596 ms  0.573 ms

 

Ingress to lsp on r2...

 

[edit]

r2 at lab-mx104:r2# run show route table inet.3

 

inet.3: 1 destinations, 1 routes (1 active, 0 holddown, 0 hidden)

+ = Active Route, - = Last Active, * = Both

 

1.1.255.8/32       *[RSVP/7/1] 00:12:27, metric 3

                      to 1.1.1.2 via lt-0/1/0.3, label-switched-path to-r8

                    > to 1.1.7.2 via lt-0/1/0.27, label-switched-path r2-to-r8

 

[edit]

r2 at lab-mx104:r2# run show mpls lsp ingress

Ingress LSP: 2 sessions

To              From            State Rt P     ActivePath       LSPname

1.1.255.8       1.1.255.2       Up     0       path-to-r8       to-r8

1.1.255.8       1.1.255.2       Up     0 *     r7-r6-r3-r4-r5-r8 r2-to-r8

Total 2 displayed, Up 2, Down 0

 

- Aaron Gould