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

[Aaron Gould]

This is crazy… I was shutting down some lt interfaces trying to see if I could get traffic to follow that same path via where I saw the p hops reported on traceroute, and I suddenly saw it start working again where it will now show the p hops on traceroute, but a different path this time.  I’m encouraged that p hops are seen on traceroute even via a different path then my previous email showed.  But weird that it works sometimes and not other times.  Not sure why yet.

 

 

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)  0.537 ms  0.452 ms  0.359 ms

2  * * *

3  * * *

4  * * *

5  1.1.10.1 (1.1.10.1)  0.628 ms  0.629 ms  0.527 ms

6  1.1.10.2 (1.1.10.2)  0.580 ms  0.620 ms  0.542 ms

 

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)  0.493 ms  0.471 ms  0.366 ms

2  * * *

3  * * *

4  * * *

5  1.1.10.1 (1.1.10.1)  0.686 ms  0.613 ms  0.523 ms

6  1.1.10.2 (1.1.10.2)  0.600 ms  0.587 ms  0.555 ms

 

r1 at lab-mx104:r1> ping 1.1.10.2

PING 1.1.10.2 (1.1.10.2): 56 data bytes

64 bytes from 1.1.10.2: icmp_seq=0 ttl=59 time=0.705 ms

64 bytes from 1.1.10.2: icmp_seq=1 ttl=59 time=0.769 ms

64 bytes from 1.1.10.2: icmp_seq=2 ttl=59 time=0.645 ms

64 bytes from 1.1.10.2: icmp_seq=3 ttl=59 time=0.638 ms

64 bytes from 1.1.10.2: icmp_seq=4 ttl=59 time=0.615 ms

^C

--- 1.1.10.2 ping statistics ---

5 packets transmitted, 5 packets received, 0% packet loss

round-trip min/avg/max/stddev = 0.615/0.674/0.769/0.056 ms

 

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)  23.530 ms  0.403 ms  0.364 ms

2  1.1.7.2 (1.1.7.2)  0.679 ms  0.586 ms  1.884 ms

     MPLS Label=300208 CoS=0 TTL=1 S=0

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

3  1.1.11.2 (1.1.11.2)  1.481 ms  0.656 ms  0.627 ms

     MPLS Label=300272 CoS=0 TTL=1 S=0

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

4  1.1.6.1 (1.1.6.1)  0.628 ms  0.745 ms  0.640 ms

     MPLS Label=300464 CoS=0 TTL=1 S=0

     MPLS Label=16 CoS=0 TTL=3 S=1

5  1.1.2.2 (1.1.2.2)  0.704 ms  0.648 ms  0.633 ms

     MPLS Label=300400 CoS=0 TTL=1 S=0

     MPLS Label=16 CoS=0 TTL=4 S=1

6  1.1.3.2 (1.1.3.2)  0.662 ms  0.673 ms  0.683 ms

     MPLS Label=300528 CoS=0 TTL=1 S=0

     MPLS Label=16 CoS=0 TTL=5 S=1

7  1.1.10.1 (1.1.10.1)  0.662 ms  0.627 ms  0.669 ms

8  1.1.10.2 (1.1.10.2)  0.713 ms  0.673 ms  0.639 ms

 

r1 at lab-mx104:r1>

 

here’s some traces from the ingress PE r2…  the first trace is from ingress/egress pe’s r2 and r8 loopbacks… the second trace is from the pe/ce interface on r2/r8 facing their respective ce r1/r9…

 

 

[edit]

r2 at lab-mx104:r2# run traceroute 1.1.255.8 source 1.1.255.2

traceroute to 1.1.255.8 (1.1.255.8) from 1.1.255.2, 30 hops max, 40 byte packets

1  1.1.7.2 (1.1.7.2)  0.734 ms  0.495 ms  0.381 ms

2  1.1.11.2 (1.1.11.2)  0.397 ms  0.532 ms  0.375 ms

3  1.1.255.8 (1.1.255.8)  0.564 ms  0.788 ms  0.535 ms

 

[edit]

r2 at lab-mx104:r2# run traceroute 1.1.10.1 source 1.1.0.2 routing-instance test

traceroute to 1.1.10.1 (1.1.10.1) from 1.1.0.2, 30 hops max, 40 byte packets

1  1.1.7.2 (1.1.7.2)  0.722 ms  0.695 ms  0.596 ms

     MPLS Label=300208 CoS=0 TTL=1 S=0

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

2  1.1.11.2 (1.1.11.2)  0.588 ms  0.560 ms  0.528 ms

     MPLS Label=300272 CoS=0 TTL=1 S=0

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

3  1.1.6.1 (1.1.6.1)  0.617 ms  0.744 ms  0.623 ms

     MPLS Label=300464 CoS=0 TTL=1 S=0

     MPLS Label=16 CoS=0 TTL=3 S=1

4  1.1.2.2 (1.1.2.2)  0.696 ms  0.718 ms  0.629 ms

     MPLS Label=300400 CoS=0 TTL=1 S=0

     MPLS Label=16 CoS=0 TTL=4 S=1

5  1.1.3.2 (1.1.3.2)  0.647 ms  0.652 ms  0.628 ms

     MPLS Label=300528 CoS=0 TTL=1 S=0

     MPLS Label=16 CoS=0 TTL=5 S=1

6  1.1.10.1 (1.1.10.1)  0.798 ms  0.712 ms  0.667 ms

 

[edit]

r2 at lab-mx104:r2#

 

- Aaron Gould