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Mikhail Faifman
Beginner

L2 Traceroute disabled by default on C1000 switches

I spent quite a bit of time troubleshooting why

 

   traceroute mac sw1_mac1 sw2_mac2

 

works in one direction from C3850 switches to C1000 switches and

 

   traceroute mac sw2_mac2 sw1_mac1

 

does not work, timeout every time.

 

Ultimately I came across a priceless post here that there is

 

    show running-config all

 

which shows the default settings.

 

After comparing C3850 and C1000 config files I found the solution:

 

    l2 traceroute

 

That's it, on C1000 by default L2 Traceroute is disabled while on C3850 it is enabled.

 

Those struggling with L2 Traceroute, just need to run this command and it does the trick:

 

    l2 traceroute

 

   

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