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:
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:
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