Is there a reason that a traceroute mac would work from some MACs and not others? It seems VERY inconsistent for me. Sometimes the same MAC will work then randomly not work.
Here's what I get:
CiscoL3Device#traceroute mac 309c.0000.b1b0 309c.0000.b1b0
Unable to send a l2trace request to 172.16.0.1. Timed out
Layer2 trace aborted.
CDP is enabled on every switch and I can perform a traceroute mac on other MACs from the same switch.
Go to Solution.
I figured it out!
L2 traceroutes can only work if all the switches are in the same network. If you have a VoIP phone or another switch-like thing in between the device and access switch, it will fail.
The clue for me was the "Unable to send a l2trace request to 172.16.0.1." 172.16.0.0 is my voice VLAN, so it's a different network from the management VLAN that my switches use.
Hope this helps someone in the future!
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Hi @robschn ,
Check this link, maybe can give some help:
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