Find port from IP/Mac on Cisco

Today I wanted to know what port I was plugged in with out having to go down to the patch panel. I have done this before and I had to google it every time. Hopefully writing it down (here) will help me remember it.

Side note: I am performing this from my Router because I don’t even know the IP for the switch I am currently on.

  1.  Show arp *ip address*     – This just gets us the MAC address is cisco format for next step.
  2.  traceroute mac *mac addy* *mac addy* – use mac address from before. not sure why but paste it twice.
  3. That’s it!


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