Cisco Router: Which IP is connected to which port?


This isn’t any great revelation I know, it’s simply a reminder-to-self, because I seem to have a mental block when it comes to this.

show arp

show mac

And that’s it.  The arp table will give you the ip-to-mac mapping, and the mac table will give you the mac-to-port mapping.

  1. #1 by Terra on January 20, 2009 - 2:30 am

    well written post…thank you

  2. #2 by jnm on June 28, 2011 - 1:11 am

    It makes me sad that the only positive comment here is spam. My tired brain really needed this post; I was about to “traceroute mac ip” tons of addresses. Thank you!

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