Jon Marshall Mon, 11/10/2008 - 00:53
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This is a 2 step process.

1) Find the mac-address that is connected to the port ie.

sh mac-address-table interface gi0/2

2) Then you need to log on to the device that does the routing for this device which will either be a router or a L3 switch

sh arp | include


gnijs Wed, 11/12/2008 - 06:33
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Or if you have ip dhcp snooping enabled, its easy:

sh ip dhcp snooping binding

John Blakley Wed, 11/12/2008 - 07:03
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I do it the way Jon describes. It works great.

Also a tip, if you're trying to find out where other switches connect to your core (assuming you're doing this on the core), you can do a sh int to find the mac address of that switchport, and then look for that mac address on the other switch to find out what port it connects to. Works well. I just had to map out my network doing it this way.



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