DISQUS

Caveman · 4 years ago

I have used this primarily on 2950 and 3550 switches running IOS. If you find any others this works on, or you find switches it does not work on, please let me know. Thanks.

It does not work on:
- 4000 series w/ CatOS

dat · 4 years ago

thank for this useful guide.

aaronm · 3 years ago

If you can do all this on a network, they have some serious security concerns.... 8O

AWfki · 3 years ago

"show mac-address-table 0000.0000.0000" is too much typing for me, especially as I'm frequently called on to find which interface a server or user is connected to. Because I'm lazy in an efficient kind of way I add the "shmac" alias to all my switches.

In config mode enter alias exec shmac SH MAC-address-table | include

Now when you want to find a server that's got a mac address of 0102.0304.0506 you can just type shmac 0506
and nine times out of ten you'll get the entry you're looking for. You may get multiple entries if you've got two devices with MACs ending in 0506 so you could type the whole MAC address, but I did mention that I'm "efficient" so I rarely do.

I'd also like to note that while the author's network may always use gig interface for switch connections it's perfectly possible for a user to be connected to one so that's not actually a guarantee that's it's an interswitch link. Figuring that out requires that you know your network; which means that I can't think of a simple to explain way to figure out where the port shown leads to another switch.

Tony · 10 months ago

Is there a method if you don't have access (telnet) to the switch? Like the Fluke LinkRunner device.