Identify Device on a port

[TroyV]

How can I identify a device on a Cisco switch that I think may be problematic? Are there any commands or tools that will get me the MAc or Ip of devices on ports?

 

[youcandoit]

sho mac-address-table [address] depending on your version this will sho macs connected to this device.

 

[chieftan]

You will only be able to get the IP address from a layer 3 device.

Get the MAC address as shown and then on a layer three device look at the ARP table and this should give you the IP address related to the MAC address.

If you want to delve even further, then you can open a command prompt and type the following:-

ping -a <IP Address>

and this should bring you back the domain name of the node.

 

[TroyV]

I need to find the device, so I can't get the MAC until then. I thought there may be a way to get the MAC or IP address of devices on a switch's ports. From here I can etermine what it is and locate it.

 

[avilov]

have you seen that document? it has some useful info

http://www.cisco.com/warp/public/473/53.shtml

 

[jonks]

I use solarwinds switch port mapper. excellent software that maps your whole switch see link below.

http://www.solarwinds.net/Tools/Engineer/Categories/Network_Discovery.htm

You can download a 30 day trial

 

[lerdalt]

You might also want to try the cammer perl script. Needs a couple of tweaks to work with newer switches, but works pretty well to map out all end devices on a switch.

http://people.ee.ethz.ch/~oetiker/webtools/mrtg/pub/contrib/