how to find the port number

[hatimation]

Hi Dear Expert,

in big network environment ,  one user coplain about his IP phone not working but the his PC working find.

help desk man provide me with ma address for both PC and ip phone (he give me the last portion of mac address like (0EA5 and OB5A)

to know witch switch port number the the ip phone and PC connect to. in that place there are 4 switches and one router.

for me i have the IP addresses for all switches and router and i can log in remotly but Im asking what is the correct step to follow to find the

the port number and solving the problem..........pls your help

[Jernej Vodopivec]

You can do one of the following to find switch port number:
a) show cdp neighbour (only for Cisco IP phone with cdp enabled)
b) show mac address-table address mac-address

[hatimation]

please send me the command

[Abzal]

Hi,

1. Start from switch that directly connected to the router or try these commands on each switch one by one:

show mac ad ad | inc 0ea5

show mac ad ad | inc 0b5A

Then find your MAC and interface it's connected to from the output. After that check the neighbor of that port:

2. show cdp ne g1/0/1

If it is a switch then connect to it and go again from step 1-2. Until it is a phone or PC.

And if an output from

sh cdp ne g1/0/1

shows nothing then that port connected to PC only.

Hope it will help.

Best regards,
Abzal