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Catalyst 4500

I want to know if i can know the IP address or the MAC address are connected in each port from Catalyst 4500 and what´s the command to check this informatión.

  • Other Network Infrastructure Subjects

Re: Catalyst 4500

here is an example on how to do that. Requires that the 4500 is the default gateway for the IPs you are looking for.

-> Gi2/1 has a PC with an IP of and MAC address of 0000.1111.2222, and the default gateway for this IP is ( the 4500 vlan 12 interface )

On the 4500 issue the "show mac-address dynamic int gi2/1" to get the mac address.

Then issue the "show ip arp | include 0000.1111.2222" to get the IP address.

If you have the IP and want to know the MAC, just apply the process in reverse.


Re: Catalyst 4500

If your switch has CatOS, the command to find all MAC addresses seen through port x/y is "show cam dynamic x/y" If the switch has IOS, use the command "show mac-address-table interface type x/y".

To find the IP address for a device on a given port, go to a router (the MSFC in the 4500, if you have one) and enter the command "show ip arp (mac-address)" for the mac address you found on the port.




Re: Catalyst 4500

Depending on how new your router is and what code (12.0) or above and if it is running cef , you can on the MSF itself do a "show adjacency vlan XXX detail" and this will give you the ip address , mac address and even the dns name of the pc it is connected to . This is all stored in the cef tables . I have found this to be "Very" handy for one stop shopping for this info . If you are looking for this on on router you can just do a "show adjacency "interface" detail . You would have to cross reference this info with the mac tables of the switch below to see what pc is connected to what port .

New Member

Re: Catalyst 4500

Thanks for your help. The problem is that we don´t have router module in Catalyst 4500.