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New Member

4948 -Configuraiton of MAC-Address on L3 interface


I was trying to configure Mac-address on 4948 L3 inteface. But there is no command to configure it.

Can any body help whether it supports or not , if yes which image.

I have following image:

show module

Chassis Type : WS-C4948

Power consumed by backplane : 0 Watts

Mod Ports Card Type Model Serial No.


1 48 1000BaseX (SFP) Supervisor(active) WS-C4948 FOX084600RA

M MAC addresses Hw Fw Sw Status


1 0014.1c47.8c40 to 0014.1c47.8c6f 1.1 12.2(20r)EW1 12.2(20)EWA1 Ok

This box came from cisco.




Re: 4948 -Configuraiton of MAC-Address on L3 interface

the 4948 L3 interface already has a MAC address given to it by the manufacturer. the BIA or burned-in-address for the L3 interface will be its MAC.

can you explain why/what you are attempting to configure a MAC address on the L3 interface for? perhaps if we know your goal we can provide a solution.

NOTE: as you can see in your output from above for example, the module in slot 1, a 48 port 1000baseX module, is assigned MAC addresses from "0014.1c47.8c40 >> 0014.1c47.8c6f" (48 macs)

New Member

Re: 4948 -Configuraiton of MAC-Address on L3 interface


Thanks for response. you are true it is assigned MAC address.

But when i configure two port as L3 interafce , MAC address for both port shows same and i'm using "ip address dhcp client identifier" under l3 port through which i send dhcp request with client identifier as MAC address of that port but unfortunately from both DHCP request goes with same MAC-Address thats problem so i want some how to send DHCP request with diff MAC-Address.

Thats reason , i want to configure MAC-Address