question about cisco 2621 running-config setup

[pkondilys]

Hey Guys,
As always, wanted to first say how helpful you have been in the past!!!

I have a question....
I've setup a cisco 2621 router that is supposed to be a backup to my exisiting live router. The problem I have is that after I loaded the running-config onto the backup router, I have the following 2 lines in the running-config that I don't know if they should be there, or how to get rid of them? My live router doesn't have the following 2 lines:

duplex auto
speed auto

Any help would be great,
Thanks
Paulie

 

[jimmyzz]

Paulie,
The 2 lines are telling your router to set the FastEthernet to auto-detect the speed and duplex mode of your connection to the switch. Auto is the default setting and some IOS version may not display all default settings in your running-config.

If you do a Router>#sh interface <interface-name>, it will display what the router negotiated the connection as. The other option is to hard-code them to the desired modes. Your settings on router interface and the port on the switch which it connects into should match. To change the interface negotiation modes:
Router>conf t
Router>interface <interface-name>
Router>(config-if)speed <auto,100 or 10>
Router>(config-if)duplex <auto, full or half>

The same commands can be applied to your cisco switch. If your router has auto-negotiated your interface connection at the correct modes, then I would not worry about the config, its working correctly.

JimmyZ