Can I get rid of "clock rate" command?

[gbiello]

Hello,
I have a 3620 router at my desk that I am trying to pre-configure for a client. I have done several Cisco routers in the past, and never come across the "clock rate" command. It appears in the config for the Serial interface (WIC-1T - will have external CSU/DSU). When I try and remove it from the configuration with "no clock rate 2000000", I get "FECPM PM doesn't support clock rate 0".

Why is it showing up now? I would prefer not to have to have to set it to what it is supposed to be (fract-T1) on site and have to guess the setting to get the line to come up. Do I need the command? Can it be safely ignored? Any idea what it should be?

The router is running image version 12.2(12a). It has a single NM-1FE-2W module with a WIC-1T. The serial interface isn't plugged into anything right now.

Any comments/advice would be appreciated.

thanks,
-gbiello

 

[Degg]

if you are not using the serial interface then it wont do anything. if you are using the serial interface, and are acting as the DCE (pretty sure its DCE and not DTE) then you must use clockrate command. It is used when you are providing clocking on a serial interface to link up a connection. Normally, the router will determine if you are using a DCE or DTE connection and use the clockrate if it is needed. if there is no connection, then the default is to show the clockrate command, I believe.
basically, if you are not using the interface, then it doesnt hurt to leave it in. if you are using the interface, then it needs to be set to the right value. Degg
Network Administrator

 

[gbiello]

Thanks for the reply. The interface is not connected now, so I'm thinking (hoping) it is defaulting to a DCE role, and once the CSU/DSU and line are hooked up it will drop down to a DTE role, and the line will conveniently go away.

 

[LoneGamer]

It's a matter of logic. First of all, all S0 interfaces require a clockrate, as well as any others with a DCE. "no clockrate x" is basically saying "clockrate 0". The reason you can't have a 0 clockrate, is because you're saying 0 bits per second can be transferred. The clockrate value is the # of bits per second transferred.