loopbak connection between cisco 26xx routers

[tanerdursun]

We have two cisco 2611 routers having WIC-2AS WAN modules.

I have to be sure that these serial WAN ports work well.

Is it possible to connect these two router via a DTE and DCE cables?

What kind of commands should i issue?

I hear that the 26xx series routers can't produce clock signal. Thus, I can't perform such a test.
is this correct?

 

[jimmyzz]

tanerdursun,
There should be no problem connecting the 2611 back-to-back via serial. You just need to get the cabling/clocking combination correct. The DCE end is used for the clocking, so you set the clockrate on the router which the DCE plugs into. A basic serial config would be:

RouterA (DTE)
interface serial0/0
ip address <xxxx>
no shutdown

RouterB (DCE)
interface serial0/0
ip address <xxxxx>
clockrate 2000000
no shutdown

Make sure you active the interface usig the &quot;no shutdown&quot; command. Its sounds simple, but many people overlook this command. If you're still having problems, try swapping the cable ends around (sometimes they are not labelled correctly).

JimmyZ