What serial cable do I need for Lab (cisco 2600 and 1600)

whiteford · ‎09-09-2008

Hi,

I am unsure of what cables I need for my small lab. I would like to simulate a WAN I have a spare Cisco 2600 router and a spare Cisco 1600 but no cables.

I was told I could create a WAN by getting 2 serial cables and reversing one so I don't need a CSU/DSU.

Any idea what I need to get, I might just get them off ebay.

Thanks

andrew.prince · ‎09-09-2008

Whuch WAN modules do you have in the 1600?

whiteford · ‎09-09-2008

Hi, I'm not near the 1600 at the moment, all I know is it was originally on a 2mb lease line connected to a NTE device which had the fibre line connected to it which I think is just the CSU/DSU.

Can

Edison Ortiz · ‎09-09-2008

DTE/DCE cables:

http://www.monoprice.com/products/subdepartment.asp?c_id=102&cp_id=10206

You can also find them on eBay as you stated.

Make sure to configure clocking at one end of the link (the DCE side) to bring the point-to-point connection up.

HTH,

__

Edison.

whiteford · ‎09-09-2008

Thanks, what config do I need to add on the DCE router?

Edison Ortiz · ‎09-09-2008

clock rate

See the following URL for a sample config:

http://www.cisco.com/warp/public/116/ppp_back.html

HTH,

__

Edison.

Please rate helpful posts

whiteford · ‎09-10-2008

Great link, but does it matter which one is the DCE and which one is the DTE router, or is it up to me?

I have 2 routers set up without setting the clock ant I can ping from each side, should this happen eventhough I have yet to configure the clock?

Edison Ortiz · ‎09-10-2008

The cable connection will determine which router will be the DCE and DTE. Most cable vendors will physically label it as such.

So, if you've configured 2 routers back-to-back serial and can ping without the clock being configured? That's odd.

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Edison.

whiteford · ‎09-10-2008

That's what I thought, can I run any commands to help?

I'm going to double check.

Edison Ortiz · ‎09-10-2008

This will tell you the cable the router has detected on its end.

On this example, the connecting cable is DTE end.

Router#sh contr | i DTE|DCE

DTE V.35 TX and RX clocks detected.

DTE V.35 clocks stopped.

HTH,

__

Edison.

Please rate helpful posts

whiteford · ‎09-10-2008

Strange, I get this:

LAN-Side#sh contr | i DTE|DCE

DCE 530, no clock

Edison Ortiz · ‎09-10-2008

Please post the show interface from both end of this link.

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Edison.

whiteford · ‎09-10-2008

...and back-to-back is the term for the DTE-DCE crossover in this case?

Thanks Edison