CCNP Lab question

[mikeleahy]

hi
i am setting up a lab for CCNP. i have 2-3 switches, 2 2500, 1 2600 and 2 3810 routers. i was cabling last night and connected two 2500 via serial cable to the 3810 two serial interfaces. routes are sent to the routers but then they disappear and i get a dcli error and the interface is up but the line protocol is down. any ideas why this is?? can i connect a dte cable from one serial in a router to another??? does one have to be configured as a dce?? any help is very much appreciated..

 

[NettableWalker]

You will need to apply clocking to one side (DCE) of each serial link. if this doesn't fix it then post your config + output from show interface command.

MCP,CCA, Net+, 1 quarter CCNP...

 

[mikeleahy]

i was thinking that. how do i make one side a dce??? when i use the clockrate command it keeps saying its only for a dce device??

 

[NettableWalker]

you need a DCE to DTE cable. Plug the DCE end into whichever end you want to add the clocking to. That is how it recognises which is which.

get one from Ebay is the easiest way.

MCP,CCA, Net+, 1 quarter CCNP...

 

[mikeleahy]

i checked ebay and belive i have two of these cables. both ends look the same. how do i tell which end is dce and dte

 

[eurobadger]

I got a couple of these; mine have the ends labelled as DCE & DTE.

If you plug them in & do a show controller, it should tell you where it sees a DCE/DTE.

EB