Everyone's favorite message: Serial x/x is up, Line Protocol is Down

Agent6376

Just got my 3640 router in along with my NM-4A/S and NM-1FE1R2W, so I decided to give my first attempt at router on a stick. I previously had two 2501s connected back to back with my crossover serial cable with no issues. I'm now taking one of the 2501's and connecting it to the 3640 and I cannot seem to get an up/up.

Tried PPP and HDLC encapsulation (making sure that both routers were using the same encapsulation), no dice. When I do a debug ppp packet, each router sends LCP messages, but does not receive them. Am I missing something here, or should I talk to the ebay seller I got this from? Thanks!

msteinhilber

Did you set the clock rate?

Agent6376

I did, sorry. Forgot to add that in there. Clock Rate was set at both 4000000 and 2000000. This was done on the DCE side of the connection by using show controller serial x/y and verifying that the right side of the cable was locally connected.

kalebksp

Agent6376 wrote: »

Clock Rate was set at both 4000000 and 2000000.

Try setting that lower, maybe 64000.

Agent6376

Thank you both gentlemen, I guess this is why using real equipment helps. I doubt I would have had an issue with my previous configuration in a simulation.

captobvious

FYI

Here are the features of the 4-port (NM-4A/S) and 8-port (NM-8A/S) asynchronous/synchronous (async/sync) network module:

• It has four or eight async/sync ports.
• It uses Cisco 60-pin "5-in-1" connectors (same as Cisco 2500 and Cisco 7000).
• It uses the same cabling as Cisco 2500 and Cisco 7000.
• The maximum speed is 115.2 kbps for async, 128 kbps for the sync external clock, and 125 kbps for the internal clock.

Understanding 4- and 8-Port Async/Sync Network Modules