I am certain this is a very basic question but I don't know the answer. I have 2 2811's connected via a private T1 (no Telco in the middle). On one end I am getting an up/down situation on the other down/down. With the exception of setting up the clock to be internal on one end and line on the other I kept the defaults (B8ZS,ESF etc). Secondly on the end with the up/down it does go up/up for maybe 20 seconds and then up/down after that when the interface is brought on line. What exactly is up/down telling me and are there any guesses why it comes up for a few seconds and then goes down?
Thanks for the response. I am using HDLC. I do not have the config handy and won't until after the holiday but as I mentioned it is largely unconfigured at the moment using all of the defaults. I have been able to test the link with a T-Berd and all is OK. I do have CD on each end. I am using WIC's and I do have the cross-over pinout.
Am I correct in assuming that the protocol down state is referring to HDLC in my case?
Make sure that your timeslots are mapped correctly for both sides. If using all 24 DS0's and if Nx64 or not. If the line comes up shortly, also check the clocking on the line. If no telco then one side needs to clock and the other needs to run external clock. The up/down means that you are not seeing the HDLC keepalive from the remote end. I am sure you have all your DCE signals on your Show Interface Serial commands... Try checking the above..Good Luck...
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