I have a cisco 1721 router. I have t1 configured between two offices. I am getting an up up but can not pink the serial interface from own router therefore can not route between the offices. Can anyone help
Thank you all for your quick replys. I figured out the problem. I was using an external dsu with an interface that had a built in dsu. In the external dsu I split the data lines to be 1-10. I put in the statement "service-module t1 timeslots 1-10" into each serial interface along with making sure my classless route was correct, and I had connectivity. Thanks again, this is my first time using this group.
Can you show cdp neighbor and get the router on the other end of the serial intf? If so, check your ACLs and make sure icmp is allowed. Even if it is on the actual router you're pinging from...a misconfigured ACL can prevent even local pings.
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