We have a Point-to-Point Fractional T1 connection between two of our offices. There is a Cisco 1720 on each end. Without any config changes, the connectivity between the offices has started behaving very unusual. Line is up, protocol is up. I can ping servers on both sides of the routers. However, people at the remote location cannot see anything on our section of the domain in Network Neighborhood, we can see them. But if they do a Start-Find-Computer it will find the machine in question. They can open shares on servers located on our side. However, their Outlook clients cannot find the Exchange Server. They can Ping the exchange server from their location. Internet Explorer is also not finding our proxy server - which they can also Ping.
Both interfaces on the routers in question are showing that the line is up, the protocol is up, the circuit is up. However, they are both getting Carrier Transition errors, Loss of Frame errors, input errors, and interface resets.
I have checked: encapsulation, framing, clocking, the circuit. Is it possible that I have a bad CSU/DSU in one of the routers and if yes, how do I tell which router has the faulty module?
Any ideas or suggestions would be appreciated.
Please forgive my astounding ignorance.
Both interfaces on the routers in question are showing that the line is up, the protocol is up, the circuit is up. However, they are both getting Carrier Transition errors, Loss of Frame errors, input errors, and interface resets.
I have checked: encapsulation, framing, clocking, the circuit. Is it possible that I have a bad CSU/DSU in one of the routers and if yes, how do I tell which router has the faulty module?
Any ideas or suggestions would be appreciated.
Please forgive my astounding ignorance.