I am trying to migrate a P2P serial interface from a 3640 router to a 3845 router but noticed that interface is down.The config is shown below.interface Serial0/1----2811 router description ip address x.x.x.1 255.255.255.252 encapsulation pppinterfa...

I needs ideas on how best to go about troubleshooting a link with a very iregular return time. I have checked the LAN and there is no problem and the Service provider also said there is no problem from his side. Please give ideas. Many thanks.