I have an MLPPP link between a 7200 and a 2811 router over 2 T1 lines. One of the T1 lines is showing errors on the 2811 side. The catch is whoever setup the 2811 router did not label the serial interfaces with the circuit ID's. Is there any way to determine which T1 is which from the 7200 side without actually shutting down one of the interfaces?
I have this problem too.