R3102-R3103-HP 6600/HSR6600 Routers Interface Configuration Guide

Solution

The fault is very likely caused if the multiplex unit configurations on the SDH transmission device

mismatch the E1 channel numbers on the CPOS interface on your device. This can result in timeslot

inconsistency at the two ends of transmission and also PPP negotiation failures and LCP anomalies.

Besides, if an idle timeslot on a loopback serial interface on the transmission device is used in

transmission, the information that loopback is detected is displayed. Use the debugging ppp lcp error

command to check loopback information.

Follow these steps to solve the problem:

1. Use the display controller cpos e1 command to view the multiplexing paths of the E1 channels or

calculate the multiplexing path as described in "Calculating E1/T1/E3/T3 channel sequence

numbers."

2. Check the con

figurations on the transmission devices against the calculating result in the last step

to make sure the same E1 multiplexing path is configured.