Data Link Layer Protocol Flapping Or Traffic Forwarding Failure On Serial Interface; Symptom; Solution; Related Commands - H3C SR6600 Series Troubleshooting Manual

Execute the display hardware internal module serial interface-number statistics

command in probe view to collect statistics of the serial interface, including the CPU
statistics.
Execute the display hardware internal module cpos interface-number statistics

command in probe view to collect the FPGA information of the interface module
Data link layer protocol flapping or traffic
forwarding failure on serial interface

Symptom

The data link layer protocol state flaps or the traffic forwarding fails on the serial interface.

Solution

To resolve the problem:
1. If the serial interface is physically down, follow the steps described in
serial interface
2. If the problem persists, collect the following statistics and contact H3C Support:
Execute the display hardware internal module interface-number command in probe view

to determine whether the serial interface has received or sent error packets and collect
packet statistics.
Use the debugging physical packet command to enable packet debugging on both

devices to verify that they can correctly send and receive packets. Collect packet sending
and receiving statistics.
Execute the display hardware internal module cpos interface-number statistics

command in probe view to collect statistics of the CPOS interface.
Execute the display hardware internal module cpos interface-number reg 0 command in

probe view to collect the CPLD information of the CPOS interface.
Execute the display hardware internal module cpos interface-number reg 1 command in

probe view to collect the FPGA information of the CPOS interface.
Collect the chip register information of the CPOS interface by executing the following

commands in probe view:
−
−
−
Execute the display hardware internal module serial interface-number statistics

command in probe view to collect statistics of the serial interface, including the CPU
statistics.
Execute the display hardware internal module cpos interface-number statistics

command in probe view to collect the FPGA information of the interface module

Related commands

This section lists the commands that you might use for troubleshooting CPOS interfaces.
down" to resolve the problem.
display hardware internal module cpos interface-number reg 2.
display hardware internal module cpos interface-number reg 3.
display hardware internal module cpos interface-number reg 4.
7
.
"CPOS interface and
.