Troubleshooting guide

80 Advanced System Diagnostics and Troubleshooting Guide
Diagnostics
NOTE
Be aware that the slot information in the log message might be symptomatic of a problem occurring on
another module in the system rather than on the indicated module.
When you have observed log messages indicating missed or corrupted health check packets, use the
show diagnostics command as the next source of information about health check failures.
Viewing CPU Health Check Diagnostic Results—show diagnostics Command
The diagnostic results for the CPU health check are part of the output displayed by the
show diagnostics command.
CPU system health diag results
Total Tx Total Rx Total miss Error Pkt
Slot 1 Type 0: 5315 5315 0 0
Type 1: 5315 5315 0 0
Type 2: 5315 5315 0 0
Type 3: 5315 5315 0 0
Type 4: 5315 5315 0 0
#
#
Slot 7 Type 0: 5315 5315 0 0
Type 1: 5315 5315 0 0
Type 2: 5315 5315 0 0
Type 3: 5315 5315 0 0
Type 4: 5315 5315 0 0
#
#
Slot 8 Type 0: 5314 5314 0 0
Type 1: 5314 5314 0 0
Type 2: 5314 5314 0 0
Type 3: 5314 5314 0 0
Type 4: 5314 5314 0 0
For each slot, the CPU health check sends five different CPU health check test patterns (Type 0 through
Type
4). Counts are maintained for transmitted, received, missed, and corrupted health check packets
for each I/O module in the switch. As in the backplane health check, small numbers of missed health
check packets are probably okay; large numbers of missed health check packets indicate a systematic
problem, such as an MSM control bus transceiver problem or other serious problem. Small numbers of
corrupted packets, appearing occasionally, are probably okay; large numbers of corrupted health check
packets indicate a systematic problem, such as an MSM control bus transceiver problem or other serious
problem.
Analyzing the CPU Health Check Results
• In the output of the show diagnostics command:
— Small counts of missed packets might mean nothing more than that the CPU was busy and a
packet was dropped; excessive numbers of missed packets indicate a systematic problem that
must be isolated and resolved.
— Corrupted packets might occur occasionally; excessive numbers of corrupted packets indicate a
systematic problem that must be isolated and resolved.