Troubleshooting guide

System (CPU and Backplane) Health Check
Advanced System Diagnostics and Troubleshooting Guide 71
Related Commands
enable sys-health-check
disable sys-health-check
configure sys-health-check alarm-level [card-down | default | log | system-down |
traps]
configure sys-health-check auto-recovery <number of tries> [offline | online] (BlackDiamond)
configure sys-health-check alarm-level auto-recovery [offline | online] (Alpine or Summit)
Health Check Functionality
The system health check feature can be configured to operate in one of two mutually-exclusive modes:
• alarm-level response action
• auto-recovery response action
The first mode—alarm-level—is a user-configurable log level; the second—auto-recovery—automatically
attempts to diagnose the suspect module and restore it to operation. The choice between these two
modes normally depends on the network topology, recovery mechanisms implemented, and acceptable
service outage windows.
These modes are configured by two separate CLI commands, described below.
Alarm-Level Response Action
To configure the switch to respond to a failed health check based on alarm-level, use this command:
configure sys-health-check alarm-level [card-down | log | system-down | traps]
where:
Auto-Recovery Response Action
The method for configuring auto-recovery response action depends on the switch platform
(BlackDiamond vs. Alpine or Summit).
BlackDiamond Switches. To configure the switch to respond to a failed health check by attempting to
perform auto-recovery (packet memory scanning and mapping), use this command:
configure sys-health-check auto-recovery <number of tries> [offline | online]
card-down (BlackDiamond only.) Posts a CRIT message to the log, sends an SNMP trap, and
turns off the BlackDiamond module.
default Resets the alarm level to log.
log Posts a CRIT message to the local system log, NVRAM, and to a remote syslog (if
configured).
system-down Posts a CRIT message to the log, sends an SNMP trap, and powers the system down
(reboots in limited function mode).
traps Posts a CRIT message to the log and sends an SNMP trap to the configured trap
receivers.