Extreme Networks ExtremeWare Command Reference Manual page 649

The alarm-level and auto-recovery options are mutually exclusive; configuring an alarm-level disables
auto-recovery, and configuring auto-recovery overrides the alarm-level setting.
In ExtremeWare versions prior to 6.2, you cannot use both mirroring and the system health checker at
the same time. If you configure mirroring with the system health checker enabled, the health checker
will indicate that it has been disabled by sending a message to the syslog. In ExtremeWare 6.2 or later,
this restriction does not apply.
The
auto-recovery
automatically reset a faulty module and bring it online. If the system health checker fails more than the
configured number of attempts, it sets the module to card-down. This threshold applies only to
BlackDiamond I/O modules.
In ExtremeWare 6.2.1 or later, when auto-recovery is configured, the occurrence of three consecutive
checksum errors will cause the packet memory (PM) defect detection program to be run against the I/O
module. Checksum errors may include internal and external MAC port parity errors, EDP checksum
errors, and CPU packet or diagnostic packet checksum errors. If defects are detected, the card is taken
offline, the memory defect information is recorded in the card EEPROM, the defective buffer is mapped
out of further use, and the card is returned to operational state. A maximum of 8 defects can be stored
in the EEPROM.
After the PM defect detection and mapping process has been run, a card is considered failed and is
taken offline in the following circumstances:
• More than eight defects are detected.
• Three consecutive checksum errors were detected by the health checker, but no new PM defects were
found by the PM defect detection process.
• After defects were detected and mapped out, the same checksum errors are again detected by the
system health checker.
The auto-recovery repetition value is ignored in these cases. In any of these cases, please contact
Extreme Technical Support.
If you specify the
recorded in the log:
<WARN:SYST> card_db.c 832: Although card 2 is back online, contact Tech. Supp. for
assistance.
<WARN:SYST> card_db.c 821: Card 2 has nonrecoverable packet memory defect.
To view the status of the system health checker, use the
To enable the health checker, use the
To disable the health checker, use the
The alarm-level
system is backed by an identical system. By powering down the faulty system, you ensure that erratic
ESRP behavior in the faulty system does not affect ESRP performance and ensures full system failover
to the redundant system.
If you are using ESRP with ESRP diagnostic tracking enabled in your configuration, the system health
check failure will automatically reduce the ESRP priority of the system to the configured failover
priority. This allows the healthy standby system to take over ESRP and become responsible for handling
traffic.
ExtremeWare Software 7.3.0 Command Reference Guide
option configures the number of times the system health checker attempts to
option, the module is kept online, but the following error messages are
online
enable sys-health-check
disable sys-health-check
option is especially useful in an ESRP configuration where the entire
system-down
configure sys-health-check alarm-level
command.
show diagnostics
command.
command.
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