Triggering Limited Operation Mode; Bringing A Switch Out Of Limited Operation Mode; Minimal Operation Mode; Triggering Minimal Operation Mode - Extreme Networks BlackDiamond 6804 Troubleshooting Manual

Limited Operation Mode and Minimal Operation Mode

Triggering Limited Operation Mode

On a BlackDiamond system with a single MSM, if a diagnostics test detects errors or if the POST fails,
the system goes into limited operation mode. Similarly, on a Summit or Alpine system, if a diagnostics
test detects errors, the Summit or Alpine switch will go into limited operation mode. When a failure
occurs, the system retains an error code.
In limited operation mode, you must use the
error code so that the module—in the case of a BlackDiamond system, or the switch—in the case of an
Alpine or Summit system, can be brought up after the next reboot.

Bringing a Switch Out of Limited Operation Mode

To bring a switch out of limited operation mode, perform these steps:
1 Begin collecting background information that might help isolate the causes of the problem and
contact Extreme Networks technical support and notify them about the problem.
a Note any recent hardware or configuration changes.
b Create a detailed description of all the known symptoms.
c Capture the output from the
d Capture the output from the
e On a sheet of paper, write down the state of all LEDs on the switch.
2 Use the
clear log diag-status
3 Use the command to reboot the system.
reboot
4 Use the show tech CLI command to collect system information.
5 Send all of the information about the problem to Extreme Networks technical support.

Minimal Operation Mode

If the system reboots due to a failure that persists after the reboot, the system will reboot again when it
detects the failure again, and will continue that behavior across an endless cycle of reboots—referred to
as a reboot loop.
The ExtremeWare reboot loop protection feature provides a mechanism to detect a reboot loop and force
the system into minimal operation mode. In minimal mode, only the CPU, NVRAM, management port, a
minimal set of system tasks, and a minimal subset of CLI commands are active.

Triggering Minimal Operation Mode

To protect against reboot loops, you can configure reboot loop protection using the command:
configure reboot-loop-protection threshold <time-interval> <count>
If the switch reboots the specified number of times (
( ), the switch stops rebooting and comes up in minimal operation mode.
<time-interval>
For more information on the use of this command, see "Configuring Reboot Loop Protection" on
page 42.
104
clear log diag-status
command.
show log
command.
show diagnostics
command to clear the hardware error codes.
<count>
command to clear the hardware
) within the specified time interval
Advanced System Diagnostics and Troubleshooting Guide