Extreme Networks ExtremeWare Version 7.8 Průvodce řešením problémů stáhnout pdf (Strana 112)

112 Advanced System Diagnostics and Troubleshooting Guide

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 clear log diag-status command to clear the hardware

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 show log command.

d Capture the output from the show diagnostics command.

e On a sheet of paper, write down the state of all LEDs on the switch.

2 Use the clear log diag-status command to clear the hardware error codes.

3 Use the reboot command to reboot the system.

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 (<count>) within the specified time interval

(

<time-interval>), the switch stops rebooting and comes up in minimal operation mode.

For more information on the use of this command, see “Configuring Reboot Loop Protection” on

page 43.

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Extreme Networks ExtremeWare Version 7.8 Průvodce řešením problémů Strana 112