Resetting Line Modules And Srp Modules; Double-Bit Errors On Srp Modules; Detecting Double-Bit Errors - Juniper ERX - RELEASE 11.1.X HARDWARE GUIDE 03-23-2010 Hardware Manual

ERX 11.1.x Hardware Guide
Table 14: Troubleshooting High-Temperature Conditions (continued)
Cause of High Operating
Temperature
Cooling fan failure
Module failure
When you have resolved the cause of the high temperature, you must power cycle
the system to reset the modules.

Resetting Line Modules and SRP Modules

Two recessed buttons on line modules and SRP modules provide the mechanisms
for resetting. You can use the NMI software reset button to reset the software on the
module and the module reset button to reset the module. See Figure 9 on page 10.
If a line module fails to respond for an extended time, that module might have a
software problem. You can depress the NMI software reset button with a paper clip
to suspend the current software task. Depending on the situation, this action might
also reset the software on the module.
If depressing the NMI software reset button fails to correct the issue with the line
module, depress the module reset button to reboot the line module.
The buttons work in the same way for the SRP module. Depressing the module reset
button on an SRP module is equivalent to rebooting the router and causes all the line
modules to reboot.

Double-Bit Errors on SRP Modules

SRP modules include error checking and correction (ECC) to protect their SDRAM.
ECC provides error detection of single-bit and double-bit errors and correction of
single-bit errors for the SDRAM as follows:

Detecting Double-Bit Errors

The following message appears on the console if ECC detects a double-bit error:
104

Resetting Line Modules and SRP Modules

Symptoms
FAN OK LED on SRP module is not
illuminated.
FAN FAIL LED on SRP module is
illuminated.
FAIL LED on module is illuminated.
If ECC detects a single-bit error, it automatically corrects the error, and operation
continues.
If ECC detects a double-bit error, it logs the error, stops the main processor on
the controller, and takes the SRP module offline.
Resolution
Replace fan tray. (See "Maintaining ERX
Routers" on page 77.)
Replace module. (See "Installing
Modules" on page 31.)