Resetting Line Modules And Srp Modules; Double-Bit Errors On Srp Modules; Detecting Double-Bit Errors; Fixing Double-Bit Errors - Juniper E SERIES BROADBAND SERVICES ROUTERS 11.3.X - ERX HARDWARE GUIDE REV 26-9-2010 Hardware Manual

ERX 11.3.x Hardware Guide

Resetting Line Modules and SRP Modules

Double-Bit Errors on SRP Modules

Detecting Double-Bit Errors

Fixing Double-Bit Errors

104
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.
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:
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.
The following message appears on the console if ECC detects a double-bit error:
ALERT 05/10/2000 13:10:33 os: failed: ECC DOUBLE BIT ERROR OCCURRED
Address = 0xe95db10
Data (Upper 32Bits) = 0xe95db20
Data (Lower 32Bits) = 0x55d06c
ECC Data Bits = 0x2b
ECC 1Bit Error Counter =
*** YOU MUST PERFORM A HARD RESET TO CONTINUE ***
ALERT 05/10/2000 13:10:34 os: PROCESSOR EXCEPTION: 0x200n
If ECC detects a double-bit error in a system that contains a redundant SRP module, the
redundant module becomes active and the system continues to operate. However, you
must still troubleshoot the SRP module with the double-bit error. When ECC detects a
double-bit error in a system that does not contain a redundant SRP module, you must
troubleshoot the SRP module immediately. See "Fixing Double-Bit Errors" on page 104.
To fix a double-bit error:
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