Double-Bit Errors On Srp Modules; Detecting Double-Bit Errors; Fixing Double-Bit Errors - Juniper E Series Hardware Manual

E-series Hardware Guide

Double-Bit Errors on SRP Modules

Detecting Double-Bit Errors

Fixing Double-Bit Errors

108 !

Double-Bit Errors on SRP Modules

If depressing the software reset button fails to correct the issue with the line
module, depress the board reset button. This action reboots the line module.
The buttons work in the same way for the SRP module. Depressing the board reset
button on an SRP module is equivalent to rebooting the E-series 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. If
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
Errors.
To fix a double-bit error:
1. Remove the second SRP module, if there is one.
2. Reboot the system with the board reset button on the primary SRP module (see
Figure 12).
These actions attempt to correct a transient double-bit error. However, if the console
displays a memory test failure for the SRP module after you reboot, or if the FAIL
LED on the SRP module stays on during rebooting, the SDRAM is permanently
damaged and needs replacing. In this event, call Juniper Networks Customer
Service to arrange for repair.
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Fixing Double-Bit