Guest

Cisco 7200 Series Routers

Field Notice: *Expired* FN - 28135 - Under Rare Circumstances, NPE-G1 May Experience Difficulty During Reboot


Revised April 25, 2008

January 19, 2004

NOTICE:

THIS FIELD NOTICE HAS BEEN EXPIRED AND IS NO LONGER MAINTAINED OR UPDATED BY CISCO.

THIS FIELD NOTICE IS PROVIDED ON AN "AS IS" BASIS AND DOES NOT IMPLY ANY KIND OF GUARANTEE, WARRANTY OR SUPPORT. USE OF THE INFORMATION ON THIS FIELD NOTICE OR MATERIALS LINKED FROM THIS FIELD NOTICE IS AT YOUR OWN RISK. CISCO RESERVES THE RIGHT TO CHANGE OR UPDATE THIS FIELD NOTICE AT ANY TIME.


Products Affected

Product

Top Assembly

Printed Circuit Assembly

Part Number

Rev.

Part Number

Rev.

NPE-G1

800-18896-06 and earlier

all

73-6988-06 and earlier

all

uBR7200 NPE-G1

800-22164-02 and earlier

all

73-6988-06 and earlier

all

  

Problem Description

The NPE-G1 may experience unexpected failures resulting from various issues related to the DDTS referenced below. The problem is estimated to occur in less than point zero five percent of deployed units.

Background

On rare instances, the NPE-G1 may encounter rommon exceptions causing the router to reset. Scenarios include the NPE-G1 going into a loop with TLB exception, NPE-G1 reloading into rommon after watchdog timeout, or incorrect system autoboot.

Problem Symptoms

The following are sample outputs. The scenarios below apply to both NPE-G1 and uBR7200 NPE-G1.

Scenario 1:

In a rare Cisco IOS® software crash case, ROMMON on a 7200 with NPE-G1 may go into loop with a continuous TLB exception

*** TLB (Load/Fetch) Exception *** 
Access address = 0x100 
PC = 0xbfc0ddc8, SP = 0x87fffc18, RA = 0xbfc0f420 
Cause Reg = 0x00000008, Status Reg = 0x30408003 
ROM Monitor Can Not Recover From Exception 
A Board Reset Is Issued 

Scenario 2:

In a rare watchdog crash during NPE-G1 system bootup, system is rebooted and might break into ROMMON with unrecogniezed midplane error.

Self decompressing the image : ##########
%%Error: Unrecognized midplane in chassis

System Bootstrap, Version 12.2(8r)B, RELEASE SOFTWARE (fc1) 
TAC Support: http://www.cisco.com/tac Copyright (c) 2002 by cisco Systems, Inc. 
C7200 platform with 1048576 Kbytes of main memory 

rommon 1 >


Scenario 3:

In a rare watchdog crash during NPE-G1 system bootup, if autoboot is configured 0x2102 or 0x102, system autoboots but incorrectly boots up the first boothelper in the bootflash or the first image in disk0 if disk0 exists rather than booting the desired Cisco IOS image.

Workaround/Solution

This unit does not need to have a return materials authorization (RMA) created since a software workaround is available. Review the following:

Workaround:

Scenario 1 & 2:

NPE-G1

Upgrade boothelper and IOS to one of the following: 12.3(4)T1, 12.3(5a), 12.3(3)B1, 12.2(18)S3, 12.1.(20)E2 or later.

uBR7200 NPE-G1

Upgrade the boothelper and Cisco IOS software to version 12.2.15-BC1 or later.

Scenario 3:

NPE-G1 or uBR7200 NPE-G1

Add a boot alias to point to the disk containing the desired Cisco IOS software image for example disk2:

rommon> alias boot="boot disk2: " 
rommon> sync 
rommon> reset 

If the desired Cisco IOS software image is not the first image on the disk, users will need to specify which image for example disk2:c7200-js-mz.myimage:

rommon> alias boot="boot disk2:c7200-js-mz.myimage" 
rommon> sync 
rommon> reset

Note:?To remove alias, simply do:

rommon> unalias boot

DDTS

To follow the bug ID link below and see detailed bug information, you must be a registered user and you must be logged in.

DDTS

Description

CSCdy35485 (registered customers only)

NPE-G1: router crash on reload with TLB Exception

CSCeb22301 (registered customers only)

NPE-G1 breaks into ROMMON or boot-mode when boot up

CSCec48048 (registered customers only)

npe-g1 reloads into during watchdog crash testing

  

How To Identify Hardware Levels

Use the show c7200 command. Sample output from a show c7200 command on a 7206VXR is show below:

7200VXR>show c7200


C7206VXR CPU EEPROM:
Hardware Revision : 1.0 
Top Assy. Part Number : 800-18896-05
Part Number : 73-6988-05
Board Revision : B0
PCB Serial Number : 29630271
RMA History : 00
Fab Version : 05
Fab Part Number : 28-5082-05
Product Number : NPE-G1
Deviation Number : 0-0

For More Information

If you require further assistance, or if you have any further questions regarding this field notice, please contact the Cisco Systems Technical Assistance Center (TAC) by one of the following methods:

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