Guest

Cisco MGX 8800 Series Switches

Field Notice: Replacing PXM-HD On PXM-45-Based MGX 8850 Release 2.x Systems Can Cause Node Corruption


July 11, 2001


Products Affected

Product

Comments

MGX8850-SW-2011

MGX Software Release 2.0.11

MGX8850-SW-2013

MGX Software Release 2.0.13

MGX8850-SW-2014

MGX Software Release 2.0.14

MGX8850-SW-2100

MGX Software Release 2.1.00

MGX8850-SW-2110

MGX Software Release 2.1.10

PXM-HD

MGX 8850 Processor Switch Module Hard Disk for PXM45

Problem Description

PXM-45-based Cisco MGX 8850 nodes running releases of MGX 2.x software can become corrupted when replacing a Processor Switch Module Hard Drive (PXM-HD) back card.

This condition can occur when installing a replacement PXM-HD and/or moving a utilized PXM-HD between nodes.

Background

The PXM-HD back card houses the disk drive containing all node information such as slots, ports, and connections as well as network-related information.

Although not widespread and pervasive, a situation has occurred in which a replacement PXM-HD-with a previously configured node/slot information present-was inserted into a node with the standby PXM-45.

During the software upgrade, the switchcc command was issued, which caused the standby to enable incorrect slot configuration information to the node.

Problem Symptoms

If you insert a PXM-HD into an MGX 8850 node that is running an MGX 2.x software release, you need to clear residual node/slot information.

If a PXM-HD has residual data, the residual configuration could become active if the node is reset or a new/additional ATM Switching Service Module (AXSM) card is inserted.

Workaround/Solution

Two solutions are provided.

Workaround A is for customers who are running redundant PXM-HD configurations.

Workaround B is for customers who are running single PXM-HD configurations.

You can find examples of output for steps in each workaround in the Other Considerations section of this Field Notice.

Workaround A

Use the following steps to install a PXM-HD in the Standby slot.

  1. Insert the PXM-HD and wait until the Standby PXM comes up to the READY state.

  2. From the Active PXM, issue the cc command and navigate to the Standby PXM.

  3. On the Standby PXM, execute the clrlog and clrerr commands.

  4. From the shellconn on the Standby PXM, execute the command deltree "C:SCT/AXSM".

  5. From the shellconn on the Standby PXM, execute the sysClrallcnf command.

  6. Wait until the Standby PXM reboots and comes up to the READY state.

Workaround B

Use the following steps to install a PXM-HD in the Active slot.

  1. Insert the PXM-HD and wait until the Active PXM comes up to the READY state.

  2. On the Active PXM, issue the clrlog and clrerr commands

  3. If you have saved a configuration with the saveallcnf command, you can restore this configuration using the restoreallcnf command.

  4. If there is no saved configuration, issue the clrallcnf command and rebuild the configurations manually.

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

CSCdu32866 (registered customers only)

Enhance nativity checks on Standby PXM-45 & PXM-HD.

Other Considerations

The following output is from Steps 2-5 listed in Workaround A.

  p2spvc22.8.PXM.a > cc 7
  (session redirected)  
  p2spvc22.7.PXM.s > clrlog
  Do you want to clear log file (Yes/No)? y  
  p2spvc22.7.PXM.s > clrerr
  Do you want to clear error log file (Yes/No)? y
  
  p2spvc22.7.PXM.s > sh  
  pxm45> deltree "C:SCT/AXSM"  
  deltree "C:SCT/AXSM"  
  pxm45> sysClrallcnf  
  sysClrallcnf  
  All Cards config will be deleted, and the shelf will be reset.
  Please confirm:[y/n] y
  y
  Creating the .clrcfg file
  Setting clrallcnf as reset reason
  Rebooting the system 
  Syncing ... C:
  Syncing ... D:
  Syncing ... E:
  Syncing ... F:
  (session fell back)  

The following is output from Step 3 in Workaround B.

  p2spvc22.8.PXM.a > clrlog
  Do you want to clear log file (Yes/No)? y
  p2spvc22.8.PXM.a > clrerr
  Do you want to clear error log file (Yes/No)? y
  p2spvc22.8.PXM.a >   
  

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:

Receive Email Notification For New Field Notices

Product Alert Tool - Set up a profile to receive email updates about reliability, safety, network security, and end-of-sale issues for the Cisco products you specify.