Cisco 7500 Series Routers

Field Notice: Cisco 7500 HSA write memory Symptom

September 16, 1999

Products Affected



RSP2 (=)

Cisco 7500 Series Route Switch Processor 2 (RSP2)


Cisco 7500 Series Route Switch Processor 4 (RSP4)

Problem Description

When a 7500 Series Router is:

  • configured with dual RSPs, high system availability (HSA)

  • and is operating with the affected Cisco IOS image (listed below),

  • or is manually configured with slave sync config (the HSA default is to turn on slave auto-sync config)

the router will display an error message and crash when attempting to store a running configuration.

This software defect is tracked with Cisco DDTS CSCdm88958.


The problem was created with CSCdm21062.

Note:?CSCdm21062 was integrated in Cisco IOS 12.0 and 12.0T releases. Because of the difference in source code between 11.1 and 12.0, 12.0 images are not affected and will not display the defect recorded in CSCdm88958.

Problem Symptoms

If a 7500 series router is configured with dual RSPs and has enabled configuration slave sync-ing, the following error message and crash may occur when attempting to store a configuration:

Router#write mem

Building configuration...

% Slave config write error (0)

% Slave config is not opened


*** System received a Bus Error exception ***
signal= 0xa, code= 0x8, context= 0x60e38850
PC = 0x6012fca4, Cause = 0x6020, Status Reg = 0x34008002
DCL Masked Interrupt Register = 0x000000bf
DCL Interrupt Value Register = 0x0000001c
MEMD Int 6 Status Register = 0x00000020

The above symptom occurs when the following commands are used to store a configuration:

  • write memory

  • copy running-config [slot0: | slot1:]



The workaround is to use the following commands, instead of using slave sync config:

  • copy running-config slavenvram:

  • copy running-config startup-config


  1. Do not use affected images if configured with HSA.

  2. Upgrade to 11.1(28.1)CC (interim), 11.1(28)CT or later 11.1CC or 11.1CT maintenance releases.

Note:?Because of the nature of this defect, Cisco IOS 11.1(28.1)CC has been fully regression-tested as a normal maintenance release, making this interim a recommend solution until the next maintenance release is released.

Cisco's standard statement on interim releases:

Cisco normally does not recommend operating a live network with an interim release. Interims should be used only when there is no other solution or workaround available. If an issue arises that requires an interim to be used, Cisco normally recommends a later interim release (28.3, 28.4, 28.5). Interim releases are used to develop new maintenance by adding new features and software defect solutions and are normally not fully regression-tested. As the Cisco IOS train is being developed, it is being tested, so the older the development process (later interim versions), the longer it has been tested. Once the interim release development is complete, a full regression test is implemented and the next maintenance release is released.


This software defect is tracked with Cisco DDTS CSCdm88958 ("RSP HSA SYNC config fails with slave config write error (0)").

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

View bug details for CSCdm88958 (registered customers only)

Cisco IOS Versions Affected

The affected images listed below will be removed from CCO and will not be shipped with new products.

IOS Trains Affected

IOS Maintenances Affected


11.1(27.1)CC through 11.1(28)CC

How To Upgrade Software

Interim Solution:

Cisco IOS interim releases must be obtained through the Cisco Technical Assistance Center (TAC). Please refer the TAC engineer to this Field Notice and defect CSCdm88958 in order to obtain the 11.1(28.1)CC release.

Maintenance Solution:

To obtain the next maintenance release, go to the Software Downloads page.

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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