Cisco 800 Series Routers

Field Notice: Cisco 811 and 813 IOS Image 12.1(2)XF are Deferred


November 14, 2000


Products Affected

  • Cisco 811
  • Cisco 813

Problem Description

Routers shipped with the Rev-B MPC850 processor and running Cisco® IOS Software Release 12.1(2)XF experience router hangs, intermittent WAN failures, corruption of dynamic random-access memory (DRAM), and protection violations, due to the misconfigration of the CPU type. The affected images are:

  • c800-y6-mw
  • c800-sy6-mw
  • c800-nsy6-mw
  • c800 -oy6-mw
  • c800-osy656i-mw
  • c800-nosy656i-mw  


The problem was found during development testing. The bug was documented in DDTS CSCds37736.  

Problem Symptoms

A Cisco 800 series router that displays MPC860 instead of MPC850 for the CPU type in the output of the show version EXEC command misconfigures the CPU. This situation occurs on routers shipped with the Rev-B MPC850 processor and results in various problems such as intermittent WAN failure, DRAM corruption, and memory protection violations.


The Cisco811 and 813 Cisco IOS Software Release 12.1(2)XF images have been deferred and removed from CCO. Customers are encouraged to upgrade to the Cisco IOS Software Release 12.1(2)XF1 images currently posted on CCO.

Software Center


This defect has Cisco bug ID CSCds37736. If you are a registered CCO user and you have logged in, you can view the bug details.

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) at (800) 553-24HR, (408) 526-7209, or send e-mail to