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Cisco 7500 Series Routers

Field Notice: *Expired* FN - 12881 - OSPF/MPLS/CEF Software Defect on Cisco 7500 RSPs


Revised March 01, 2006

August 22, 2000

NOTICE:

THIS FIELD NOTICE HAS BEEN ARCHIVED AND IS NO LONGER MAINTAINED OR UPDATED BY CISCO.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

Comments

Cisco 7500 Series

With an RSP1, RSP2, RSP4, RSP8, RSP7000

Problem Description

The OSPF updates may be corrupted in the Cisco 7500 Series router configured with OSPF, MPLS and CEF. IP routes are temporarily deleted from the IP routing table and a loss of connectivity may occur.

Background

Root cause of CSCdr48014: Not enough cache lines are invalidated when tag packets are switched.

Problem Symptoms

To reproduce this problem the UUT (a MPLS P router) must be forwarding some transient MPLS VPN traffic. We've found 20 pps is enough to recreate this reliably.

The UUT must be using the tag *feature* path. If the turbo path is used, the problem is not seen.

Here is a sample error from a POS interface:

 *May 31 20:06:45.212: %OSPF-4-ERRRCV: Received invalid packet:
 Bad Checksum from 10.3.0.1, POS5/0/0
 *May 31 20:06:55.212: %OSPF-4-ERRRCV: Received invalid packet:
 Bad Checksum from 10.3.0.1, POS5/0/0
 *May 31 20:07:05.212: %OSPF-4-ERRRCV: Received invalid packet:
 Bad Checksum from 10.3.0.1, POS5/0/0

Workaround/Solution

Workaround/ Possible Workaround

Configure the ip cef global configuration command. Then execute the copy running start command and reload. Cisco has found cases that theoretically indicate that CSCdr48014 can occur with non-VIP images and CEF.

Alternative workaround

Enter the memory cache-policy io uncached command.

Note: Be advised that entering this command might sacrifice packet switching performance.

Solution

Upgrade to the following maintenance releases shown in the solution table below.

Solutions for CSCdr48014

IOS Major Release

IOS Maintenance Release

Available

12.0S

12.0(12)S

CCO - August 8, 2000

12.0W5

12.0(10)W5(18a)

CCO - August 14, 2000

12.0ST

12.0(10)ST

CCO - August 28, 2000

12.1

12.1(3a)

CCO -August 1, 2000

12.1E

12.1(3a)E

CCO - September 5, 2000

12.1T

12.1(3a)T1

CCO - August 1, 2000

12.1AA

12.1(4)AA

CCO - September 11, 2000

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

CSCdr48014 (registered customers only)

ospf checksum errors when receiving mpls traffic

Cisco IOS Versions Affected

CSCdr48014 Affected Images

IOS Major Release

IOS Maintenance Release

IOS image

12.0S

12.0(5)S through 12.1(11)S

rsp-*-mz

12.0W5

12.0(5)W5(12) 12.0(6)W5(14) 12.0(7)W5(16) 12.0(9)W5(17)

rsp-*-mz

12.0ST

12.0(9)ST

rsp-*-mz

12.0T

12.0(5)T through 12.0(7)T

rsp-*-mz

12.0XE

12.0(5)XE through 12.0(7)XE

rsp-*-mz

12.1

12.1(1) through 12.1(3)

rsp-*-mz

12.1E

12.1(1)E through 12.1(2)E

rsp-*-mz

12.1T

12.1(1)T through 12.1(3)T

rsp-*-mz

12.1AA

12.1(1)AA through 12.1(3)AA

rsp-*-mz

How To Upgrade Software

Maintenance Solution:

To obtain the next maintenance releases follow the below instructions:

Software Downloading Process

Cisco IOS Planner Software (registered customers only)

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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