Field Notice: FN - 63040 - ACE Module - TCP Flow Issues Force Removal of Version c6ace-t1k9-mz.3.0.0_A1_6_2.bin from CCO - Please Upgrade to c6ace-t1k9-mz.3.0.0_A1_6_2a.bin

February 12, 2008

NOTICE:

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

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Revision History

Revision	Date	Comment
1.0	12-FEB-2008	Initial Public Release

Products Affected

Products Affected
DCAS - ACE04-6500-K9
DCAS - ACE10-6500-K9
DCAS - ACE20-MOD-K9

Problem Description

Several severe outstanding defects in the c6ace-t1k9-mz.3.0.0_A1_6_2 release have been resolved in the c6ace-t1k9-mz.3.0.0_A1_6_2a release. Cisco has removed the c6ace-t1k9-mz.3.0.0_A1_6_2 release from CCO.

Background

Cisco has discovered that several severe defects in the area of correctly handling TCP flows are present in the 3.0.0_A1_6_2 release. Cisco has addressed these issues in the 3.0.0_A1_6_2a release has decided to remove the 3.0.0_A1_6_2 release from CCO.

Problem Symptoms

Users may encounter the following issues when running version 3.0.0_A1_6_2:

Not all RHI routes are in the MSFC routing table after a ft failover.

TCP:RTO doesnt fire in some conditions.

ACE does not always go into fast recovery retransmit when needed.

ACE will not honor a RST with Data even if a FIN was previously seen.

Workaround/Solution

To resolve these potential issues you will need to download and install software version c6ace-t1k9-mz.3.0.0_A1_6_2a.bin or the .zip version which can be found at the Cisco Catalyst 6500 Application Control Engine (ACE) Service Module Software Downloads Page (registered customers only) .

Instructions for installing the software can be found in the Cisco Services Modules Release Notes.

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
CSCsl24291 (registered customers only)	ACE should honor a RST with Data even if a FIN was previously seen
CSCsk91129 (registered customers only)	ACE not always going into fast recovery retransmit when needed
CSCsl23515 (registered customers only)	TCP:RTO doesnt fire in some conditions
CSCsl24338 (registered customers only)	Not all RHI routes are in the MSFC routing table after a ft failover

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:

• Open a service request on Cisco.com
• By email
• By telephone

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