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Cisco CSS 11500 Series Content Services Switches

Field Notice: *Expired* FN - 27555 - Adaptive Session Redundancy (ASR) Does Not Function Between Cisco CSS 11500 Series Content Services Switches running Certain Versions of WebNS Software


Revised April 17, 2008
December 10, 2003


NOTICE:

THIS FIELD NOTICE HAS BEEN EXPIRED AND IS NO LONGER MAINTAINED OR UPDATED BY CISCO.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

CSS11501

CSS11501S-K9

CSS11503-AC

CSS11506-2AC

CSS11506-2DC

  

Problem Description

If two Adaptive Session Redundancy (ASR) redundant Content Services Switches (CSS) peers run WebNS versions, where one includes the fix for defect CSCdy19162 (registered customers only) , and one does not, the backup box would not see any dormant flows, therefore, during a failover all of the ASR flows would fail.

Background

A fix for defect CSCdy19162 (registered customers only) was introduced into 7.10.3.05 and 7.20.1.04, which broke ASR communication between systems running WebNS prior to these versions. The ASR backup CSS is no longer able to receive and interpret the messages about the dormant flows, which causes ASR to fail.

Problem Symptoms

If two CSSs in a redundant ASR scenario run different versions, where one is prior to 7.10.3.05 or 7.20.1.04 and the other is running 7.10.3.05 or higher or 7.20.1.04 or higher, then in the case of a failover, the ASR will fail. The dormant flows will not get setup on the backup CSS and therefore all sessions will be lost on failover.

Workaround/Solution

If you would like to use the ASR feature, then have both CSSs run WebNS 7.10.3.05 or higher or 7.20.1.04 or higher.

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

CSCdy19162

sticky entries dont get updated when doing persistent requests

  

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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