Cisco Service Control Application for Mobile Networks

September 5, 2007

NOTICE:

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Products Affected

Problem Description

When SCA-BB 3.0.6/3.1.0 Protocol-Pack#10 is installed over Protocol-Pack#09, some HTTP traffic will be misclassified to Instant Messaging service. This applies to HTTP traffic with a user-agent header field value starting with 'Mozilla'. The problem doesn't occur when PP#10 is installed over previous PP versions or over the SCA-BB 3.0.6/3.1.0 base releases.

Background

One of the techniques to classify HTTP based protocol is to look at the user-agent field value. As part of Protocol-Pack#09, one of the signatures added to support MSN Live Messenger, was based on HTTP user-agent field value to start with 'Mozilla'.

In Protocol-Pack#10, this signature was update not to be based on HTTP user-agent. The entry for 'Mozilla' was not removed from the lookup table while a new entry was introduced to support a new protocol - 'Fring'.

Having both entries in the lookup table simultaneously causes the misclassification.

Problem Symptoms

While upgrading from SCA-BB 3.0.6/3.1.0 Protocol-Pack#09 to 3.0.6/3.1.0 Protocol-Pack#10 accordingly, all HTTP traffic that includes a user-agent field value which starts with portion 'Mozilla' will be misclassified to Instant Messaging service.

This is true only while doing the upgrade from Protocol-Pack#09.

Workaround/Solution

Solution

A fix is planned for the next Protocol-Pack#11.

Workaround

The workaround is to remove the redundant entry and by this to resolve the problem. The workaround should not have any impact on SCE service or performance.

To implement the workaround, run the following CLI commands after the upgrade procedure:

SCE#>configure 
SCE(config)#>interface LineCard 0 
SCE(config if)#>lookup GT_LUT_HTTP_BASED_PROTOCOLS_UserAgents remove-key 'Mozilla' 
SCE(config if)#>exit 
SCE(config)#>exit 

SCE#>copy running-config-all startup-config-all 

DDTS

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Revision History

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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