Cisco MDS 9500 Series Multilayer Directors

August 28, 2007

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.

Products Affected

Problem Description

After a hitless upgrade from SAN-OS release 2.(X) to 3.0 or 3.1, if at least one Generation 1 line card is up, creating a port channel ID greater than 128 will power down all Generation 1 line cards.

Note: Generation 1 or a mix of Generation 1 and Generation 2 supported range of Port Channel interface ID's is 1-128. Generation 2 alone supported range of Port Channel interface ID's is 1-256.

Background

The largest port-channel number supported with Generation 1 line cards is 128 and the largest port channel number supported in generation 2 line cards is 256. However, in an environment, where customers have a mix of Generation 1 and Generation 2 line cards, customer must not configure any port-channel IDs greater than 128.

Problem Symptom

Generation 1 line cards suddenly power down after users create port channel ID greater than 128 in a mix Generation 1 and Generation 2 line cards environment.

This problem only occurs in a hitless upgrade from SAN-OS release 2.(X) to 3.0 or 3.1.

Note: This problem does not happen in a hitful upgrade.

Workaround/Solution

Users must not create port-channel with port-channel ID greater than 128 where they have a mix of Generation 1 and Generation 2 line cards.

The following two scenarios describe possible workarounds:

1. Before user has encountered this problem:

   After a hitless upgrade, if user has not yet created any port-channels greater than 128, user can recover from this problem by powering down and powering back up any one of the Generation 1 line cards. This action should activate the error-check on the port channel command.

2. User accidentally created a port-channel greater than 128:

   If user has already encountered this problem after a hitless upgrade, the only work around would be to power down all Generation 1 line cards. Delete port channels that are greater than 128. Then power back up the Generation 1 line cards. This action should activate the error-check on the port channel command.

Note: This issue has been addressed in SAN-OS release 3.2.(1) and later versions, which prevents the creation of port channel number greater than 128 in a mixed Generation 1 and Generation 2 line cards environment.

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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