> # Upgrade or Downgrade Scenario

> When you are upgrading from a release earlier than Cisco SAN-OS Release 3.1(2), all modules operate with bandwidth fairness disabled until the next module reload. After the upgrade, any new module that is inserted has bandwidth fairness enabled.

> When you are downgrading to a release earlier than Cisco SAN-OS Release 3.1(2), all modules keep operating in the same bandwidth fairness configuration prior to the downgrade. After the downgrade, any new module that is inserted has bandwidth fairness disabled.

> Note After the downgrade, any insertion of a module or module reload will have bandwidth fairness disabled.

> Copyright 2010-2013, Cisco Systems, Inc. All rights reserved.