> # About FICON Device Allegiance

> FICON requires serialization of access among multiple mainframes, CLI, and SNMP sessions be maintained on Cisco MDS 9000 Family switches by controlling device allegiance for the currently executing session. Any other session is denied permission to perform configuration changes unless the required allegiance is available.

> Caution | This task discards the currently executing session.

> Copyright 2010-2015, Cisco Systems, Inc. All rights reserved.