The MIB module for the management of zoning within the framework of Cisco's Zoning Server (ZS) Archi- tecture which realizes the FC-GS4/SW3 requirements for Zone Server. This MIB is an extension to the CISCO-ZS-MIB, which is for managing zoning conforming to FC-GS3/SW2. The FC-GS4 specification is Fibre-Channel - Generic Services - 4 T11/ Project 1505-D/Rev 7.8. The SW3 specification is Fibre-Channel - Switch Fabric - 3 T11/Project 1508- D/Rev 6.6. GS4/SW3 allows zoning to operate in either basic or enhanced mode of operation. Basic mode is essentially GS3/SW2 compatible mode (as modelled by CISCO-ZS-MIB). Enhanced mode of operation provides additional capabilities. In enhanced mode of operation, all the configuration should be done within the scope of a session. The current 'Running Configuration' on the local device for zone server is called the 'effective' database. When the first configuration command on the zone server data is received, a snapshot of the current 'effective database' is taken on the local device. This snapshot is called the 'copy' database. An implicit session is started by the Zone Server on the local device and all subsequent SET operations take place in the context of this session. The 'copy' database is used for all further modifications in the session. There can be only one session active in the entire Fibre Channel fabric. The user who initiates the creation of this 'copy', is called the owner of session. When a session has been created on a device in the Fibre Channel fabric, if an attempt is made to start a session from any other device in the fabric, it results in error. Once the modifications to the 'copy' are done, a 'commit' operation can be done. The 'commit' done on the local device, results in the local 'effective database' being overwritten with the 'copy' and then the new local 'effective database' is distributed to all other devices in the Fibre Channel fabric. The successful 'commit' operation also results in destroying the 'copy' on the local device. The 'commit' can only be performed by the owner of the session. The 'copy' can optionally be destroyed without any distribution. This can be done by performing a 'clear' operation. Glossary of terms used in this MIB VSAN - Virtual Storage Area Network.