CHAPTER 4
Creating Dynamic VSANs
This chapter includes the following sections:
• About DPVM, on page 21
• DPVM Database Distribution, on page 26
• Database Merge Guidelines, on page 29
• Displaying DPVM Configurations, on page 31
• Sample DPVM Configuration, on page 32
• Default Settings, on page 35
About DPVM
Port VSAN membership on the switch is assigned on a port-by-port basis. By default each port belongs to
the default VSAN.
You can dynamically assign VSAN membership to ports by assigning VSANs based on the device WWN.
This method is referred to as Dynamic Port VSAN Membership (DPVM). DPVM offers flexibility and
eliminates the need to reconfigure the port VSAN membership to maintain fabric topology when a host or
storage device connection is moved between two Cisco MDS switches or two ports within a switch. It retains
the configured VSAN regardless of where a device is connected or moved. To assign VSANs statically, see
Creating Dynamic VSANs, on page 21
DPVM configurations are based on port world wide name (pWWN) and node world wide name (nWWN)
assignments. A DPVM database contains mapping information for each device pWWN/nWWN assignment
and the corresponding VSAN. The Cisco NX-OS software checks the database during a device FLOGI and
obtains the required VSAN details.
The pWWN identifies the host or device and the nWWN identifies a node consisting of multiple devices. You
can assign any one of these identifiers or any combination of these identifiers to configure DPVM mapping.
If you assign a combination, then preference is given to the pWWN.
DPVM uses the Cisco Fabric Services (CFS) infrastructure to allow efficient database management and
distribution. DPVM uses the application driven, coordinated distribution mode and the fabric-wide distribution
scope (for information about CFS, refer to the Cisco MDS 9000 Family NX-OS System Management
Configuration Guide .
Cisco MDS 9000 Series Fabric Configuration Guide, Release 8.x
21
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