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29-3
Cisco MDS 9000 Family Fabric Manager Configuration Guide
OL-17256-03, Cisco MDS NX-OS Release 4.x
Chapter 29 Configuring Inter-VSAN Routing
Inter-VSAN Routing
IVR Features
IVR supports the following features:
• Accesses resources across VSANs without compromising other VSAN benefits.
• Transports data traffic between specific initiators and targets on different VSANs without merging
VSANs into a single logical fabric.
• Shares valuable resources (like tape libraries) across VSANs without compromise.
• Provides efficient business continuity or disaster recovery solutions when used in conjunction with
FCIP.
• Is in compliance with Fibre Channel standards.
• Incorporates third-party switches, however, IVR-enabled VSANs may have to be configured in one
of the interop modes.
IVR Terminology
The following IVR-related terms are used in this chapter:
• Native VSAN—The VSAN to which an end device logs on is the native VSAN for that end device.
• Current VSAN—The VSAN currently being configured for IVR.
• Inter-VSAN routing zone (IVR zone)—A set of end devices that are allowed to communicate across
VSANs within their interconnected SAN fabric. This definition is based on their port world wide
names (pWWNs) and their native VSAN associations. Prior to Cisco SAN-OS Release 3.0(3), you
can configure up to 2000 IVR zones and 10,000 IVR zone members on the switches in the network.
As of Cisco SAN-OS Release 3.0(3), you can configure up to 8000 IVR zones and 20,000 IVR zone
members on the switches in the network.
• Inter-VSAN routing zone sets (IVR zone sets)—One or more IVR zones make up an IVR zone set.
You can configure up to 32 IVR zone sets on any switch in the Cisco MDS 9000 Family. Only one
IVR zone set can be active at any time.
• IVR path—An IVR path is a set of switches and Inter-Switch Links (ISLs) through which a frame
from an end device in one VSAN can reach another end device in some other VSAN. Multiple paths
can exist between two such end devices.
• IVR-enabled switch—A switch on which the IVR feature is enabled.
• Edge VSAN—A VSAN that initiates (source edge-VSAN) or terminates (destination edge-VSAN)
an IVR path. Edge VSANs may be adjacent to each other or they may be connected by one or more
transit VSANs. In Figure 29-1, VSANs 1, 2, and 3 are edge VSANs.
Note An edge VSAN for one IVR path can be a transit VSAN for another IVR path.
• Transit VSAN—A VSAN that exists along an IVR path from the source edge VSAN of that path to
the destination edge VSAN of that path. In Figure 29-1, VSAN 4 is a transit VSAN.
Note When the source and destination edge VSANs are adjacent to each other, then a transit
VSAN is not required between them.
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