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29-4
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
• Border switch—An IVR-enabled switch that is a member of two or more VSANs. Border switches,
such as the IVR-enabled switch between VSAN 1 and VSAN 4 in Figure 29-1, span two or more
different color-coded VSANs.
• Edge switch—A switch to which a member of an IVR zone has logged in. Edge switches are
unaware of the IVR configurations in the border switches. Edge switches need not be IVR enabled.
• Autonomous fabric identifier (AFID)—Allows you to configure more than one VSAN in the
network with the same VSAN ID and avoid downtime when enabling IVR between fabrics that
contain VSANs with the same ID.
IVR Limits Summary
Table 29-1 summarizes the configuration limits for IVR. See Appendix E, “Configuration Limits for
Cisco MDS SAN-OS Release 3.1(x) and 3.2(x),” for a complete list of Cisco MDS NX-OS feature
configuration limits.
Fibre Channel Header Modifications
IVR works by virtualizing the remote end devices in the native VSAN using a virtual domain. When IVR
is configured to link end devices in two disparate VSANs, the IVR border switches are responsible for
modifying the Fibre Channel headers for all communication between the end devices. The sections of
the Fibre Channel frame headers that are modified include:
• VSAN number
• Source FCID
• Destination FCID
When a frame goes from the initiator to the target, the Fibre Channel frame header is modified such that
the initiator VSAN number is changed to the target VSAN number. If IVR Network Address Translation
(NAT) is enabled, then the source and destination FCIDs are also translated at the edge border switch. If
IVR NAT is not enabled, then you must configure unique domain IDs for all switches involved in the
IVR path.
Table 29-1 IVR Configuration Limits
IVR Feature Maximum Limit
IVR zone members 20,000 IVR zone members per physical fabric as
of Cisco SAN-OS Release 3.0(3).
10,000 IVR zone members per physical fabric
prior to Cisco SAN-OS Release 3.0(3).
IVR zones 8000 IVR zones per physical fabric as of Cisco
SAN-OS Release 3.0(3).
2000 IVR zones per physical fabric prior to Cisco
SAN-OS Release 3.0(3).
IVR zone sets 32 IVR zone sets per physical fabric.
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