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13-2
Cisco MDS 9000 Family Troubleshooting Guide, Release 3.x
OL-9285-05
Chapter 13 Troubleshooting IVR
Limitations and Restrictions
Transit VSANs
Follow these guidelines when configuring transit VSANs:
• Besides defining the IVR zone membership, you can choose to specify a set of transit VSANs to
provide connectivity between two edge VSANs:
–
If two edge VSANs in an IVR zone overlap, then a transit VSAN is not required (though not
prohibited) to provide connectivity.
–
If two edge VSANs in an IVR zone do not overlap, you may need one or more transit VSANs
to provide connectivity. Two edge VSANs in an IVR zone will not overlap if IVR is not enabled
on a switch that is a member of both the source and destination edge VSANs.
• Traffic between the edge VSANs traverses only the shortest IVR path.
• Transit VSAN information is common to all IVR zones. Sometimes a transit VSAN can also be an
edge VSAN in another IVR zone.
Border Switches
Always follow these guidelines when configuring border switches:
• Border switches require Cisco SAN-OS Release 1.3(1) or higher.
• A border switch must be a member of two or more VSANs.
• A border switch that facilities IVR communications must be IVR enabled.
• For redundant paths between active IVR zone members, IVR can (optionally) be enabled on
additional border switches.
• The VSAN topology configuration must be updated before a border switch is added or removed.
Limitations and Restrictions
The following limitations apply to IVR:
• IVR is not supported on the Cisco MDS 9124 Fabric Switch, the Cisco Fabric Switch for HP c-Class
BladeSystem, and the Cisco Fabric Switch for IBM BladeCenter.
• OX ID based load balancing of IVR traffic from IVR- enabled switches is not supported on
Generation1 switching modules. OX ID based load balancing of IVR traffic from a non-IVR MDS
switch should work. Generation 2 switching modules support OX ID based load balancing of IVR
traffic from IVR-enabled switches.
• You cannot configure IVR NAT and preferred Fibre Channel routes on Generation 1 module
interfaces.
• You cannot run SANTap and IVR together. IVR and SANTap both perform straddling across VSANs
and cannot be used together.
Table 13-1 describes the configuration limits for IVR. (See Appendix C, “Configuration Limits for
Cisco MDS SAN-OS Release 3.x” for complete limitations to the IVR configuration based on the Cisco
SAN-OS release.)
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