About IVR NAT
Without Network Address Translation (NAT), IVR requires unique domain IDs for all switches in the fabric. You can enable IVR NAT to allow non-unique domain IDs. This feature simplifies the deployment of IVR in an existing fabric where non-unique domain IDs might be present.
By default, IVR NAT and IVR configuration distribution are disabled in all switches in the Cisco MDS 9000 Family.
Following are requirements and guidelines for using IVR NAT:
- IVR NAT port login (PLOGI) requests received from hosts are delayed a few seconds to perform the rewrite on the FC ID address. If the host's PLOGI timeout value is set to a value less than five seconds, it may result in the PLOGI being unnecessarily aborted and the host being unable to access the target. We recommend that you configure the host bus adapter for a timeout of at least ten seconds (most HBAs default to a value of 10 or 20 seconds).
- Load balancing of IVR NAT traffic across equal cost paths from an IVR-enabled switch is not supported. However, load balancing of IVR NAT traffic over PortChannel links is supported.
- You cannot configure IVR NAT and preferred Fibre Channel routes on Generation 1 module interfaces.
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