Information About IVR Auto Topology
IVR uses a configured IVR VSAN topology to determine how to route traffic between the initiator and the target across the fabric. IVR auto topology mode automatically builds the IVR VSAN topology and maintains the topology database when fabric reconfiguration occur. IVR auto topology mode also distributes the IVR VSAN topology to IVR-enabled switches using CFS.
Using IVR auto topology mode, you do not need to manually update the IVR VSAN topology when reconfiguration occur in your fabric. If an IVR manual topology database exists, IVR auto topology mode initially uses that topology information. The automatic update reduces disruption in the network by gradually migrating from the user-specified topology database to the automatically-learned topology database. User-configured topology entries that are not part of the network are aged out in about three minutes. New entries that are not part of the user-configured database are added as they are discovered in the network.
When IVR auto topology mode is enabled, it starts with the previously active IVR manual topology if it exists, and then the discovery process begins. New, alternate, or better paths may be discovered. If the traffic is switched to an alternate or better path, there may be temporary traffic disruptions that are normally associated with switching paths.
Before configuring an IVR SAN fabric to use IVR NAT and IVR auto topology mode, consider the following:
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Configure IVR only in the relevant switches.
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Enable CFS for IVR on all switches in the fabric.
Tip |
If you change any FSPF link cost, ensure that the FSPF path distance (that is, the sum of the link costs on the path) of any IVR path is less than 30,000. |
Note |
IVR-enabled VSANs can be configured when the interop mode is enabled (any interop mode) or disabled (no interop mode). |
IVR Network Address Translation
IVR Network Address Translation (NAT) can be enabled to allow non-unique domain IDs; however, without NAT, IVR requires unique domain IDs for all switches in the fabric. IVR NAT simplifies the deployment of IVR in an existing fabric where non-unique domain IDs might be present.
To use IVR NAT, you must enable it on all IVR-enabled switches in the fabric.