> # Guidelines and Limitations

> iSLB configuration has the following limits:

> - The maximum number of iSLB and iSCSI initiators supported in a fabric is 2000.
> - The maximum number of iSLB and iSCSI sessions supported by an IPS port in either transparent or proxy initiator mode is 500.
> - The maximum number of iSLB initiators supported in a fabric is 2000.
> - The maximum number of iSLB sessions per IPS port in either transparent or proxy initiator mode is 500.
> - The maximum number of switches in a fabric that can have iSLB with CFS distribution enabled is four.
> - No more than 200 new iSLB initiators can be added to the pending configuration. Before adding more initiators, you must commit the configuration.
> - You cannot disable iSCSI if you have more than 200 iSLB initiators in the running configuration. Reduce the number of iSLB initiators to fewer than 200 before disabling iSCSI.
> - iSLB can be used without CFS distribution but if iSLB auto-zone feature is used, traffic is disrupted when any zoneset is activated.
> - If IVR and iSLB features are enabled in the same fabric, you should have at least one switch in the fabric where both these features are enabled. Any zoning-related configuration and activation (for normal zones, IVR zones, or iSLB zones) must be performed on this switch. Otherwise, there may be traffic disruption in the fabric.

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