> # Enabling Restrictions on Oversubscription Ratios

> ## Prerequisites

> - You must enable restrictions on oversubscription ratios before you can downgrade modules to a previous release.
> - Before enabling restrictions on oversubscription ratios, ensure that you have explicitly configured shared ports to out-of-service mode.

> ## Detailed Steps

> To enable restrictions on oversubscription ratios on multiple 48-port or 24-port 4-Gbps, or any 8-Gbps Fibre Channel switching modules using DCNM-SAN, follow these steps:

> 1. Choose Switches > Hardware.
> 2. Click the Module Config tab. You see the Module Config dialog box.
> 3. From the RateMode Oversubscription Limit drop-down list, select enabled for each module for which you want to enable restrictions on oversubscription ratios.
> 4. Click Apply to save the changes.

> To enable restrictions on oversubscription ratios on a single 48-port or 24-port 4-Gbps, or any 8-Gbps Fibre Channel switching module using Device Manager, follow these steps:

> 1. Right-click a module and select Configure.

> You see the Module dialog box.

> 2. Click the enabled radio button to enable restrictions on oversubscription ratios.
> 3. Click Apply to save the changes.

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