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What the e0M interface is

Some storage system models have an interface named e0M. The e0M interface is dedicated to Data ONTAP management activities. It enables you to separate management traffic from data traffic on your storage system for security and throughput benefits.

On a storage system that has the e0M interface, the Ethernet port (indicated by a wrench icon on the rear of the chassis) is connected to an internal Ethernet switch. The internal Ethernet switch provides connectivity to the e0M interface and the remote management device, such as the SP, or the RLM. The following diagram illustrates the connections:

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When you set up a system that includes the e0M interface, the Data ONTAP setup script recommends that you use the e0M as the preferred management interface for environments that use dedicated LANs to isolate management traffic from data traffic. The setup script then prompts you to configure e0M. The e0M configuration is separate from the configuration of the remote management device. Both configurations require unique IP addresses to allow the Ethernet switch to direct traffic to either the e0M interface or the remote management device. For information about how to set up the e0M interface, see the Data ONTAP Software Setup Guide for 7-Mode.

After you set up the e0M interface, you can use it to access the storage system with the following management protocols, if they have been enabled:

The e0M is a low bandwidth interface that should be configured for management traffic only. Running data traffic over the e0M interface can cause performance degradation and routing problems. For information about blocking data transfer over the e0M interface, see the Data ONTAP Network Management Guide for 7-Mode.