The isis enable command enables IS-IS on an interface and specifies the IS-IS process ID to be associated with the interface.
The undo isis enable command disables IS-IS from an interface and dissociates the IS-IS process from the interface.
By default, IS-IS is not enabled on an interface.
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Usage Scenario
After an IS-IS process is configured in the system view, run the isis enable command to enable IS-IS on interfaces and associate these interfaces with the IS-IS process.
Prerequisites
An IS-IS process has been created using the isis command in the system view.
Precautions
The SR route's next hop cannot recurse to a tunnel interface. If an SRGB-enabled IS-IS process is configured on an FA tunnel interface, traffic with SR labels may be discarded.
If an IS-IS process is configured as a multi-instance process using the multi-instance enable command in the IS-IS process view, you must set the process-id parameter, which specifies the ID of the multi-instance process, when you run the undo isis enable command to disable IS-IS on the interface.