Configuring Convergence Priorities for IS-IS Routes

Context

Devices allow you to configure the highest convergence priority for specific IS-IS routes so that these IS-IS routes will be converged first when a network topology changes.

The rules of applying convergence priorities for IS-IS routes are as follows:

Existing IS-IS routes are converged based on the priorities configured in the prefix-priority command.
New IS-IS routes are converged based on the priorities configured in the prefix-priority command.
If an IS-IS route conforms to the matching rules of multiple convergence priorities, the highest convergence priority is used.
The convergence priority of a Level-1 IS-IS route is higher than that of a Level-2 IS-IS route.

Procedure

Run system-view
The system view is displayed.
Run isis [ process-id ]
The IS-IS view is displayed.
Run prefix-priority [ level-1 | level-2 ] { critical | high | medium } { ip-prefix prefix-name | tag tag-value }
Convergence priorities are set for IS-IS routes.

By default, the convergence priority of 32-bit host routes is medium, and the convergence priority of the other IS-IS routes is low.

The prefix-priority command is only applicable to the public network.

After the prefix-priority command is run, the convergence priority of 32-bit host routes is low, and the convergence priorities of the other routes are determined as specified in the prefix-priority command.