Assigning a convergence priority to IPv6 IS-IS routes

A topology change causes IS-IS routing convergence. To improve convergence speed, you can assign convergence priorities to IPv6 IS-IS routes. Convergence priority levels are critical, high, medium, and low. The higher the convergence priority, the faster the convergence speed.

By default, IPv6 IS-IS host routes have medium convergence priority, and other IPv6 IS-IS routes have low convergence priority.

To assign a convergence priority to specific IPv6 IS-IS routes:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enter IS-IS view.	isis [ process-id ] [ vpn-instance vpn-instance-name ]	N/A
3. Specify an IS-IS cost style.	cost-style { wide \| wide-compatible \| compatible }	By default, the IS-IS cost style is narrow.
4. Enter IPv6 address family view.	address-family ipv6 [ unicast ]	N/A
5. Enable IPv6 IS-IS MTR.	multi-topology [ compatible ]	By default, IPv6 IS-IS MTR is disabled.
6. Assign a convergence priority to specific IPv6 IS-IS routes.	Method 1:prefix-priority { critical \| high \| medium } { prefix-list prefix-list-name \| tag tag-value } Method 2: prefix-priority route-policy route-policy-name	By default, IPv6 IS-IS routes, except IPv6 IS-IS host routes, have the low convergence priority.

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