ipv6 prefix-priority (IS-IS)
Function
The ipv6 prefix-priority command sets the convergence priority for IPv6 IS-IS routes.
The undo ipv6 prefix-priority command restores the default convergence priority of IS-IS routes in an IPv6 base topology.
By default, the convergence priority of IS-IS host routes and default routes is medium, and the convergence priority of the other IS-IS routes is low.
Format
ipv6 prefix-priority [ level-1 | level-2 ] { critical | high | medium } { ipv6-prefix prefix-name | tag tag-value }
undo ipv6 prefix-priority [ level-1 | level-2 ] { critical | high | medium }
Parameters
| Parameter | Description | Value |
|---|---|---|
| level-1 | Specifies the convergence priority for IS-IS Level-1 routes. | - |
| level-2 | Specifies the convergence priority for IS-IS Level-2 routes. | - |
| critical | Sets the convergence priority of IS-IS routes to critical. | - |
| high | Sets the convergence priority of IS-IS routes to high. | - |
| medium | Sets the convergence priority of IS-IS routes to medium. | - |
| ipv6-prefix prefix-name | Specifies the name of the IPv6 prefix list used for filtering routes so that the convergence priority can be set for the IS-IS routes that match the specified IPv6 prefix list. | The name is a string of 1 to 169 case-sensitive characters, with spaces not supported. When double quotation marks are used around the string, spaces are allowed in the string. |
| tag tag-value | Specifies the tag value used for filtering routes so that the convergence priority can be set for the IS-IS routes that carry the specified tag value. To specify the tag value to filter the IPv6 routes that need to be set with the convergence priority, ensure that IS-IS routes carry the tag value. | The value is an integer ranging from 1 to 4294967295. This parameter has no default value. |
Usage Guidelines
command takes effect only in IPv6 base topologies but not in VPNs.
The convergence priorities of IS-IS routes are classified as critical, high, medium, and low in decreasing order.
The convergence priority of existing IS-IS routes is re-set according to the configuration of the ipv6 prefix-priority command.
The convergence priority of new IS-IS routes is set according to the filtering result of the ipv6 prefix-priority command.
If an IS-IS route meets the matching rules specified in multiple commands that are used to configure convergence priorities, this IS-IS route is of top convergence priority among the set convergence priorities.
If no level is specified, the convergence priority is set for both Level-1 routes and Level-2 routes according to the configuration of the ipv6 prefix-priority command.
The ipv6 prefix-priority command can take effect only after IPv6 is enabled for the IS-IS process by the ipv6 enable command.
After the ipv6 prefix-priority command is run to set the convergence priority for IS-IS routes (including IS-IS host routes and default routes), the convergence priority of all the IS-IS routes that meet the matching rules is changed according to the configuration of the ipv6 prefix-priority command, and the convergence priority of the IS-IS routes that do not meet the matching rules is changed to low.