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preference (IPv6 Router Advertisement)


Hierarchy Level


Specify the router preference that is communicated to IPv6 hosts through router advertisements. The preference value in the router advertisements enables IPv6 hosts to select a default router to reach a remote destination.

The preference can be configured when there are multiple devices that route to distinct sets of prefixes and where one of the devices would lead to considerably fewer redirects. You can indicate a lower preference for a new device that is not completely configured yet, so that hosts do not adopt this new device as the default device and thus avoid traffic loss.


You can specify different levels of preference depending on your requirements:


Specify a high preference for a device.


Specify a low preference for a device.


Specify a medium preference for a device. This is the default preference.

Required Privilege Level

routing—To view this statement in the configuration.

routing-control—To add this statement to the configuration.

Release Information

Statement introduced in Junos OS Release 16.1.