preference (Routing Options)

 

Syntax

Hierarchy Level

Release Information

Statement introduced before Junos OS Release 7.4.

Statement introduced in Junos OS Release 9.0 for EX Series switches.

Statement introduced in Junos OS Release 11.3 for the QFX Series.

Statement introduced in Junos OS Release 12.3 for ACX Series routers.

Statement introduced in Junos OS Release 14.1X53-D20 for the OCX Series.

Description

Preference value for a static, aggregate, or generated route. You also can specify a secondary preference value, as well as color values, which are even finer-grained preference values.

You can specify a primary route preference (by including the preference statement in the configuration), and a secondary preference that is used as a tiebreaker (by including the preference2 statement). You can also mark route preferences with additional route tiebreaker information by specifying a color and a tiebreaker color (by including the color and color2 statements in the configuration).

If the Junos OS routing table contains a dynamic route to a destination that has a better (lower) preference value than the static, aggregate, or generated route, the dynamic route is chosen as the active route and is installed in the forwarding table.

Options

metric_value—The metric value for an aggregate, a generated, or a static route to determine the best route among multiple routes to a destination

Range: 0 through 4,294,967,295 (232 – 1)

Default: 5 (for static routes), 130 (for aggregate and generated routes)

type metric_type—(Optional) External metric type for routes exported by OSPF. When routes are exported to OSPF, type 1 routes are advertised in type 1 externals, and routes of any other type are advertised in type 2 externals. Note that if a qualified-next-hop metric value is configured, this value overrides the route metric.

Range: 1 through 16

Required Privilege Level

routing—To view this statement in the configuration.

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