family route-target

Syntax

family route-target {

    advertise-default;

    external-paths number;

    prefix-limit number;

}

Hierarchy Level

[edit logical-routers logical-router-name protocols bgp group group-name],

[edit logical-routers logical-router-name protocols bgp group group-name neighbor 
address],

[edit protocols bgp group group-name],

[edit protocols bgp group group-name neighbor address]

Release Information

Statement introduced before JUNOS Release 7.4.

Description

Enable Border Gateway Protocol (BGP) route target filtering on the Layer 3 VPN.

Options

advertise-default—Cause the router to advertise the default route target route (0:0:0/0) and suppress all routes that are more specific. This can be used by a route reflector on BGP groups consisting of neighbors that act as provider edge (PE) routers only. PE routers often need to advertise all routes to the route reflector.

Suppressing all route target advertisements other that the default route reduces the amount of information exchanged between the route reflector and the PE routers. The JUNOS software further helps to reduce route target advertisement overhead by not maintaining dependency information unless a nondefault route is received.

external-paths number—Cause the router to advertise the VPN routes that reference a given route target. The number you specify with the external-paths statement determines the number of external peer routers (currently advertising that route target) that receive the VPN routes. The default value is 1.

prefix-limit number—The number of prefixes that can be received from a peer router.

Usage Guidelines

See Configuring BGP Route Target Filtering for VPNs.

Required Privilege Level

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