route-distinguisher

Syntax

route-distinguisher (as-number:number | ip-address:number);

Hierarchy Level

[edit logical-systems logical-system-name routing-instances routing-instance-name],[edit routing-instances routing-instance-name]

Release Information

Statement introduced before Junos OS Release 7.4.

Description

Specify an identifier attached to a route, enabling you to distinguish to which VPN the route belongs. Each routing instance must have a unique route distinguisher associated with it. The route distinguisher is used to place bounds around a VPN so that the same IP address prefixes can be used in different VPNs without having them overlap. If the instance type is vrf, the route-distinguisher statement is required.

Options

as-number:number—as-number is an assigned AS number and number is any 2-byte for 4-byte value. The AS number can be from 1 through 4,294,967,295. If the AS number is a 2-byte value, the administrative number is a 4-byte value. If the AS number is 4-byte value, the administrative number is a 2-byte value. A route distinguisher consisting of a 4-byte AS number and a 2-byte administrative number is defined as a type 2 route distinguisher in RFC 4364 BGP/MPLS IP Virtual Private Networks.

Note: In Junos OS Release 9.1 and later, the numeric range for AS numbers is extended to provide BGP support for 4-byte AS numbers, as defined in RFC 4893, BGP Support for Four-octet AS Number Space. All releases of the Junos OS support 2-byte AS numbers. To configure a route distinguisher that includes a 4-byte AS number, append the letter “L” to the end of the number. For example, a route distinguisher with the 4-byte AS number 7,765,000 and an administrative number of 1,000 is represented as 77765000L:1000.

In Junos OS Release 9.2 and later, you can also configure a 4-byte AS number using the AS-dot notation format of two integer values joined by a period: <16-bit high-order value in decimal>.<16-bit low-order value in decimal>. For example, the 4-byte AS number of 65,546 in plain-number format is represented as 1.10 in the AS-dot notation format.

ip-address:number—ip-address is an IP address in your assigned prefix range (a 4-byte value) and number is any 2-byte value.

Required Privilege Level

routing—To view this statement in the configuration.

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