Configure a Route Distinguisher

Each routing instance must have a unique route distinguisher associated with it. The route distinguisher is used to place bounds around a VPN so the same IP address prefixes can be used in different VPNs without having them overlap.

We recommend that you use a unique route distinguisher for each routing instance that you configure. Although you could use the same route distinguisher on all PE routers for the same VPN, if you use a unique route distinguisher, you can determine the CE router from which a route originated.

To configure a route distinguisher, include the route-distinguisher statement:

[edit routing-instances]

routing-instance-name {

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

}

You can configure the statements at the following hierarchy levels:

• [edit routing-instances routing-instance-name]
• [edit logical-routers logical-router-name routing-instances routing-instance-name]

The route distinguisher is a 6-byte value that you can specify in one of the following formats:

• as-number:number, where as-number is your assigned AS number (a 2-byte value) and number is any 4-byte value. The AS number can be in the range of 1 through 65535.
• ip-address:number, where ip-address is an IP address in your assigned prefix range (a 4-byte value) and number is any 2-byte value. The IP address can be in the range of 0 through 4294967295 (2³² - 1).