Configuring the Route Distinguisher

Each routing instance that you configure on a PE router must have a unique route distinguisher associated with it. VPN and VPLS routing instances need a route distinguisher to help BGP to distinguish between potentially identical network layer reachability information (NLRI) messages received from different VPNs. If you configure different VPN or VPLS routing instances with the same route distinguisher, the commit fails.

To configure a route distinguisher on a PE router, include the route-distinguisher statement:

You can include the route-distinguisher statement at the following hierarchy levels:

• [edit routing-instances routing-instance-name]
• [edit logical-systems logical-system-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 an autonomous system (AS) number (a 2-byte value) and number is any 4-byte value. The AS number can be in the range 1 through 65,535. We recommend that you use an Internet Assigned Numbers Authority (IANA)-assigned, nonprivate AS number, preferably the Internet service provider’s (ISP’s) own or the customer’s own AS number.
• ip-address:number, where ip-address is an IP address (a 4-byte value) and number is any 2-byte value. The IP address can be any globally unique unicast address. We recommend that you use the address that you configure in the router-id statement, which is a nonprivate address in your assigned prefix range.

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