Route Distinguishers; Route Reflector; Figure 66: Route Distinguisher - Alcatel-Lucent 7210 SAS M Service Manual

Route Distinguishers

The route distinguisher (RD) is an 8-byte value consisting of 2 major fields, the Type field and
value field. The type field determines how the value field should be interpreted. The 7210 SAS
implementation supports the three (3) type values as defined in the internet draft.
The three Type values are:
•
•
•

Route Reflector

Per RFC2547bis the use of Route Reflectors is supported in the service provider core. Multiple
sets of route reflectors can be used for different types of BGP routes, including IPv4 and VPN-
IPv4. 7210 can only be used a route reflector client. It cannot be used as a route reflector
("server").
7210-SAS M Services Guide
Type Field
(2-bytes)

Figure 66: Route Distinguisher

Type 0: Value Field — Administrator subfield (2 bytes)
The administrator field must contain an AS number (using private AS numbers is
discouraged). The Assigned field contains a number assigned by the service provider.
Type 1: Value Field — Administrator subfield (4 bytes)
The administrator field must contain an IP address (using private IP address space is
discouraged). The Assigned field contains a number assigned by the service provider.
Type 2: Value Field — Administrator subfield (4 bytes)
The administrator field must contain a 4-byte AS number (using private AS numbers is
discouraged). The Assigned field contains a number assigned by the service provider.
Virtual Private Routed Network Services
Value Field
(6-bytes)
Assigned number subfield (4 bytes)
Assigned number subfield (2 bytes)
Assigned number subfield (2 bytes)
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