Bgp Support - Alcatel-Lucent 7210 SAS M Service Manual

VPRN Service Overview

BGP Support

BGP is used with BGP extensions mentioned in
VPRN routing information across the service provider's network.
BGP was initially designed to distribute IPv4 routing information. Therefore, multi-protocol
extensions and the use of a VPN-IPv4 address were created to extend BGP's ability to carry
overlapping routing information. A VPN-IPv4 address is a 12-byte value consisting of the 8-byte
route distinguisher (RD) and the 4-byte IPv4 IP address prefix. The RD must be unique within the
scope of the VPRN. This allows the IP address prefixes within different VRFs to overlap.
Page 552
Routing Prerequisites on page 551
7210-SAS M Services Guide
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