Virtual Private Routed Network Services
7210 SAS M Services Guide Page 571
Configuring VPRN Protocols - BGP
VPRN BGP parameters The autonomous system number and router ID configured in the VPRN context only applies to
that particular service.
The minimal parameters that should be configured for a VPRN BGP instance are:
• Specify an autonomous system number for the router. See Configuring Global VPRN
Parameters on page 569.
• Specify a router ID - Note that if a new or different router ID value is entered in the BGP
context, then the new values takes precedence and overwrites the VPRN-level router ID.
See Configuring Global VPRN Parameters on page 569.
• Specify a VPRN BGP peer group.
• Specify a VPRN BGP neighbor with which to peer.
• Specify a VPRN BGP peer-AS that is associated with the above peer.
VPRN BGP is administratively enabled upon creation. Minimally, to enable VPRN BGP in a
VPRN instance, you must associate an autonomous system number and router ID for the VPRN
service, create a peer group, neighbor, and associate a peer AS number. There are no default
VPRN BGP groups or neighbors. Each VPRN BGP group and neighbor must be explicitly
configured.
All parameters configured for VPRN BGP are applied to the group and are inherited by each peer,
but a group parameter can be overridden on a specific basis. VPRN BGP command hierarchy
consists of three levels:
• The global level
• The group level
• The neighbor level
For example:
CLI Syntax: config>service>vprn>bgp# (global level)
group (group level)
neighbor (neighbor level)
Note that the local-address must be explicitly configured if two systems have multiple BGP peer
sessions between them for the session to be established.
For more information about the BGP protocol, refer to the 7210 SAS OS Router configuration
Guide.
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