Virtual Private Routed Network Services
7750 SR OS Services Guide Page 909
Configuring VPRN Protocols - BGP
VPRN BGP parameters Configuring BGP between the PE routers allows the PE routers to exchange information about
routes originating and terminating in the VPRN. The PE routers use the information to determine
which labels are used for traffic intended for remote sites.
In order to enable a VPRN BGP instance, the BGP protocol must be enabled in the
config>router>bgp context on each participating SR-Series router.
NOTE: Careful planning is essential to implement commands that can affect the behavior of
VPRN BGP global, group, and neighbor levels. Because the BGP commands are hierarchical,
analyze the values that can disable features on a particular level.
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 904.
• Specify a router ID - Note that if a new or different router ID value is entered in the BGP
context, then the new valuestakes precedence and overwrites the router-level router ID.
See Configuring Global VPRN Parameters on page 904.
• 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
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