Alcatel-Lucent 7750 SR Manual page 1108

Configuring a VPRN Service with CLI
Configuring VPRN Protocols - BGP
Configuring BGP between the PE routers allows the PE routers to exchange information about
VPRN BGP parameters
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
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:
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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:
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Page 1108
context on each participating SR-Series router.
Specify an autonomous system number for the router. See
Parameters on page 1104.
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 router-level router ID.
See Configuring Global VPRN Parameters on page
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.
The global level
The group level
The neighbor level
Configuring Global VPRN
1104.
7750 SR OS Services Guide