3Com Switch 7750 Configuration Guide Guide

352 CHAPTER 36: BGP CONFIGURATION
■ If there already exists a peer in a peer group, you can neither change the AS
number of the peer group, nor delete a specified AS number through the
undo command.
Configuring BGP
Community
c
CAUTION:
■ When configuring BGP community, you must use a routing policy to define the
specific community attribute, and then apply the routing policy when a peer
sends routing information.
■ For configuration of routing policy, refer to "IP Routing Policy Configuration".
Configuring BGP RR
c
CAUTION:
■ Normally, full connection is not required between an RR and a client. A route is
reflected by an RR from a client to another client. If an RR and a client are fully
connected, you can disable the reflection between clients to reduce the cost.
Tabl e 285 Configure BGP community
Operation Command Description
Enter system view system-view -
Enable BGP, and enter BGP
view
bgp as-number
Required
By default, the system does
not operate BGP.
Configure the peers to
advertise community attribute
to the peer group
peer group-name
advertise-community
Required
By default, no community
attribute or extended
community attribute is
advertised to any peer group.
Specify routing policy for the
routes exported to the peer
group
peer group-name
route-policy
route-policy-name export
Required
By default, no routing policy is
specified for the routes
exported to the peer group.
Tabl e 286 Configure BGP RR
Operation Command Description
Enter system view system-view -
Enable BGP, and enter BGP
view
bgp as-number
Required
By default, the system does
not operate BGP.
Configure the local router as
the RR and configure the peer
group as the client of the RR
peer group-name
reflect-client
Required
By default, no RR and its client
is configured.
Enable route reflection
between clients
reflect between-clients
Optional
By default, route reflection is
enabled between clients.