To Advertise A Route To Certain Peers Only - HP 7102dl - ProCurve Secure Router Configuration Manual

Use set commands to configure attributes you want to apply to the advertised
routes and then apply the route map to the BGP neighbor as an outbound filter.
If you do not want to set any attributes, simply apply the route map.
Placing a Route in a Community: Requesting a Neighbor to
Advertise a Route to Certain Peers Only
You can configure a route map to place a route in a BGP community. A
community groups routes into a set to which the same policy is applied. You
should define this policy. Often the policy selects the peers to which a neighbor
advertises routes in the community. However, a policy can also set certain
attributes such as a local preference or metric for routes in the community.
The neighbor that receives the route establishes the policy for the community.
Before placing a route in a community, you should contact your ISP and
discuss what options it supports for various communities. You should also
consult your organization's policies.
BGP specifies several well-defined communities, which are displayed in
Table 15-13.
Table 15-13. BGP Communities
Community
internet
local-as
no-advertise
no-export
You can place a route in a community according to any attribute in that route.
One of the most common ways of grouping routes is by network address and
prefix length, which you select in a prefix list. (See "Creating Prefix Lists:
Configuring Filters for Route Exchange" on page 15-81.)
For example, to define the community of the route to network 192.168.3.0 /24,
you would first create a prefix list as follows:
ProCurve(config)# ip prefix-list LAN seq 10 permit 192.168.3.0/24
IP Routing—Configuring RIP, OSPF, BGP, and PBR
Includes
all peers
all peers in the local AS
no peers
internal peers only
Configuring BGP
15-97