HP ProCurve Secure Router 7203 dl Advanced Management And Configuration Manual page 706

IP Routing—Configuring RIP, OSPF, BGP, and PBR
Configuring BGP
13-92
administrators must define policies that apply to the community, specifying,
in particular, the neighbors to which the local routers may advertise routes in
that community.
You can create such a policy by configuring a route map for each of your
router's BGP neighbors. You then match an entry in each route map to a list
of communities that the router can and cannot advertise to that neighbor.
First, create a community list as described in "Configuring a Community List"
on page 13-88.
Syntax: ip community-list <name>
For example:
ProCurve(config)# ip community-list Advertised
Then enter a deny statement for the routes that the router should not advertise
to the neighbor and a permit statement for the routes that it should. Use this
command:
Syntax: [deny | permit] [internet | local-as | no-advertise | no-export | <1-
42949672957>]
Table 13-12 shows a list of well-known communities and the policy expected
for these communities. The ProCurve Secure Router can also select privately
defined communities with values between 1 and 42929672957.
Table 13-12. Policies for BGP Communities
Community
internet
local-as
no-advertise
no-export
For example, your router connects to an external BGP neighbor. You configure
a community list to allow the router to advertise routes in the Internet
community, but to suppress advertisement of routes in the local AS. Enter
these commands:
ProCurve(config-comm-list)# permit internet
ProCurve(config-comm-list)# deny local-as no-advertise no-export
Advertise To
all peers
peers in the local AS
no peers
internal peers only