Prepending Private As Numbers For Load Balancing - HP ProCurve Secure Router 7203 dl Advanced Management And Configuration Manual

IP Routing—Configuring RIP, OSPF, BGP, and PBR
Configuring BGP
Keyword Purpose
add Use this keyword to append communities to selected routes.
internet The neighbor can advertise the route to any peer.
local-as The neighbor can advertise the route to peers in the local AS only, not to external peers or to
peers in the same confederation.
BGP confederations split large AS into smaller autonomous subsystems. Peers in separate
subsystems are technically in different local AS, but they act much like internal peers. The local-
as keyword prohibits the neighbor from advertising the network to peers in different subsystems
in the same confederation.
no-advertise The neighbor cannot advertise the network at all, not even to internal peers.
no-export The neighbor can only advertise the network to internal peers, which includes peers in the local
AS and, if configured, the local confederation.
none Use this keyword to remove a route from all communities.
<1-4294967295> Your organization can define private communities to group routes together and apply policies to
them.
<aa:nn> The aa:nn format identifies a privately-defined community by first the AS number (aa) and then
a private community number (nn).
13-96
Table 13-14. Placing a Network in a BGP Community
You can use multiple set commands to place selected routes in multiple
communities.
In order for the router to advertise routes' community attributes to the
external neighbor, you must move to the BGP neighbor configuration mode
and enter:
Syntax: send-community standard
You must also apply the route map that establishes routes' communities to the
neighbor as outbound policy. For example:
ProCurve(config-bgp-neighbor)# route-map CommunityMap out

Prepending Private AS Numbers for Load Balancing

Your router will send identical routes to all neighbors unless you configure
policies to filter and add attributes to these routes. When ISP routers receive
multiple identical routes from your organization, it is up to the ISP or ISPs to
select the connection over which they send inbound traffic to your network.