HP ProCurve Secure Router 7203 dl Advanced Management And Configuration Manual page 730

IP Routing—Configuring RIP, OSPF, BGP, and PBR
Configuring BGP
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c. Permit the router to advertise the other half of the local routes to this
neighbor and specify a higher multi-exit discriminator metric for load
balancing. (Again, filter out routes that should not be advertised to
external neighbors.)
ProCurve(config)# route-map ISP1Out 30
ProCurve(config-route-map)# match ip address prefix-list LAN2
ProCurve(config-route-map)# match community Advertise
ProCurve(config-route-map)# set metric 200
7. Configure a similar outbound policy for the second neighbor. Set the
higher metric for the routes that received the lower metric in the policy
for the first neighbor.
8. Configure the inbound policy for the neighbors.
a. Apply a high local preference to half of the external routes and a lower
preference to the other routes. Also place all routes inbound from the
external neighbor in the no-export community so that the router does
not advertise them to other external neighbors. This protects your
network from becoming a thoroughfare for external traffic. (You can
clear other community attributes from the route before applying your
own.)
ProCurve(config)# route-map ISP1In 10
ProCurve(config-route-map)# match ip address prefix-list External1
ProCurve(config-route-map)# set local-preference 135
ProCurve(config-route-map)# set comm-list Clear delete
ProCurve(config-route-map)# set community no-export
ProCurve(config-route-map)# route-map ISP1In 20
ProCurve(config-route-map)# match ip address prefix-list External2
ProCurve(config-route-map)# set local-preference 125
ProCurve(config-route-map)# set comm-list Clear delete
ProCurve(config-route-map)# set community no-export
b. Configure a similar policy for the second neighbor; the router should
assign a higher local preference to the routes that it receives from this
neighbor in the second half of the Internet space.