Load Balancing - HP 7102dl - ProCurve Secure Router Configuration Manual

IP Routing—Configuring RIP, OSPF, BGP, and PBR
Configuring BGP
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15-76
The router includes the local AS number in BGP routes that it receives from
your router and advertises to another peer. Often, the ISP prohibits its routers
from advertising routes with your AS in its path to external neighbors.
The local AS should be the same number, assigned to you by the ISP, that you
configured when you enabled BGP. For example:
ProCurve(config-bgp-neighbor)# local-as 1
Always enter the AS number assigned to you by your AS; do not enter a private
AS number. If you want to prepend a private AS number to a route, you must
do so in a route map. See "Prepending Private AS Numbers for Load Balancing"
on page 15-99.
Your router should now be able to connect to the neighbor and exchange
routes with it. You should read the following sections only if you want to learn
how to configure more complicated policies.

Load Balancing

A multihomed BGP router connects to more than one ISP or more than one
ISP router. Such a router can legitimately forward external traffic through
more than one connection. Load balancing ensures that one connection is not
used to the exclusion of another. There are many ways to load balance, some
of them quite complex and outside the scope of this configuration guide. This
section will simply give you a few general tips on ways you can attempt to
distribute external traffic over:
multiple connections to the same neighbor on the same router
connections to multiple neighbors on the same router
connections to multiple neighbors on multiple routers
For more complicated strategies, you will need to configure route maps. See
"Configuring Route Maps: Creating More Complex Policies for Route
Exchange" on page 15-88.
If you want to configure outbound load balancing, then you can enable load
sharing, which allows the router to select more than one best route. See
"Configuring Load Sharing" on page 15-122.