Load Balancing; Balancing Loads Over Multiple Connections To The Same Neighbor: Specifying The Source For Updates - HP ProCurve Secure Router 7203 dl Advanced Management And Configuration Manual

IP Routing—Configuring RIP, OSPF, BGP, and PBR
Configuring BGP
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13-74

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 13-86.
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 13-120.
Balancing Loads over Multiple Connections to the Same Neighbor:
Specifying the Source for Updates
If you are connecting to the neighbor using T1 or E1 lines over a PPP or
Frame Relay connection, you do not need to configure load balancing. You
should instead configure Multilink PPP (MLPPP) or Multilink Frame Relay
(MLFR), protocols that automatically distribute traffic over multiple carrier
lines. (See Chapter 2: Increasing Bandwidth.)
Otherwise, you can effectively force the router to balance traffic between two
connections to the same neighbor by specifying the loopback interface as the
update source.
To configure the update source, move to the BGP neighbor configuration
mode context and enter:
Syntax: update-source <interface ID>
In this situation, you should enter:
ProCurve(config-bgp-neighbor)# update-source loopback 1