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<h1 class="topictitle1">Duplicate route-based load balancing</h1>
<div><p>You can learn about outbound workload balancing across multiple
interfaces.</p>
<p>You can use duplicate route-based load balancing for outbound workload
balancing across multiple interfaces. This is a connection-based solution
that has more flexibility than DNS-based load balancing, but it is not active
for local clients. The advantages of using this type of load balancing are
that it is a total iSeries™ server solution, it has more flexibility
than DNS, and it is good for applications where most of the traffic is outbound,
like HTTP and Telnet. The disadvantages to it are that it is a connection-based
solution (not a load-based solution), it is not active for local clients,
and it has no effect on inbound requests.</p>
<p>In the following example, three adapters on your system are all connected
to the same LAN segment. You have set up one of the adapters as an inbound
line only and set up the other two adapters as outbound. Local clients continue
to work the same way as in the past. That is to say the outbound interface
is the same as the inbound interface. Remember that a local client is any
system that does not require a router to reach it. This can be a very large
network if switches were used rather than routers.</p>
<br /><img src="rzajw511.gif" alt="Duplicate route-based load balancing" /><br /><div class="section"><h4 class="sectiontitle">Where do I go to configure this?</h4><p>You can configure
this in the Add TCP/IP Route command line and also in the iSeries Navigator
interface. One is called duplicate route priority, the other is called the
preferred binding interface. If the value for duplicate route priority is
left at the default value of 5, nothing happens. If a value greater than 5
is set, then connections are distributed between routes at the same priority.
The preferred binding interface is used to bind a route to a specific interface
by IP address rather than the first one the system sees.</p>
<p>In the preceding
example, there is an "inbound" adapter (10.6.7.3) with a duplicate route priority
of 6. The other two adapters are configured with a duplicate route priority
of 8. Because the duplicate route priority on one adapter is 6, it will not
be selected for an outbound connection unless all the single route priority
interfaces of 8 are down.</p>
<p>You should put all the outbound interfaces
at the same priority. If you put some at one value and some at another value,
only the highest value interfaces will be used.</p>
<p>Notice that the DNS
is pointing to the 10.6.7.3 interface, making it the inbound interface. Even
if you decide not to use duplicate route priority, you should always define
a default route out of the system on each interface by using the preferred
binding interface parameter.</p>
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<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="rzajwloadbasics.htm" title="Workload balancing is redistributing network traffic and workload of heavily accessed machines across multiple processors, multiple interface adapters, or multiple host servers.">TCP/IP workload balancing methods</a></div>
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