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<h1 class="topictitle1">TCP/IP and OptiConnect</h1>
<div><p>OptiConnect can give you the ability to define TCP/IP connections
over an OptiConnect bus. This topic describes this feature and
how it might be used.</p>
<p>TCP/IP over OptiConnect provides another method for the routing building
blocks such as proxy ARP, unnumbered point-to-point networks, and virtual
IP interfaces. You can configure this with an OptiConnect-emulated LAN configuration
and an OptiConnect point-to-point configuration.</p>
<p>With an <span class="uicontrol">OptiConnect-emulated LAN configuration</span>,
the OptiConnect bus appears as a LAN to TCP/IP. This is simple to configure,
but the LAN OptiConnect connectivity is not automatic because it requires
Routing Information Protocol (RIP) or static routes.</p>
<p>The <span class="uicontrol">OptiConnect point-to-point configuration</span> uses
point-to-point unnumbered interfaces that are configured for each pair of
OptiConnect hosts. No new networks are created and so the LAN OptiConnect
connectivity is automatic. One advantage to this configuration is that no
additional route definitions are required. Connectivity between a host on
one network to hosts on another network is automatic. Another advantage is
that if both networks are active, data sent between iSeries™ servers flows over the OptiConnect
bus because these routes have the most specific subnet mask. If the OptiConnect
bus goes down, traffic is automatically switched to the token-ring LAN.</p>
<p><span class="uicontrol">OptiConnect point-to-point configuration using virtual IP</span> is
a variation on the unnumbered point-to-point configuration. Remember that
whenever you use unnumbered, point-to-point interfaces, each interface has
to have an associated local interface specified. This is the IP address by
which the system on the remote end of the point-to-point link will know the
local iSeries server.
This associated local interface might be the iSeries server's primary LAN interface,
as shown in the following figure. Or you can use a virtual IP interface as
the associated local interface. In this configuration, you use the OptiConnect
bus as a collection of point-to-point connections. You define an unnumbered
connection for each pair of hosts. Like the previous configuration, no additional
route definitions are required, and connectivity between a host on one network
to hosts on the other network are automatic. An advantage of this configuration
is that if either network is active, a path will exist to reach any iSeries server.</p>
<br /><img src="rzajw517.gif" alt="OptiConnect emulated LAN configuration" /><br /></div>
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<div class="parentlink"><strong>Parent topic:</strong> <a href="rzajwoptlpar.htm" title="OptiConnect can connect multiple iSeries servers by using a high-speed, fiber-optic bus. This information covers using OptiConnect with logical partitions and the advantages of using them.">Routing with OptiConnect and logical partitions</a></div>
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