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<td bgcolor="#336666"><font face="Arial" size="2" color="#FFFFFF"><b>4.</b></font><b><font face="Arial" size="2" color="#FFFFFF">3</font></b></td>
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<td bgcolor="#336666" width="100%"><b>
<font face="Arial" size="2" color="#FFFFFF">DDR Configuration</font></b></td>
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<td bgcolor="#669999" height="25"><b>
<font face="Arial" size="2" color="#FFFFFF">4.3.3</font></b></td>
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<td bgcolor="#669999" height="25" width="100%"><strong>
<font face="Arial" size="2" color="#FFFFFF">Defining static routes for DDR</font></strong></td>
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<font face="Arial" size="2">To forward traffic, routers need to know
what route to use for a given destination. When a dynamic routing
protocol is used, the DDR interface will dial the remote site for
every routing update or hello message if these packets are defined as
interesting traffic. To prevent the frequent or constant activation of
the DDR link necessary to support dynamic routing protocols, configure
the necessary routes statically. </font>
<p><font face="Arial" size="2">To configure a static route for IP use
the following command:</font></p>
<blockquote>
<p><font face="Courier New" size="2">Router(config)#<b>ip route</b>
<i>net-prefix mask</i> {<i>address</i> | <i>interface</i>} [<i>distance</i>]
[<b>permanent</b>] </font></p>
</blockquote>
<p><font face="Arial" size="2">The Central router has a static route
to network 10.40.0.0 on the Home router.
<img border="0" src="../../images/1.gif" align="absmiddle" width="12" height="12"> The Home
router has two static routes defined for the two subnets on the
Central LAN. If the network attached to the Home router is a stub
network, then all non-local traffic should be sent to Central. A
default route is a better choice for the Home router in this instance.</font></p>
<blockquote>
<p><font face="Courier New" size="2">Home(config)#<b>ip route
0.0.0.0 0.0.0.0 10.1.0.2</b></font></p>
</blockquote>
<p><font face="Arial" size="2">When configuring static routes,
consider the following:</font></p>
<ul>
<li><font face="Arial" size="2">By default, a static route will take
precedence over a dynamic route because of its lower administrative
distance. Without additional configuration, a dynamic route to a
network will be ignored if a static route is present in the routing
table for the same network.</font></li>
<li><font face="Arial" size="2">To reduce the number of static route
entries, define a summarized or default static route. <br>
</font></li>
</ul>
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<TD bgcolor="#ffffff"><font FACE="Arial" SIZE="2" COLOR="#000000">
<p><font color="#808080">
<img border="0" src="../../images/links_icon.gif" width="25" height="25">
<b>Web Links</b></font></p>
</font><font FACE="Arial" SIZE="2" COLOR="#808080">
<p>Evaluating Backup Interfaces, Floating Static Routes, and Dialer Watch for DDR Backup<p>
<a target="_blank" href="http://www.cisco.com/en/US/tech/tk801/tk133/technologies_tech_note09186a008009457d.shtml">
http://www.cisco.com/en/US/tech/
tk801/tk133/technologies_tech_ note09186a008009457d.shtml</a></font></p>
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