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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">4.3.5</font></b></td>
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<td bgcolor="#669999" height="25" width="100%"><strong>
<font face="Arial" size="2" color="#FFFFFF">Configuring DDR dialer
information</font></strong></td>
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<td><font face="Arial" size="2">There are several steps involved in
configuring the DDR interface. PPP
is configured on the dialer interface using the same commands that
enable PPP on a serial interface. HDLC is the default encapsulation for
an ISDN interface on a Cisco router, but most networks employ PPP for
circuit-switched connections. Because of its robustness,
interoperability, and additional features such as authentication, PPP is
the data link protocol in use on the B channels of most routers. To
configure PPP on the DDR interface use the following commands:
<img border="0" src="../../images/1.gif" align="absmiddle" width="12" height="12"></font><blockquote>
<p><font face="Courier New" size="2">Home(config)#<b>username
Central password cisco </b> <br>
Home(config)#<b>interface bri0/0</b><br>
Home(config-if)#<b>encapsulation ppp </b> <br>
Home(config-if)#<b>ppp authentication chap</b><br>
Home(config-if)#<b>ip address 10.1.0.1 255.255.255.0</b></font></p>
</blockquote>
<p><font face="Arial" size="2">A dialer list specifying the interesting
traffic for this DDR interface needs to be associated with the DDR
interface. This is done using the </font>
<font face="Courier New" size="2"><b>dialer-group </b><i>group-number</i></font><font face="Arial" size="2">
command: <img border="0" src="../../images/2.gif" align="absmiddle" width="12" height="12"></font></p>
<blockquote>
<p><font face="Courier New" size="2">Home(config-if)#<b>dialer-group 1</b></font></p>
</blockquote>
<p><font face="Arial" size="2">In the command, </font>
<i><font face="Courier New" size="2">group-number</font></i><font face="Arial" size="2">
specifies the number of the dialer group to which the interface belongs.
The group number can be an integer from 1 to 10. This number must match
the </font>
<font face="Courier New" size="2"><b>dialer-list</b> <i>group-number</i></font><font face="Arial" size="2">.
Each interface can have only one dialer group. However, the same dialer
list can be assigned to multiple interfaces with the </font>
<font face="Courier New" size="2"><b>dialer-group</b></font><font face="Arial" size="2">
command.</font></p>
<p><font face="Arial" size="2">The correct dialing information for the
remote DDR interface needs to be specified. This is done using the </font>
<font face="Courier New" size="2"><b>dialer map</b></font><font face="Arial" size="2">
command. <img border="0" src="../../images/3.gif" align="absmiddle" width="12" height="12"></font></p>
<p><font face="Arial" size="2">The </font>
<font face="Courier New" size="2"><b>dialer map</b></font><font face="Arial" size="2">
command maps the remote protocol address to a telephone number. This
command is necessary to dial multiple sites.</font></p>
<blockquote>
<p><font face="Courier New" size="2">Router(config-if)#<b>dialer map</b>
<i>protocol
next-hop-address</i> [<b>name </b><i>hostname</i>] [<b>speed
56</b> |<b>
64</b>] [<b>broadcast</b>] <i>dial-string </i></font></p>
</blockquote>
<p><font face="Arial" size="2">If dialing only one site, use an
unconditional </font>
<font face="Courier New" size="2"><b>dialer string</b></font><font face="Arial" size="2">
command that always dials the one phone number regardless of the traffic
destination. This step is unique to legacy DDR. Although the information
is always required, the steps to configure destination information are
different when using dialer profiles instead of legacy DDR.</font></p>
<p><font face="Arial" size="2">The </font>
<font face="Courier New" size="2"><b>dialer idle-timeout</b> <i>seconds</i></font><font face="Arial" size="2">
command may be used to specify the number of idle seconds before a call
is disconnected. </font>
<font face="Courier New" size="2"> <i>
<img border="0" src="../../images/4.gif" align="absmiddle" width="12" height="12"></i></font><font face="Arial" size="2"> The </font>
<font face="Courier New" size="2"><i>seconds</i></font><font face="Arial" size="2">
represent the number of seconds until a call is disconnected after the
last interesting packet is sent. The default is 120.</font></p>
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<b>Web Links</b></font></p>
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<p>Configuration Examples<p>
<a target="_blank" href="http://www.cisco.com/en/US/tech/tk801/tk133/tech_configuration_examples_list.html">
http://www.cisco.com/en/US/tech/tk801/ tk133/tech_configuration_
examples_list.html</a></font></p>
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