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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">4.3.6</font></b></td>
<td bgcolor="#669999"><img border="0" src="../../images/transdot.gif" width="10" height="1"></td>
<td bgcolor="#669999" height="25" width="100%"><strong>
<font face="Arial" size="2" color="#FFFFFF">Dialer profiles</font></strong></td>
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<td><font face="Arial" size="2">Legacy DDR is limited because the
configuration is applied directly to a physical interface. Since the IP
address is applied directly to the interface, then only DDR interfaces
configured in that specific subnet can establish a DDR connection with
that interface. This means that there is a one-to-one correspondence
between the two DDR interfaces at each end of the link.</font><p>
<font face="Arial" size="2">Dialer profiles remove the configuration
from the interface receiving or making calls and only bind the
configuration to the interface on a per-call basis. Dialer profiles
allow physical interfaces to dynamically take on different
characteristics based on incoming or outgoing call requirements. Dialer
profiles can do all of the following:</font></p>
<ul>
<li><font face="Arial" size="2">Define encapsulation and access
control lists </font></li>
<li><font face="Arial" size="2">Determine minimum or maximum calls</font></li>
<li><font face="Arial" size="2">Turn features on or off</font></li>
</ul>
<p><font face="Arial" size="2">Dialer profiles aid in the design and
deployment of more complex and scalable circuit-switched internetworks
by implementing a more scalable DDR model in Cisco routers and access
servers. Dialer profiles separate the logical portion of DDR, such as
the network layer, encapsulation, and dialer parameters, from the
physical interface that places or receives calls.
<img border="0" src="../../images/1.gif" align="middle" width="12" height="12"></font></p>
<p><font face="Arial" size="2">Using dialer profiles, the following
tasks may be performed:</font></p>
<ul>
<li><font face="Arial" size="2">Configure B channels of an ISDN
interface with different IP subnets.</font></li>
<li><font face="Arial" size="2">Use different encapsulations on the B
channels of an ISDN interface.</font></li>
<li><font face="Arial" size="2">Set different DDR parameters for the B
channels of an ISDN interface.</font></li>
<li><font face="Arial" size="2">Eliminate the waste of ISDN B channels
by letting ISDN BRIs belong to
multiple dialer pools.</font></li>
</ul>
<p><font face="Arial" size="2">A dialer profile consists of the
following elements:
<img border="0" src="../../images/2.gif" align="absmiddle" width="12" height="12"></font></p>
<ul>
<li><font face="Arial" size="2"><b>Dialer interface</b> � A logical
entity that uses a per-destination dialer profile.</font></li>
<li><font face="Arial" size="2"><b>Dialer pool</b> � Each dialer
interface references a dialer pool, which is a group of one or more
physical interfaces associated with a dialer profile.</font></li>
<li><font face="Arial" size="2"><b>Physical interfaces</b> �
Interfaces in a dialer pool are configured for encapsulation
parameters and to identify the dialer pools to which the interface
belongs. PPP authentication, encapsulation type, and multilink PPP are
all configured on the physical interface.
<img border="0" src="../../images/3.gif" align="absmiddle" width="12" height="12"></font></li>
</ul>
<p><font face="Arial" size="2">Like legacy DDR, dialer profiles activate
when interesting traffic is queued to be sent out a DDR interface.
First, an interesting packet is routed to a remote DDR IP address. The router
then checks the configured dialer interfaces for one that shares the
same subnet as the remote DDR IP address. If one exists, the router
looks for an unused physical DDR interface in the dialer pool. The
configuration from the dialer profile is then applied to the interface
and the router attempts to create the DDR connection. When the
connection is terminated, the interface is returned to the dialer pool
for the next call.</font></p>
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<p><font color="#808080">
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<b>Web Links</b></font></p>
</font><font FACE="Arial" SIZE="2" COLOR="#808080">
<p>Dialer Profiles<p>
<a target="_blank" href="http://www.cisco.com/en/US/tech/tk801/tk133/tk159/tech_protocol_home.html">
http://www.cisco.com/en/US/tech/
tk801/tk133/tk159/ tech_protocol_home.html</a></font></p>
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