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<td bgcolor="#336666"><b><font face="Arial" size="2" color="#FFFFFF">5</font></b><font face="Arial" size="2" color="#FFFFFF"><b>.</b></font><b><font face="Arial" size="2" color="#FFFFFF">2</font></b></td>
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<td bgcolor="#336666" width="100%"><b>
<font face="Arial" size="2" color="#FFFFFF">Configuring Frame Relay</font></b></td>
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<td bgcolor="#669999" height="25"><b>
<font face="Arial" size="2" color="#FFFFFF">5.2.5</font></b></td>
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<td bgcolor="#669999" height="25" width="100%"><strong>
<font face="Arial" size="2" color="#FFFFFF">Configuring Frame Relay
subinterfaces</font></strong></td>
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<font face="Arial" size="2">The Frame Relay service provider will assign the
DLCI numbers. These numbers range from 16 to 992, and usually have only
local significance. DLCIs can have global significance in certain
circumstances. This number range will vary depending on the LMI used.</font><p>
<font face="Arial" size="2">In the figure, router A has two point-to-point
subinterfaces. The s0/0.110 subinterface connects to router B and the
s0/0.120 subinterface connects to router C. Each subinterface is on a
different subnet. To configure subinterfaces on a physical interface, the
following steps are required:</font></p>
<ul>
<li><font face="Arial" size="2">Configure Frame Relay encapsulation on the physical interface using the </font><font size="2" face="Courier New"><b>
encapsulation frame-relay</b></font><font face="Arial" size="2"> command
</font></li>
<li><font face="Arial" size="2">For each of the defined PVCs, create a
logical subinterface
<img border="0" src="../../images/1.gif" align="absmiddle" width="12" height="12"></font>
<p>
<font face="Courier New" size="2">router(config-if)#<b>interface
serial</b>
<i>number.subinterface-number</i> {<b>multipoint</b> | <b>point-to-point</b>}
<img border="0" src="../../images/2.gif" align="absmiddle" width="12" height="12"></font></li></ul>
<p><font face="Arial" size="2">To create a subinterface, use the </font>
<font face="Courier New" size="2"><b>interface serial</b></font><font face="Arial" size="2">
command. Specify the port number, followed by a period (.), and then by the
subinterface number. Usually, the subinterface number is chosen to be that
of the DLCI. This makes troubleshooting easier. The final required parameter
is stating whether the subinterface is a point-to-point or
point-to-multipoint interface. Either the </font>
<font face="Courier New" size="2"><b>multipoint</b></font><font face="Arial" size="2">
or </font>
<font face="Courier New" size="2"><b>point-to-point</b></font><font face="Arial" size="2">
keyword is required. There is no default. The following commands create the
subinterface for the PVC to router B:</font></p>
<blockquote>
<p><font face="Courier New" size="2">routerA(config-if)#<b>interface serial
<i>0/0.110</i> point-to-point</b></font></p>
</blockquote>
<p><font face="Arial" size="2">If the subinterface is configured as
</font><font face="Courier New" size="2"><b>point-to-point</b></font><font face="Arial" size="2">,
then the local DLCI for the subinterface must also be configured in order to
distinguish it from the physical interface. The DLCI is also required for </font><font face="Courier New" size="2"><b>
multipoint</b></font><font face="Arial" size="2"> subinterfaces for which
Inverse ARP is enabled. It is not required for multipoint subinterfaces
configured with static route maps. The </font><b><font face="Courier New" size="2">
frame-relay interface-dlci</font></b><font face="Arial" size="2"> command is
used to configure the local DLCI on the subinterface </font></p>
<blockquote>
<p><font face="Courier New" size="2">router(config-subif)#<b>frame-relay
interface-dlci</b>
<i>dlci-number</i>
<img border="0" src="../../images/3.gif" align="absmiddle" width="12" height="12"></font></p>
</blockquote>
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<p><font color="#808080">
<a target="main" href="../lab5_2_5/index.html">
<img border="0" src="../../images/lab_icon.gif" width="25" height="25"> <b>
Lab Activity</b></a></font></p>
</font><font FACE="Arial" SIZE="2" COLOR="#808080">
<p>Lab Exercise: Configuring Frame Relay Subinterfaces</p>
<p>In this lab, the student will configure three routers in a full-mesh Frame
Relay network.</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>Configuring Frame Relay Subinterfaces<p>
<a target="_blank" href="http://www.cisco.com/en/US/tech/tk713/tk237/technologies_configuration_example09186a008009421e.shtml">
http://www.cisco.com/en/US/ tech/tk713/tk237/technologies_configuration_
example09186a008009421e.shtml</a></font></p>
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