Index: en_US.ISO8859-1/books/handbook/advanced-networking/chapter.xml
===================================================================
--- en_US.ISO8859-1/books/handbook/advanced-networking/chapter.xml
+++ en_US.ISO8859-1/books/handbook/advanced-networking/chapter.xml
@@ -5225,8 +5225,9 @@
     </indexterm>
 
     <para><acronym>VLANs</acronym> are a way of virtually dividing up
-      a network into many different subnetworks.  Each will have its
-      own broadcast domain and be isolated from the rest of the
+      a network into many different subnetworks, also referred
+      to as segmenting.  Each segment will have its
+      own broadcast domain and be isolated from other
       <acronym>VLANs</acronym>.</para>
 
     <para>On &os;, <acronym>VLANs</acronym> must be supported by the
@@ -5239,7 +5240,7 @@
 
     <para>To configure <acronym>VLANs</acronym> at run time, with a
       <acronym>NIC</acronym> of <literal>em0</literal> and a
-      <acronym>VLAN</acronym> tag of <systemitem>5</systemitem>.  The
+      <acronym>VLAN</acronym> tag of <systemitem>5</systemitem> the
       command would look like this:</para>
 
     <screen>&prompt.root; <userinput>ifconfig <replaceable>em0.5</replaceable> create vlan <replaceable>5</replaceable> vlandev <replaceable>em0</replaceable> inet 192.168.20.20/24</userinput></screen>
@@ -5266,5 +5267,45 @@
       <literal>vlans_<replaceable>em0</replaceable></literal>
       field and adding an additional line configuring the network on
       that <acronym>VLAN</acronym> tag's interface.</para>
+
+    <para>It is useful to assign a symbolic name to an interface so
+      that when the associated hardware is changed, only a few
+      configuration variables need to be updated.
+      For example, you might want to run security cameras over VLAN 1
+      on <literal>em0</literal>.
+      Later, if you replace the <literal>em0</literal> card with a
+      card that uses the &man.ixgb.4; driver you will not have to
+      change references to <literal>em0.1</literal> to
+      <literal>ixgb0.1</literal>.  Assigning symbolic names to
+      interfaces can also be useful to help clarify which port is
+      associated with built-in ethernet interfaces.  For example, I
+      named interfaces video and audio to associate the ports located
+      next to the video and audio connectors.  Assigning symbolic
+      names to interfaces can also ease managing a firewall
+      configuration.</para>
+
+    <para>To configure <acronym>VLAN</acronym>
+      <systemitem>5</systemitem>, on the
+      <acronym>NIC</acronym> <literal>em0</literal>, assign the
+      interface name <literal>cameras</literal>, and assign the
+      interface an IP address of <systemitem
+      class="ipaddress">192.168.20.20</systemitem> with a
+      <systemitem class="netmask">24</systemitem>-bit
+      prefix, use this command:</para>
+
+    <screen>&prompt.root; <userinput>ifconfig <replaceable>em0.5</replaceable> create vlan <replaceable>5</replaceable> vlandev <replaceable>em0</replaceable> name <replaceable>cameras</replaceable> inet <replaceable>192.168.20.20/24</replaceable></userinput></screen>
+
+    <para>To do almost the same thing, but use an interfaces that has
+      been named <literal>video</literal> use this command:</para>
+
+    <screen>&prompt.root; <userinput>ifconfig <replaceable>video.5</replaceable> create vlan <replaceable>5</replaceable> vlandev <replaceable>video</replaceable> name <replaceable>cameras inet 192.168.20.20/24</replaceable></userinput></screen>
+
+  <para>To do the last confguration at boot time, add the following
+    lines to <filename>/etc/rc.conf</filename>:</para>
+
+  <programlisting>vlans_<replaceable>video</replaceable>="<replaceable>camera</replaceable>"
+create_args_<replaceable>camera</replaceable>="vlan <replaceable>5</replaceable>"
+ifconfig_<replaceable>camera</replaceable>="inet <replaceable>192.168.20.20/24</replaceable>"</programlisting>
+
   </sect1>
 </chapter>