+A VLAN tag has the format ".N" where N is a number between 1 and 4095.
+This modifies the cable function to set up a VLAN host interface on
+the prior host interface, and skip subhost side setup. E.g. if the
+prior host interface is +example1+ and the tag is +.302+ then the VLAN
+interface would be +example1.302+. The host side setup uses _ifup $IF_
+and thus, the host needs to have a supporting configuration entry in
++/etc/network/interfaces+ for the VLAN interface.
+
+Note that it may be a good practice to keep a local +interfaces+ file
+as sibling to the subhost configuration file on the host and use a
+_source_ statement to include this into the system networking
+configuration.
+