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diff --git a/documentation/content/en/books/handbook/advanced-networking/_index.adoc b/documentation/content/en/books/handbook/advanced-networking/_index.adoc
--- a/documentation/content/en/books/handbook/advanced-networking/_index.adoc
+++ b/documentation/content/en/books/handbook/advanced-networking/_index.adoc
@@ -2406,6 +2406,17 @@
See how the interface name includes the NIC driver name and the VLAN tag, separated by a period? This is a best practice to make maintaining the VLAN configuration easy when many VLANs are present on a machine.
====
+[NOTE]
+====
+When defining VLANs, ensure that the parent network interface is also configured and enabled.
+The minimum configuration for the above example would be:
+
+[source,shell]
+....
+# ifconfig em0 up
+....
+====
+
To configure VLANs at boot time, [.filename]#/etc/rc.conf# must be updated.
To duplicate the configuration above, the following will need to be added:
@@ -2417,6 +2428,17 @@
Additional VLANs may be added, by simply adding the tag to the `vlans_em0` field and adding an additional line configuring the network on that VLAN tag's interface.
+[NOTE]
+====
+When defining VLANs in [.filename]#/etc/rc.conf#, make sure that the parent network interface is configured and enabled as well.
+The minimum configuration for the above example would be:
+
+[.programlisting]
+....
+ifconfig_em0="up"
+....
+====
+
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, security cameras need to be run over VLAN 1 on `em0`.
Later, if the `em0` card is replaced with a card that uses the man:ixgb[4] driver, all references to `em0.1` will not have to change to `ixgb0.1`.

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