docs/en-US/security-groups-advanced-zones.xml

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<section id="security-groups-advanced-zones">
    <title>Security Groups in Advanced Zones (KVM Only)</title>
        <para>&PRODUCT; provides the ability to use security groups to provide isolation between
            guests on a single shared, zone-wide network in an advanced zone where KVM is the
            hypervisor. Using security groups in advanced zones rather than multiple VLANs allows a greater range
            of options for setting up guest isolation in a cloud.</para>
        <formalpara>
            <title>Limitations</title>
            <para>The following are not supported for this feature:</para>
        </formalpara>
        <itemizedlist>
            <listitem>
                <para>Two IP ranges with the same VLAN and different gateway or netmask in security
                    group-enabled shared network.</para>
            </listitem>
            <listitem>
                <para>Two IP ranges with the same VLAN and different gateway or netmask in
                    account-specific shared networks.</para>
            </listitem>
            <listitem>
                <para>Multiple VLAN ranges in security group-enabled shared network.</para>
            </listitem>
            <listitem>
                <para>Multiple VLAN ranges in account-specific shared networks.</para>
            </listitem>
        </itemizedlist>
        <para>Security groups must be enabled in the zone in order for this feature to be used.</para>
</section>