Cisco 500 Series Administration Manual page 261

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Interaction with Other Features
This section describes the interaction between private VLANs and other system
features.
Features Supported on Private VLAN
The following features can only be enabled on a primary VLAN (and not on an
isolated or community VLAN), although they affect all VLANs in the private VLAN.
• IGMP snooping and MLD snooping. IGMP reports and queries are detected
on all the VLANs in the private VLAN, while the resulting Multicast entries
are only added to the primary VLAN's FDB. This is done to allow Multicast
traffic to be forwarded rather than flooded on the primary VLAN. The
isolated and community VLANs continue to flood Multicast traffic.
• DHCP snooping.
• ARP Inspection.
• IP Source Guard.
The system prevents adding or removing isolated or community VLANs to a
private VLAN, while the above features are enabled.
Features Not Supported on Private VLAN
The following features are not supported on private VLANs and on all the VLANs
comprising the private VLAN:
• Auto Voice VLAN
• Default VLAN
• DHCP Relay
• 802.1x Unauthenticated VLAN
• Guest VLAN
• IPv4 and IPv6. IPv6/IPv6 can be defined on a primary VLAN. Isolated and
community ports do not allow for IP connectivity. IP connectivity requires
traffic to pass on a primary VLAN.
Features Not Supported on Private VLAN Port Modes
The following features not supported on private VLAN port modes:
• GVRP
Cisco 500 Series Stackable Managed Switch Administration Guide
VLAN Management
Overview