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22 Introduction
GVRP Support
GARP VLAN Registration Protocol (GVRP) provides IEEE 802.1Q-compliant VLAN pruning and
dynamic VLAN creation on 802.1Q trunk ports. When GVRP is enabled, the switch registers and
propagates VLAN membership on all ports that are part of the active spanning tree protocol topology.
For information about configuring GVRP, see "GVRP Parameters."
Protected Ports (Private VLAN Edge)
Private VLAN Edge (PVE) ports are a Layer 2 security feature that provides port-based security between
ports that are members of the same VLAN. It is an extension of the common VLAN. Traffic from
protected ports is sent only to the uplink ports and cannot be sent to other ports within the VLAN.
Subnet-based VLAN
This feature allows incoming untagged packets to be assigned to a VLAN and traffic class based on the
source IP address of the packet.
For information about configuring Subnet-based VLANs, see "Bind IP Subnet to VLAN."
MAC-based VLAN
This feature allows incoming untagged packets to be assigned to a VLAN and traffic class based on the
source MAC address of the packet.
For information about configuring MAC-based VLANs, see "Bind MAC to VLAN."
Double VLANs
The Double VLAN feature allows the use of a second tag on network traffic. The additional tag helps
differentiate between customers in the Metropolitan Area Networks (MAN) while preserving individual
customer’s VLAN identification when they enter their own 802.1Q domain.
Protocol-based VLANs
In a protocol-based VLAN, traffic is bridged through specified ports based on the VLAN’s protocol. User-
defined packet filters determine if a particular packet belongs to a particular VLAN. Protocol-based
VLANs are most often used in situations where network segments contain hosts running multiple
protocols.