Introduction 27
For information about configuring port mirroring, see "Defining Port Mirroring Sessions."
Broadcast Storm Control
When Layer 2 frames are forwarded, broadcast and multicast frames are flooded to all ports on the
relevant VLAN. The flooding occupies bandwidth, and loads all nodes connected on all ports.
Storm control limits the amount of multicast and broadcast frames accepted and forwarded by the
switch.
For information about configuring storm control, see "Enabling Storm Control."
VLAN Supported Features
VLAN Support
VLANs are collections of switching ports that comprise a single broadcast domain. Packets are
classified as belonging to a VLAN based on either the VLAN tag or a combination of the ingress
port and packet contents. Packets sharing common attributes can be groups in the same VLAN.
For information about configuring VLANs, see "Configuring VLANs."
Port-Based VLANs
Port-based VLANs classify incoming packets to VLANs based on their ingress port.
For information about configuring VLANs, see "Configuring VLANs."
IEEE802.1V Protocol Based VLANs
VLAN classification rules are defined on data-link layer (Layer 2) protocol identification. Protocol-
based VLANs are used for isolating Layer 2 traffic for differing Layer 3 protocols.
For information about defining Protocol Based VLANs, see "Defining VLAN Protocol Groups."
Full 802.1Q VLAN Tagging Compliance
IEEE 802.1Q defines an architecture for virtual bridged LANs, the services provided in VLANs, and
the protocols and algorithms involved in the provision of these services.
This standard requires an ability to mark frames with a desired Class of Service (CoS) tag
value (0-7).
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 underlying Spanning Tree
protocol topology.
For information about configuring GVRP, see "Configuring GVRP. "