22 Introduction
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Port Mirroring
Port mirroring monitors and mirrors network traffic by forwarding copies of incoming and outgoing
packets from a monitored port to a monitoring port. Users specify which target port receives copies
of all traffic passing through a specified source port.
For more information, see "Defining Port Mirroring Sessions".
Broadcast Storm Control
Storm Control enables limiting the amount of Multicast and Broadcast frames accepted and
forwarded by the device.
When Layer 2 frames are forwarded, Broadcast and Multicast frames are flooded to all ports on the
relevant VLAN. This occupies bandwidth, and loads all nodes connected on all ports.
For more information, 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 based on a combination of the
ingress port and packet contents. Packets sharing common attributes can be grouped in the same
VLAN.
For more information, see "Configuring VLANs".
Port Based Virtual LANs (VLANs)
Port-based VLANs classify incoming packets to VLANs based on their ingress port.
For more information, see "Defining VLAN Ports Settings".
IEEE802.1V Protocol Based Virtual LANs (VLANs)
VLAN classification rules are defined on data-link layer (Layer 2) protocol identification. Protocol-
based VLANs isolate Layer 2 traffic for differing Layer 3 protocols.
For more information, 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. An important requirement
included in this standard is the ability to mark frames with a desired Class of Service (CoS) tag
value (0-7).
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