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30 Introduction
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VLAN-aware MAC-based Switching
The device always performs VLAN-aware bridging. Classic bridging(IEEE802.1D) is not
performed, where frames are forwarded based only on their destination MAC address. However, a
similar functionality can be configured for untagged frames. Frames addressed to a destination
MAC address that is not associated with any port are flooded to all ports of the relevant VLAN.
MAC Multicast Support
Multicast service is a limited broadcast service, which allows one-to-many and many-to-many
connections for information distribution. Layer 2 Multicast service is where a single frame is
addressed to a specific Multicast address, from where copies of the frame are transmitted to the
relevant ports.
For more information, see "Assigning Multicast Forward All Parameters."
Layer 2 Features
IGMP Snooping
IGMP Snooping examines IGMP frame contents, when they are forwarded by the device from work
stations to an upstream Multicast router. From the frame, the device identifies work stations
configured for Multicast sessions, and which Multicast routers are sending Multicast frames.
For more information, see "IGMP Snooping."
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."