Introduction 21
MAC Address Supported Features
MAC Address Capacity Support
The device supports up to eight thousand MAC addresses. The device reserves specific MAC
addresses for system use.
Self-Learning MAC Addresses
The device enables automatic MAC address learning from incoming packets. The MAC addresses
are stored in the Bridging Table.
Automatic Aging for MAC Addresses
MAC addresses from which no traffic is received for a given period are aged out. This prevents the
Bridging Table from overflowing.
For more information on configuring the MAC Address Age Out Time, see "Configuring Address
Tables".
Static MAC Entries
User defined static MAC entries are stored in the Bridging Table.
For more information, see "Configuring Address Tables".
VLAN-aware MAC-based Switching
Packets arriving from an unknown source address are sent to the microprocessor, where the source
addresses are added to the Hardware Table. Packets addressed to or from this address are more
efficiently forwarded using the Hardware Table.
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 "Multicast Forwarding Support".
Layer 2 Features
IGMP Snooping
Internet Group Membership Protocol (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".
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