32
Figure 4-3-16
Unknown multicast data refers to multicast data for which no entries exist in the IGMP Snooping
forwarding table. When the switch receives such multicast traffic:
With the function of dropping unknown multicast data, the switch drops all the unknown
multicast data received.
With the function of forwarding unknown multicast data, the switch floods unknown
multicast data in the VLAN which the unknown multicast data belongs to.
4.3.11 EEE
The switch supports IEEE 802.3az Energy Efficient Ethernet (EEE) for 100Base-TX in full duplex
operation, and supports 10Base-Te for 10Base-T in full/half duplex. The Energy Efficient Ethernet
(EEE) operational mode combines the IEEE 802.3 Media Access Control (MAC) Sub-layer with a
family of Physical Layers defined to Support operation in Low Power Idle (LPI) Mode. When Low
Power Idle Mode is enabled, systems on both sides of the link can disable portions of the
functionality and save power during periods of low link utilization.
The switch EEE operational mode supports IEEE 802.3 MAC operation at 100Mbps. For 100Mbps
operation, the 100Base-TX PHY is supported. In addition, the switch supports a 10Mbps PHY with
reduced transmit amplitude requirements in EEE operational mode. This new PHY is fully
interoperable with legacy 10Base-T PHYs over 100m of Class-D (Category 5) or better cabling.
