SignaMax 065-7910HPOEP, Руководство пользователя, Страница: 35 / 89

7 Forwarding
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Caution:
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The port must be a member of this VLAN.
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The port should not be a member of a trunk group.
7.1.2 Dynamic Unicast MAC
This page lists all dynamic unicast MAC addresses, including learned by the switch and
added manually. An entry can be deleted. If the time is out, it will refresh the list automatically.
The timer is 300 seconds fixedly.
7.2 Multicast MAC Address
As a technique coexisting with unicast and broadcast, the multicast technique effectively
addresses the issue of point-to-multipoint data transmission. By allowing high-efficiency
point-to-multipoint data transmission over a network, multicast greatly saves network
bandwidth and reduces network load.
With the multicast technology, a network operator can easily provide new value-added
services, such as live Webcasting, Web TV, distance learning, telemedicine, Web radio,
real-time videoconferencing, and other bandwidth- and time-critical information services.
When some hosts on the network need multicast information, the information sender, or
multicast source, sends only one copy of the information. Multicast distribution trees are built
through multicast routing protocols, and the packets are replicated only on nodes where the
trees branch.