SMC Networks 6709FL2 INT - FICHE TECHNIQUE, Management Manual

Page: 43 / 142

F
ORWARDING AND
F
ILTERING
3-21
Forwarding and Filtering
This switch supports the following types of traffic filtering:
•
Multicast Filtering
– This switch can forward multicast traffic to host
devices that request to join a multicast service, and filter multicast traffic
for all other ports which do not require multicast services.
•
Static MAC Address
– Binds a physical address to a specific port and
VLAN. Traffic with a source or destination address found in the static
address table will only be passed through the specified interface.
•
Port Security
– Disables address learning for the specified port. Valid
addresses must be learned during a initial training period or statically
configured.
•
MAC Filtering
– Filters specified addresses from the switch or from a
specific VLAN.
Configuring Multicast Filtering
Multicasting is used to support real-time applications such as video
conferencing or streaming audio. A multicast server does not have to
establish a separate connection with each client. It merely broadcasts its
service to the network, and any hosts that want to receive the multicast
register with their local multicast switch/router. Although this approach
reduces the network overhead required by a multicast server, the broadcast
traffic must be carefully pruned at every multicast switch/router it passes
through to ensure that traffic is only passed on to hosts that subscribed to
this service.
This switch uses Internet Group Management Protocol (IGMP) to query
for any attached hosts that want to receive a specific multicast service. It
identifies the ports containing hosts requesting to join a service and sends
data out to those ports only. It then propagates the service request up to
any neighboring multicast switch/router to ensure that it will continue to
receive the multicast service. This procedure is also called multicast
filtering.