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Heavy Duty Edge Switches Installation and User Guide(07/05)
57
Switching, Filtering and Forwarding
Each time a packet arrives on one of the switched ports, the decision is taken to either filter
or to forward the packet. Packets whose source and destination addresses lie on the same
port segment will be filtered, constraining them to one port and relieving the rest of the
network from processing them. A packet whose destination address is on another port
segment will be forwarded to the appropriate port, and will not be sent to the other ports
where it is not needed. Packets needed for maintaining the operation of the network (such
as occasional multi-cast packets) are forwarded to all ports. The Black Box Heavy-Duty
LBHXXX Edge Switches operate in the store-and-forward switching mode, which
eliminates bad packets and enables peak performance to be achieved when there is heavy
traffic on the network.
Switching, Address Learning
The Black Box Heavy-Duty LBHXXX units have address table capacity of
2K node addresses, and are suitable for use in large networks. They are self-learning, so
that as nodes are added or removed or moved from one segment to another, the
LBHXXX- Series switch automatically keeps up with node locations.
An address-aging algorithm causes least-used addresses to fall out in favor of
new frequently-used addresses. To reset the address buffer, cycle power down-and-up.