Black Box LPH240A-H, Operation Manual

Page: 45 / 56

Chapter 4: Operation
724-746-5500 | blackbox.com Page 45
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 LPH240A Series 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 LPH240A Series 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 LPH240A 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.