Switch Operation Overview; Address Table Operation - HP ProCurve 1600M Installation Manual

Switches and hubs
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Introducing the HP ProCurve Switch 1600M and 2424M

Switch Operation Overview

Switch Operation Overview

Address Table Operation

Address Learning. As devices are connected to the switch ports, either
directly or through hubs or other switches, the MAC addresses of those
devices are learned automatically and stored in the 8000-entry address table
featured by the Switch 1600M and 2424M. The switches also identify the
number of the port on which each address is learned so they know the network
location of each device.
Forwarding, Filtering, Flooding. When the switch receives a packet, it
determines the destination address and looks for the address in the address
table. Based on the port location of that address, the switch then determines
whether to forward, filter-out, or flood the packet.
Network Moves and Changes. When devices are moved in the network,
and become connected to a different switch port, the Switch 1600M and 2424M
automatically recognize the change and update the address table with the new
port location of the device. Communication with the device is automatically
maintained, without any address table manipulation being required.
1-8
forward - if the destination address is on a different port than the one on
which the packet was received, the packet is forwarded to the destination
port and on to the destination device.
filter out - if the destination address is on the same port as the one on
which the packet was received, the packet is filtered out. The switch
thereby isolates local traffic so the rest of the network connected to the
switch does not lose bandwidth dealing with unnecessary traffic.
flood - whenever a new destination address is found in a packet received
on one switch port, the destination address will not yet be in the switch's
address table and the switch cannot know whether to forward or filter out
the packet. In this case, it sends the packet to all the other switch ports.
This is referred to as "flooding". When the destination device receives the
packet, it replies, and the switch learns the new address from the reply
packet. Then, all future packets destined for that address are forwarded
or filtered out appropriately.

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