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Allied Telesis AT-S16 Manual

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Operations Manual
7
Bridging
Your switch operates as a transparent bridge to the Ethernet ports. As such,
it learns the source Media Access Control (MAC) addresses of all incoming
packets and ages out devices which have not been heard from for either a
user or the default-specified length of time.
The switch maintains a forwarding table with a maximum storage capacity of
2,048 MAC address (recall that 6 of these addresses are reserved by
developmental engineering). These Ethernet addresses are associated with
all of the devices that have been detected recently.
Your switch checks all incoming packets from each port for their destination
address against a Bridge Address Table. If a packet’s destination address is
not on the same network segment as the originating packet, the switch
forwards the packet to the network segment associated with that destination
address. However, if the packet’s source and destination address are on the
same network segment, known as local traffic, the packet is automatically
discarded (ignored) or filtered.
Bridge Address
Table
The switch creates and maintains a dynamic database of addresses which are
stored in a Bridge Address Table. Port information entries in the Bridge
Address Table are, in turn, used as a basis from which to compare and
examine every packet to determine its source address, segment origin and
port information.
If a packet’s MAC address is not already stored in the Bridge Address Table,
the switch adds the learned address, the associated port number and a timer
value that indicates the age of the dynamic Bridge Address Table entry.
Consequently, the switch knows the address and associated port number the
next time it sees that address. By using the information stored in the Bridge
Address Table, the switch is able to quickly forward each packet to the
correct port.
The switch learns addresses from all packets. When devices are added to the
network, removed from it, or relocated, you do not have to reconfigure your
switch. Your switch automatically learns all addresses.
An address stored in the Bridge Address Table is discarded if there is no
activity from that address after approximately five minutes. This aging
process ensures that the Bridge Address Table is not only continually
updated but only includes current entries.
Each entry which is automatically entered (a dynamic entry) includes:
❑ An Ethernet MAC address
❑ The port number of the LAN on which the address resides
❑ The age of the entry
Note that the procedure to assign a port number of the LAN for the above
address is also contained in the LAN Emulation menu (Port to ELAN
configuration screen).
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