Alcatel Speed Touch Pro User Manual page 78

6 IEEE 802.1D Transparent Bridging
Forwarding
Filtering
Isolation
Multi Protocol Bridging
Number of supported
devices
78 / 340
If an Ethernet frame arrives with a destination MAC address that is
found in the filtering database (implying it is already learned), it is
forwarded to the port that is associated with that entry.
In contrast to flooding, forwarding is more selective.
If the destination MAC address is found on the same port as the
frame arrived on, it is filtered, i.e. silently discarded.
Indeed, it makes little sense to forward the frame on this port as
the destination is directly connected to the source.
The Alcatel Multiport bridge in the
between remote ports.
i.e. Frames (including broadcasts) arriving via ADSL/ATM ports will
never be forwarded/flooded to another ADSL/ATM port.
Bridging actions are performed on MAC frames. The contents of
the MAC frame is not of importance to the bridge.
Consequently it makes no difference whether your PCs or
workstations use TCP/IP , Appletalk, IPX/SPX or any other protocol
suite.
However, some operators might embed restrictions into the
bridge. In this way only traffic that passes through the bridge filter
will be allowed on the ADSL line.
Via the dynamic learning and aging mechanism of the bridge, the
number of PCs that can be connected to either the local, or virtual
ports is theoretically unlimited.
Practically, the filtering database can hold as many as 256 entries
simultaneously.
provides isolation
3EC 17059 AAAA TCZZA Ed. 02