Allied Telesis AT-S62 - Manual (Page 111)

AT-S62 Management Software Menus Interface User’s Guide
Section I: Basic Operations 111
Broadcast frames are different. Broadcast frames are directed to all
nodes on the network or all nodes within a particular virtual LAN.
Broadcast packets can perform a variety of functions. For example,
some network operating systems use broadcast frames to announce
the presence of devices on a network.
The problem with broadcast frames is that too many of them traversing
a network can impact network performance. The more bandwidth
consumed by broadcast frames, the less available for unicast frames.
Should the performance of your network be impacted by heavy
broadcast traffic, you can use this parameter to limit the number of
broadcast frames forwarded by the switch ports and so limit the
number of broadcast frames on your network.
Activating this feature on a port discards all egress broadcast packets
on the port.
Filtering only occurs on egress broadcast packets — packets that a
port is transmitting. This filter is not applied to ingress broadcast
packets.
Possible settings for this parameter are:
Enabled The port discards all egress broadcast frames.
Disabled The port transmits egress broadcast frames. This is the
default setting.
3 - MDI/MDIX Crossover
You use this selection to set the wiring configuration of a twisted pair
port. This option only appears when option 4 - Negotiation, which is
used to activate and deactivate Auto-Negotiation, is set to Manual.
When selection 4 - Negotiation is set to Auto, which activates Auto-
Negotiation on a port, this option is hidden in the menu and a twisted
pair port uses auto-MDI/MDI-X to automatically set its wiring
configuration. This feature enables a port to configure itself
automatically as MDI or MDI-X when connected to an end node. This
allows you to use a straight-through twisted pair cable when
connecting any type of network device to a port on the switch.
The auto-MDI/MDI-X feature is only available when a port is using
Auto-Negotiation to set its speed and duplex mode. It is also the only
setting available when a port’s speed and duplex are set through Auto-
Negotiation.
If you set option 4 - Negotiation to Manual, which disables Auto-
Negotiation on a port, the auto-MDI/MDI-X feature is disabled as well
and this menu option appears with the two possible settings of MDI
and MDI-X. The default is MDI-X.