3Com 1100 - Manual (Page 64)

64 C HAPTER 3: W ORKING W ITH THE W EB I NTERFACE
FWD Unknown VLAN Tags Enabled / Disabled / Auto
Allows you to specify whether the port forwards traffic that uses
unknown IEEE 802.1Q tags. If 802.1Q VLAN learning is disabled, you can
specify:
■
Enabled — Use this setting if the port is connected to a switch that
supports IEEE 802.1Q VLANs.
■
Disabled — Use this setting if the port is connected to an endstation,
hub, bridge, router, or a switch that does not support IEEE 802.1Q
VLANs.
If 802.1Q VLAN learning is enabled, you can specify:
■
Auto — Use this setting if you want the Switch to automatically
organize the forwarding of traffic containing unknown tags.
■
Enabled — Use this setting if the port is connected to a switch that
supports IEEE 802.1Q VLANs, and you want to override the automatic
organization of traffic containing unknown tags.
For more information about forwarding VLAN traffic that uses unknown
tags, see
“Forwarding Traffic Containing Unknown 802.1Q Tags” on
page 168 .
Port State Enabled / Disabled
Allows you to enable or disable the port (that is, turn the port on or off).
Security Enabled / Disabled
Allows you to specify whether the port uses security to guard against
unauthorized users connecting devices to your network. When security is
enabled on a port, it enters Single Address Learning Mode. In this mode,
the Switch:
■
Removes all the MAC (Ethernet) addresses stored for the port in the
Switch Database.
■
Learns the address of the first packet it receives on the port.
■
Defines the address as a permanent entry.
Once the first address is learned:
■
The port is disabled if a different address is seen on the port.
■
No other address can be learned until security is disabled or the
address is manually removed from the database.
■
The address cannot be learned on another port until security is
disabled or the address is manually removed from the database.