4 mac table learning – PLANET MGSW-24160F User Manual
Page 272
User’s Manual of MGSW-24160F
VLAN
The VLAN ID of the entry.
MAC address
The MAC address of the entry.
Port Members
The ports that are members of the entry.
Buttons
Auto-refresh
: Check this box to enable an automatic refresh of the page at regular intervals.
: Refreshes the displayed table starting from the "Start from MAC address" and "VLAN" input fields.
: Flushes all dynamic entries.
:
Updates the table starting from the first entry in the MAC Table, i.e. the entry with the lowest VLAN ID and MAC
address.
: Updates the table, starting with the entry after the last entry currently displayed.
4.13.4 MAC Table Learning
If the learning mode for a given port is grayed out, another module is in control of the mode, so that it cannot be changed by the
user. An example of such a module is the MAC-Based Authentication under 802.1X.
Each port can do learning based upon the following settings:
Port security is a feature that allows you to configure a switch port with one or more device MAC addresses that are authorized
to access the network through that port.
When port security is enabled on a port, the Managed Switch stops learning new MAC addresses on the specified port and
when it has reached a configured maximum number. Only incoming traffic with source addresses already stored in the dynamic
or static address table will be authorized to access the network through that port. If a device with an unauthorized MAC address
attempts to use the switch port, the intrusion will be detected and the switch can automatically take action by disabling the port
and sending a trap message.
Note that you can also manually add secure addresses to the port using the Static Address Table. The selected port will stop
learning. The MAC addresses already in the address table will be retained and will not age out. Any other device that attempts to
use the port will be prevented from accessing the switch. The MAC Table Learning screen in
Figure 4-13-4
appears.
272