Black Box LPB2910A, User Manual

Page: 246 / 367

Publication date: Sept, 2015
Revision A1
234
3-­‐5.2.1.2 Port
This section shows the MAC addresses secured by the Port Security module. Port Security is a module
with no direct configuration. Configuration comes indirectly from other modules—the user modules.
When a user module has enabled port security on a port, the port is set up for software-­‐based
learning. In this mode, frames from unknown MAC addresses are passed on to the port security
module, which in turn asks all user modules whether to allow this new MAC address to forward or
block it. For a MAC address to be set in the forwarding state, all enabled user modules must
unanimously agree on allowing the MAC address to forward. If only one chooses to block it, it will be
blocked until that user module decides otherwise.
Web Interface
To configure a Port Security Switch Status Configuration in the web interface:
1.
Click Security, Network, Port Security, and then Port.
2.
Specify the Port that you want to monitor.
3.
Check “Auto-­‐refresh”.
4. Click “Refresh“ to refresh the port detailed statistics.
Figure 3-­‐5.2.1.2: The Port Security Port Status
Parameter description:
 MAC Address & VLAN ID:
The MAC address and VLAN ID for this port. If no MAC addresses are learned, a single row stating
"No MAC addresses attached" is displayed.

State:
Indicates whether the corresponding MAC address is blocked or forwarding. In the blocked state, it
will not be allowed to transmit or receive traffic.

Time of Addition:
Shows the date and time when this MAC address was first seen on the port.

Age/Hold:
If at least one user module has decided to block this MAC address, it will stay in the blocked state
until the hold time (measured in seconds) expires. If all user modules have decided to allow this
MAC address to forward, and aging is enabled, the Port Security module will periodically check that
this MAC address still forwards traffic. If the age period (measured in seconds) expires and no
frames are seen, the MAC address will be removed from the MAC table. Otherwise, a new aging
period will begin.
If aging is disabled or a user module has decided to hold the MAC address indefinitely, a dash (-­‐)
will be shown.
 Buttons