Draytek VigorSwitch P2261 User Manual page 210

Port Configuration
Port
Mode
Limit
Action
202
3rd party switch or hub, which in turn is connected to a port
on this switch on which Limit Control is enabled. The
end-host will be allowed to forward if the limit is not
exceeded.
Now suppose that the end-host logs off or powers down. If
it wasn't for aging, the end-host would still take up
resources on this switch and will be allowed to forward. To
overcome this situation, enable aging. With aging enabled, a
timer is started once the end-host gets secured. When the
timer expires, the switch starts looking for frames from the
end-host, and if such frames are not seen within the next
Aging Period, the end-host is assumed to be disconnected,
and the corresponding resources are freed on the switch.
The port number to which the configuration below applies.
Controls whether Limit Control is enabled on this port. Both
this and the Global Mode must be set to Enabled for Limit
Control to be in effect. Notice that other modules may still
use the underlying port security features without enabling
Limit Control on a given port.
The maximum number of MAC addresses that can be
secured on this port. This number cannot exceed 1024. If
the limit is exceeded, the corresponding action is taken.
The stackswitch is "born" with a total number of MAC
addresses from which all ports draw whenever a new MAC
address is seen on a Port Security-enabled port. Since all
ports draw from the same pool, it may happen that a
configured maximum cannot be granted, if the remaining
ports have already used all available MAC addresses.
If Limit is reached, the switch can take one of the following
actions:
None: Do not allow more than Limit MAC addresses on the
port, but take no further action.
Trap: If Limit + 1 MAC addresses are seen on the port, send
an SNMP trap. If Aging is disabled, only one SNMP trap
will be sent, but with Aging enabled, new SNMP traps will
be sent every time the limit gets exceeded.
Shutdown: If Limit + 1 MAC addresses is seen on the port,
shut down the port. This implies that all secured MAC
addresses will be removed from the port, and no new
address will be learned. Even if the link is physically
disconnected and reconnected on the port (by disconnecting
the cable), the port will remain shut down. There are three
ways to re-open the port:
1) Boot the stack or elect a new master the switch,
2) Disable and re-enable Limit Control on the port or the
stackswitch,
3) Click the Reopen button.
Trap & Shutdown: If Limit + 1 MAC addresses is seen on
the port, both the "Trap" and the "Shutdown" actions
VigorSwitch P2261 User's Guide