LevelOne GEL-2670 User Manual page 88

| Configuring the Switch
C 4
HAPTER
Configuring Security
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.
Aging Period – If Aging Enabled is checked, then the aging period is
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controlled with this parameter. If other modules are using the
underlying port security for securing MAC addresses, they may have
other requirements for the aging period. The underlying port security
will use the shortest requested aging period of all modules that use this
functionality. (Range: 10-10,000,000 seconds; Default: 3600 seconds)
Port Configuration
Port – Port identifier.
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Mode – Controls whether Limit Control is enabled on this port. Both
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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.
Limit – The maximum number of MAC addresses that can be secured
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on this port. This number cannot exceed 1024. If the limit is exceeded,
the corresponding action is taken.
The switch is "initialized" 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.
Action – If Limit is reached, the switch can take one of the following
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actions:
None: Do not allow more than the specified Limit of MAC addresses
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on the port, but take no further action.
Trap: If Limit + 1 MAC addresses is seen on the port, send an SNMP
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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 is
exceeded.
Shutdown: If Limit + 1 MAC addresses is seen on the port, shut
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down the port. This implies that all secured MAC addresses will be
removed from the port, and no new addresses 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:
Boot the switch,
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Disable and re-enable Limit Control on the port or the switch,
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Click the Reopen button.
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