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KVM over IP User Manual
Aging Period:
If Aging Enabled is checked, then the aging period is controlled with this input.
If other modules are using the underlying functionality for securing MAC
addresses, they may have other requirements to the aging period. The
underlying functionality will use the shorter requested aging period of all
modules that have aging enabled.
The Aging Period can be set to a number between 10 and 10000000seconds
with a default of 3600 seconds.
To understand why aging may be desired, consider the following scenario:
Suppose an end-host is connected to a 3rd party switch or hub, which in turn is
connected to a port on this switch on which Port Security 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.
Hold Time:
The hold time - measured in seconds - is used to determine how long a MAC
address is held in the MAC table if it has been found to violate the limit. Valid
range is between 10 and 10000000 seconds with a default of 300 seconds.
The reason for holding a violating MAC address in the MAC table is primarily
to ensure that the same MAC address doesn't give rise to continuous
notifications (if notifications on violation count is enabled).
Port Configuration
The table has one row for each port on the selected switch and a number of
columns, which are:
Port:
The port number to which the configuration below applies.
Mode:
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.
Limit:
310
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