Industrial Managed
Ethernet Switch – EH9711
User Manual
Page
57
of
223
Figure 2.52 Webpage
to Configure Network Port Security
Table 2.33 Descriptions of Port Security Configuration
Label
Description
Factory Default
Global Configuration
Aging Enabled
If checked, secured MAC addresses are subject to aging as discussed under
Disabled
Aging Period
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 10000000 seconds 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.
3600
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).
300
Port Configuration
