Planet Networking & Communication GS-5220 Series User Manual page 324

• Hold Time
Port Configuration
The table has one row for each port and a number of columns, which are:
Object
• Port
• Mode
• Limit
• Violation Mode
User's Manual of GS-5220 LCD Series Managed Switch
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 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).
Description
The port number for 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 switch 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:
Protect: Do not allow more than Limit MAC addresses on the port, but take no
further action.
Restrict: If Limit is reached, subsequent MAC addresses on the port will be
counted and marked as violating. Such MAC addreses are removed from the
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