Planet Networking & Communication GS-6320 Series User Manual page 374

• 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-6320 and MGS-6320 Managed Switches
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 MAC table
when the hold time expires. At most Violation Limit MAC addresses can be marked
as violating at any given time.
Shutdown: If Limit is reached, one additional MAC address will cause the port to be
shut down. This implies that all secured MAC addresses be removed from the port,
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