Allied Telesis AT-S25 - Manual (Page 71)

AT-S25 Management Software User’s Guide
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Lock All Ports This security level causes the stack to stop learning new dynamic MAC
addresses. The stack forwards frames based on the dynamic MAC
addresses that it has already learned and any static MAC addresses that
the network administrator has entered. You can add more static MAC
addresses once this security level is activated.
The MAC aging time is disabled in this security level; no dynamic MAC
addresses are deleted from the MAC Address Table, even those
belonging to inactive end nodes.
Note
For background information on MAC addresses and aging time,
refer to MAC Address Overview on page 147.