User’s Manual of NS2503-24P/2C
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4.13 MAC Limit
MAC limit allows users to set a maximum number of MAC addresses to be stored in the MAC address table. The MAC
addresses chosen to be stored in MAC address table is the result of first-come-first-save policy. Once a MAC address is stored
in the MAC address table, it stays in until it is aged out. When an “opening” is available, the switch stored the first new MAC
address it sees in that opening. All packets from MAC addresses not in the MAC address table should be blocked.
4.13.1 MAC Limit Configuration
The Layer 2 MAC Limit function can be per-port configured for security management purposes. When the port is in MAC Limit
mode, the port will be "locked" without permission of address learning. Only the incoming packets with Source MAC already
existing in the address table can be forwarded normally. User can disable the port from learning any new MAC addresses.
Figure 4-13-1:
MAC Limit
-
Configure MAC Limit Interface Screenshot
The page includes the following fields:
Object
Description
MAC Limit:
Enable
or
disable
MAC limit function for the Managed Switch.
Port Number:
Indicate port 1 to port 24.
Limit:
The maximum number of per-port MAC addresses to be learned (1-64, 0 to
disable this port's MAC limit function).
Apply:
Press this button to take affect.
Help:
Provide help information of MAC Limit function.
MAC Limit is only functioned on Fast Ethernet port, the Port-1 to Port-24.
