Principles of MAC address learning limit on NE routers

A router learns source MAC addresses of user packets. After the number of learned MAC addresses reaches the configured limit, subsequent user packets are processed differently depending on whether the source MAC addresses of the user packets exist in the MAC address table on the router. If the source MAC addresses of the user packets are in the MAC address table, the router forwards the packets. If the source MAC addresses are not in the MAC address table, the router discards or forwards the user packets, depending on the configured action. For example, if the action is discard, the router discards the user packets on its inbound interface.

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