You can set a predefined limit on the number of dynamic MAC addresses that can participate in the network.
After the FDB (forwarding database) reaches the MAC limit, all new source MAC addresses are blackholed at both the ingress and egress points. These dynamic blackhole entries prevent the MAC addresses from learning and responding to ICMP (Internet Control Message Protocol) and address resolution protocol (ARP) packets.
Note
Blackhole FDB entries added due to MAC security violations are removed after each FDB aging period regardless of whether the MAC addresses in question are still sending traffic. If the MAC addresses are still sending traffic, the blackhole entries will be re-added after they have been deleted.
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