![]() Port security can only be configured on access ports. ![]() Also you can restict too many devices sharing connection to one of the switch ports by attaching to hubs or other dumb switches. This feauture can typically be used if your switch is in a public area where it is possible for people to pull out cables and plug in to your switch ports etc. However you should plan beforehand which ports are to be secured, how many MACs are allowed on these ports, should the MACs be static or dynamic and what action to perform if the restriction is violated. ![]() By configuring port security you can make sure that only certain MAC addresses are allowed to connect to certain switch ports and if others are detected, these ports can be shutdown. I sort of can see where your question is coming from (maybe you are asking from a troubleshooting perspective), but fundamentally we are looking at an 元 and L2 feature here.Port security is one of the methods for restricting unauthorized access to your switch ports. We clear arp on 元 devices (where the ARP entry is formed), we can clear mac on any switch (in this case where port-security is configured).Īfter a mac is cleared from the cam table, it is re-learnt when a packet with that source mac is sent. To clear the entire ARP cache on an interface, use the clear arp interface command in EXEC mode. To delete all dynamic entries from the Address Resolution Protocol ARP cache, to clear the fast-switching cache, and to clear the IP route cache, use the clear arp-cache EXEC command. The interface keyword enables you to clear all secure addresses on an interface. The address keyword enables you to clear a secure MAC addresses. To clear dynamically learned port security MAC in the CAM table, use the clear port-security dynamic command.
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