![]() The following command secures a switch by manually defining an allowed MAC address: switch(config-if)# switchport port-security mac-address 00C0.35F0.8301 Switch ports can be secured by defining one or more specific MAC addresses that should be allowed to connect, and by defining violation policies (such as disabling the port) if additional hosts try to gain a connection. By default, an unlimited number of MAC addresses can be learned on a single switch port, whether it is configured as an access port or a trunk port. Switches dynamically build MAC address tables in RAM, which allow the switch to forward incoming frames to the correct target port. ![]() Once the approved MAC addresses have all been learned, the network administrator simply saves the running-configuration file to NVRAM with the copy running-config startup-config command. 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.Issuing the switchport port-security mac-address sticky command will allow a switch to save a dynamically learned MAC address in the running-configuration of the switch, which prevents the administrator from having to document or configure specific MAC addresses. 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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