When a host connects to the switch port, the port learns the host's MAC address as the first frame is received: Last Source Address:Vlan : 0000.0000.0000:0Īs you can see, there are a number of attributes which can be adjusted. Switch# show port-security interface f0/13 We can view the default port security configuration with show port-security: Switch(config-if)# switchport port-securityĪlthough only a single interface is used for illustration in this article, port security, if configured, is typically configured on all user-facing interfaces. Port security can be enabled with default parameters by issuing a single command on an interface: The addition of unmanaged devices complicates troubleshooting by administrators and is best avoided. so that two or three users can share a single access port). Its primary use is to deter the addition by users of "dumb" switches to illegally extend the reach of the network (e.g. It enables an administrator configure individual switch ports to allow only a specified number of source MAC addresses ingressing the port. Port security is a layer two traffic control feature on Cisco Catalyst switches.
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