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To enable port security on a specific port you use the switchport port-security command in interface configuration mode as shown below Įnter configuration commands, one per line. – Enable port-security on SW1 interface Fa0/1 and allow a maximum of 3 MAC addresses However, this lab can be completed using the Stub Lab.
#Cisco mac address security free
This command is executed in privileged mode to view the port’s current port-security associated mac addresses.ĭue to the limited feature support of the NM-16ESW, this lab CANNOT be completed using the Free CCNA Workbook GNS3 topology. Show port-security interface interfacename#/# address This command is executed in privileged mode to view the details of port-security on a particular port including status, timeout, violation type, max mac addresses and other configurable options. Show port-security interface interfacename#/# This command is executed in privileged mode to view the current status of all ports on the switch if they are participating in port-security. This command is executed in interface configuration mode and specifies the action to be taken upon a port security violation. This command is executed in interface configuration mode and sets the MAC address aging timer, which determines how long a MAC address is associated to a particular port with port-security enabled. This command is executed in interface configuration mode and enables port security on the configured port. In this lab you will familiarize yourself with the following commands Command The last port mode is “shutdown”, which places the port into “Err-Disabled” Mode once a port security violation has occurred. A Restricted port security violation will restrict all traffic and generate an SNMP trap to the SNMP Server for administrative reference. A Protected port security violation will still allow permissible traffic from authorized MAC addresses but all other traffic with unknown MAC addresses will be dropped.
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There are three different types of violation methods you can use with Port Security, the first being a protected port. Port security mac-address which can be dynamic or sticky (Discussed in the next lab), the maximum MAC addresses that can be associated with a particular port and the violation action rather it protect, restrict or shutdown the port once the max MAC address limit has been exceeded or a device does not match the configured MAC address on the port security configuration.
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There are several configuration requirements to enable port-security correctly such as port security mac address aging which sets a timeout timer which is used to determine how long a MAC address should stay associated with a particular port. one MAC for the built in phone switch, another MAC for the phone its self and the last mac for the directly connected PC. When you connect a phone to the network it will advertise three MAC addresses to the switch. Why 3? Most Networks envision a future where VoIP will be utilized on their network and when using a Cisco VoIP Solution, the Cisco VoIP Phone has a built in mini switch. Ideally, no more then three MAC addresses should be learned at any given time on a Cisco network. Port Security is essentially a layer 2 security mechanism that can limit the number of mac addresses that can be learned on a single switch port or perhaps be used as a security barrier to prevent anyone from unplugging a network device and plugging in a new device without authorization. They know if they can flood the switch with thousands of fake mac addresses then the switch will become basically a hub and all traffic will be forwarded to their machine, in this case they could sniff telnet or any other insecure protocol used in the environment to gain further access into the network.Ī way to prevent this “mac address table poisoning” vulnerability is to use a feature called “Port Security” Hackers know this and they will use this to gain access into a network.
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It’s common knowledge that when a switch reaches the maximum limit for its mac address table it starts flooding traffic out all ports like a hub.