Port Security LAB : How to Configure Port-Security on Cisco Switch

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This Port Security Lab - How to Configure Port-Security on Cisco Switch short video tutorial will help you configure port security on Cisco Switch.

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Port Security

Switches learn MAC addresses when the frame is forwarded through a switch port. By using port security, user can limit the number of MAC addresses that can be learned to a port, set static MAC addresses and set penalties for that port if it is used by an unauthorised user. User can either use restrict, shut down or protect port-security commands.

Types of violation modes:

protect – This mode drops the packets with unknown source mac addresses until you remove enough secure mac addresses to drop below the maximum value.

restrict –This mode performs the same function as protecting, i.e drops packets until enough secure mac addresses are removed to drop below the maximum value.In addition to this, it will generate a log message, increment the counter value and will also send SNMP trap.

shut down – This mode is mostly preferred as compared to other modes as it shut down the port immediately if unauthorized access is done. It will also generate a log, increment counter value and send an SNMP trap. This port will remain in a shut down state until the administrator will perform “no shutdown” command.

Sticky – This is not a violation mode. By using sticky command, user provides static Mac address security without typing the absolute Mac address. For example, if user provides a maximum limit of 2 then the first 2 Mac addresses learned on that port will be placed in running configuration. After the 2nd learned Mac address, if 3rd user want to access then the appropriate action will be taken according to the violation mode applied.

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