Port Security

This guide explains  the functionality of Port Security and shows how to configure it on a Layer 2 Switch Port Interface. Furthermore, different variations of a Port Security configuration are shown.

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Introduction
Port Security
Basic Lab

Introduction

Port Security is a security feature that allows administrators to restrict access to a switch port based on the MAC address of the device connected to it. This feature can be used to prevent unauthorized devices from accessing the network by limiting the number of MAC addresses that can be learned on a specific port and by specifying which MAC addresses are allowed to connect to that port. When Port Security is enabled on a switch port, the switch can learn the MAC addresses of the devices that are connected to the port and will only allow traffic from those specific MAC addresses. If an unauthorized device attempts to connect to the port, the switch will drop the traffic from that device and can also send an SNMP trap or syslog message to notify the administrator of the security violation. There are several modes of port security that can be configured on a switch, including:

General information in short
Strict mode: Allows only a single MAC address to be learned on the port and will shut down the port if another address is detected
Relaxed mode: Allows multiple MAC addresses to be learned on the port, but will shut down the port if the maximum number of addresses is exceeded
Shutdown mode: Allows multiple MAC addresses to be learned on the port, but will shut down the port if a security violation occurs

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