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To help for security and reduce password vulnerability, the command _service password-encryption encrypts passwords so that they cannot be displayed in plain text in a printed version or backup copy of the configuration file. The command influences how IOS saves current and future password for console, vty, enable and username/password.
Allow port security and use sticky secure MAC addresses.
Disable switchport port-security maximum, and use dynamic auto mode in the interface.
Disable port security and set the administrative mode of the interface into dynamic-auto.
Set the switchport port-security to protect, so that MAC addresses are automatically stored.
MAC addresses will be dynamically shown in the MAC forward/filter table by default. To stop unauthorized hosts from accessing the LAN Switch and populating the MAC table, port security must be enabled on the interfaces. A very useful tool when configuring security in a LAN switch is to use sticky secure MAC addresses. The keyword _sticky makes the first MAC address connected into the port to record (stick) the address as static until a determined aging time is expired. An example of the command is as follows; _Switch(config-if)#switchport port-security mac-address sticky. For more information refer to: [Odom W. - Cisco CCENT - CCNA ICND1 100-101 Official Certification Guide].
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