On some Cisco Catalyst switch platforms, such as 3550 and 6500, you can enable port security on trunk ports. On these platforms, Protect mode security is not recommended for a trunk port. Protect mode disables learning when any VLAN reaches its maximum limit, even if the port has not reached its maximum limit.

Table 14-2 shows the commands used to configure port security. switchport mode {access | trunk }

Sets the interface mode as access or trunk. An interface in the default mode of dynamic auto cannot be configured as a secure port.

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