Cisco Cisco SG300-28 28-Port Gigabit Managed Switch Maintenance Manual

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Smartport
Auto Smartport
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Cisco Small Business 200, 300 and 500 Series Managed Switch Administration Guide (Internal Version) 
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There are two ways to apply a Smartport macro by Smartport type to an 
interface:
Static Smartport
You manually assign a Smartport type to an interface. The corresponding 
Smartport macro is applied to the interface. You can manually assign a 
Smartport type to an interface from the Smartport Interface Settings Page.
Auto Smartport
When a device is detected from an interface, the Smartport macro, if any, 
that corresponds to the Smartport type of the attaching device is 
automatically applied. Auto Smartport is enabled by default globally, and at 
the interface level.
In both cases, the associated anti-macro is run when the Smartport type is 
removed from the interface, and the anti-macro runs in exactly the same manner, 
removing all of the interface configuration.
Auto Smartport
In order for Auto Smartport to automatically assign Smartport types to interfaces, 
the Auto Smartport feature must be enabled globally and on the relevant 
interfaces which Auto Smartport should be allowed to configure. By default, Auto 
Smartport is enabled and allowed to configure all interfaces. The Smartport type 
assigned to each interface is determined by the CDP and LLDP packets received 
on the each interface respectively.
If multiple devices are attached to an interface, a configuration profile that is 
appropriate for all of the devices is applied to the interface if possible. 
If a device is aged out (no longer receiving advertisements from other 
devices), the interface configuration is changed according to its Persistent 
Status. If the Persistent Status is enabled, the interface configuration is 
retained. If not, the Smartport Type reverts to Default.
Enabling Auto Smartport
Auto Smartport can be enabled globally in the Properties page in the following 
ways: