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

Auto Smartport

Cisco Small Business 200, 300 and 500 Series Managed Switch Administration Guide (Internal Version) 

205

 

•

Enabled—This manually enables Auto Smartport and places it into 
operation immediately.

•

Enable by Auto Voice VLAN—This enables Auto Smartport to operate if 
Auto Voice VLAN is enabled and in operation. Enable by Auto Voice VLAN is 
the default.

In addition to enabling Auto Smartport globally, you must enable Auto Smartport at 
the desired interface as well. By default, Auto Smartport is enabled at all the 
interfaces.

See 

 for more information on enabling Auto Voice VLAN

If Auto Smartport is globally enabled (in the Properties page), and at an interface 
(in the Interface Settings page), the device applies a Smartport macro to the 
interface based on the Smartport type of the attaching device. Auto Smartport 
derives the Smartport types of attaching devices based on the CDP and/or LLDP 
the devices advertise.

If, for example, an IP phone is attached to a port, it transmits CDP or LLDP packets 
that advertise its capabilities. After reception of these CDP and/or LLDP packets, 
the device derives the appropriate Smartport type for phone and applies the 
corresponding Smartport macro to the interface where the IP phone attaches.

Unless Persistent Auto Smartport is enabled on an interface, the Smartport type 
and resulting configuration applied by Auto Smartport is removed if the attaching 
device(s) ages out, links down, reboots, or conflicting capabilities are received. 
Aging out times are determined by the absence of CDP and/or LLDP 
advertisements from the device for a specified time period.

The device detects the type of device attached to the port, based on the CDP/
LLDP capabilities. 

This mapping is shown in the following tables:

Router

0x01

Router

TB Bridge

0x02

Wireless Access Point