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Smartport
Auto Smartport
164 Cisco Small Business 200, 300 and 500 Series Managed Switch Administration Guide (Internal Version)
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• 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.
NOTE 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 Voice VLAN for more information on enabling Auto Voice VLAN
Identifying Smartport Type
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.
Using CDP/LLDP Information to Identify Smartport Types
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:
CDP Capabilities Mapping to Smartport Type
Capability Name CDP Bit Smartport Type
Router 0x01 Router
TB Bridge 0x02 Wireless Access Point