Smartport
Auto Smartport
179 Cisco Sx350, SG350X, SG350XG, Sx550X & SG550XG Series Managed Switches, Firmware Release 2.2.5.x
10
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 if the attached device receives conflicting capabilities. 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
SR Bridge 0x04 Ignore
Switch 0x08 Switch
Host 0x10 Host
IGMP conditional filtering 0x20 Ignore
Repeater 0x40 Ignore
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