Smartport
Auto Smartport
181 Cisco 500 Series Stackable Managed Switch Administration Guide Release 1.3
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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
SR Bridge 0x04 Ignore
Switch 0x08 Switch
Host 0x10 Host
IGMP conditional filtering 0x20 Ignore
Repeater 0x40 Ignore
VoIP Phone 0x80 ip_phone
Remotely-Managed Device 0x100 Ignore
CAST Phone Port 0x200 Ignore
Two-Port MAC Relay 0x400 Ignore
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