Cisco 500 series Administration Manual page 173

Smartports
Auto Smartport
Cisco 500 Series Stackable Managed Switch Administration Guide
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 switch 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 switch 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
Router
TB Bridge
SR Bridge
Switch
Host
IGMP conditional filtering
Repeater
VoIP Phone
Remotely-Managed Device
CAST Phone Port
Two-Port MAC Relay
CDP Bit Smartport Type
0x01 Router
0x02 Wireless Access Point
0x04 Ignore
0x08 Switch
0x10 Host
0x20 Ignore
0x40 Ignore
0x80 ip_phone
0x100 Ignore
0x200 Ignore
0x400 Ignore
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