Wired Location Service
The switch uses the location service feature to send location and attachment tracking information for its
connected devices to a Cisco Mobility Services Engine (MSE). The tracked device can be a wireless endpoint,
a wired endpoint, or a wired switch or controller. The switch notifies the MSE of device link up and link down
events through the Network Mobility Services Protocol (NMSP) location and attachment notifications.
The MSE starts the NMSP connection to the switch, which opens a server port. When the MSE connects to
the switch there are a set of message exchanges to establish version compatibility and service exchange
information followed by location information synchronization. After connection, the switch periodically sends
location and attachment notifications to the MSE. Any link up or link down events detected during an interval
are aggregated and sent at the end of the interval.
When the switch determines the presence or absence of a device on a link-up or link-down event, it obtains
the client-specific information such as the MAC address, IP address, and username. If the client is LLDP-MED-
or CDP-capable, the switch obtains the serial number and UDI through the LLDP-MED location TLV or
CDP.
Depending on the device capabilities, the switch obtains this client information at link up:
•
Slot and port specified in port connection
•
MAC address specified in the client MAC address
•
IP address specified in port connection
•
802.1X username if applicable
•
Device category is specified as a wired station
•
State is specified as new
•
Serial number, UDI
•
Model number
•
Time in seconds since the switch detected the association
Depending on the device capabilities, the switch obtains this client information at link down:
•
Slot and port that was disconnected
•
MAC address
•
IP address
•
802.1X username if applicable
•
Device category is specified as a wired station
•
State is specified as delete
•
Serial number, UDI
•
Time in seconds since the switch detected the disassociation
When the switch shuts down, it sends an attachment notification with the state delete and the IP address before
closing the NMSP connection to the MSE. The MSE interprets this notification as disassociation for all the
wired clients associated with the switch.
Consolidated Platform Configuration Guide, Cisco IOS Release 15.2(4)E (Catalyst 2960-X Switches)
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LLDP, LLDP-MED, and Wired Location Service Overview
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