The
device
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
device
or controller. The
device
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
device
, which opens a server port. When the MSE connects to the
device
there are a set of message exchanges to establish version compatibility and service exchange information followed by location
information synchronization. After connection, the
device
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
device
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
device
obtains the serial number and UDI through the LLDP-MED location TLV or CDP.
Depending on the device capabilities, the
device
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
device
detected the association
Depending on the device capabilities, the
device
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
device
detected the disassociation
When the
device
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
device
.
If you change a location address on the
device
, the
device
sends an NMSP location notification message that identifies the affected ports and the changed address information.