Coordinate-based location

Coordinate-based location is based on the IETF RFC 3825 [6] standard, which specifies a Dynamic Host Configuration Protocol (DHCP) option for the coordinate-based geographic location of a client.

When you configure an Endpoint location information using the coordinate-based location, you specify the latitude, longitude, and altitude, along with resolution indicators (a measure of the accuracy of the coordinates), and the reference datum (the map used for the given coordinates).

To configure a coordinate-based location for an Endpoint device, enter a command such as the following at the Global CONFIG level of the CLI. Include zeros as a prefix after the floor level and the meters.

device(config)#lldp med location-id coordinate-based latitude 
-78.303 resolution 20 longitude 34.27 resolution 18 altitude meters 50.00 resolution 16 wgs84

Example coordinate-based location configuration

The following shows an example coordinate-based location configuration for the Sears Tower, at the following location.

103rd Floor233 South Wacker Drive, Chicago, IL 60606 

device(config)#lldp med location-id coordinate-based latitude 41.87884 resolution 18 longitude 87.63602 resolution 18 altitude floors 103.00 resolution 30 wgs84

The above configuration shows the following:

  • Latitude is 41.87884 degrees north (or 41.87884 degrees).
  • Longitude is 87.63602 degrees west (or 87.63602 degrees).
  • The latitude and longitude resolution of 18 describes a geo-location area that is latitude 41.8769531 to latitude 41.8789062 and extends from -87.6367188 to -87.6347657 degrees longitude. This is an area of approximately 373412 square feet (713.3 ft. x 523.5 ft.).
  • The location is inside a structure, on the 103rd floor.
  • The WGS 84 map was used as the basis for calculating the location.

Example coordinate-based location advertisement

The coordinate-based location advertisement will appear similar to the following on the remote device, and in the CLI display output on the RUCKUS device (show lldp local-info ). 

+ MED Location ID
    Data Format: Coordinate-based
    Latitude Resolution  : 20 bits
    Latitude Value       : -78.303 degrees
    Longitude Resolution : 18 bits
    Longitude Value      : 34.27 degrees
    Altitude Resolution  : 16 bits
    Altitude Value       : 50.00 meters
    Datum                : WGS 84
Parent topic: Defining a location id