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LLDP-MED Configuration Parameters:
Items
Description
Fast Start Repeat
Rapid startup and Emergency Call Service Location Identification Discovery of endpoints is a
critically important aspect of VoIP systems in general. In addition, it is best to advertise only
those pieces of information which are specifically relevant to particular endpoint types
(for example only advertise the voice network policy to permitted voice-capable devices),
both in order to conserve the limited LLDPU space and to reduce security and system
integrity issues that can come with inappropriate knowledge of the network policy. With this
in mind LLDP-MED defines a LLDP-MED Fast Start interaction between the protocol and the
application layers on top of the protocol, in order to achieve these related properties.
Initially, a Network Connectivity Device will only transmit LLDP TLVs in an LLDPDU. Only after
an LLDP-MED Endpoint Device is detected, will an LLDP-MED capable Network
Connectivity Device start to advertise LLDP-MED TLVs in outgoing LLDPDUs on the
associated port. The LLDP-MED application will temporarily speed up the transmission of the
LLDPDU to start within a second, when a new LLDP-MED neighbor has been detected in
order share LLDP-MED information as fast as possible to new neighbors. Because there is a
risk of an LLDP frame being lost during transmission between neighbors, it is recommended
to repeat the fast start transmission multiple times to increase the possibility of the neighbors
receiving the LLDP frame. With Fast start repeat count it is possible to specify the
number of times the fast start transmission would be repeated.
The recommended value is 4 times, given that 4 LLDP frames with a 1 second interval will
be transmitted, when an LLDP frame with new information is received. It should be noted
that LLDP-MED and the LLDP-MED Fast Start mechanism is only intended to run on links
between LLDP-MED Network Connectivity Devices and Endpoint Devices, and as such does
not apply to links between LAN infrastructure elements, including Network Connectivity
Devices, or other types of links.
Coordinates Location
Latitude
Latitude should be normalized to within 0-90 degrees with a maximum of 4 digits. It is
possible to specify the direction to either North of the equator or South of the equator.
Longitude
Longitude should be normalized to within 0-90 degrees with a maximum of 4 digits. It is
possible to specify the direction to either East of the Prime Meridian or West of the Prime
Meridian.