Chapter
3: Web Management
LLDP - LLDP-MED
PoE Switch User Manual | 148
3.1.12.2. LLDP - LLDP-MED
This page allows you to configure the LLDP-MED. This function applies to VoIP devices
which support LLDP-MED.
Fast start repeat count
Fast start repeat count
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 an 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