Lantronix SISPM1040-xxxx-L3 Web User Guide
33856 Rev. A https://www.lantronix.com/ 30
System > LLDP > LLDP-MED Configuration
This page lets you configure the LLDP-MED. This function applies to VoIP devices which support LLDP-MED.
Media Endpoint Discovery is an enhancement to LLDP, known as LLDP-MED, that provides these facilities:
• Auto-discovery of LAN policies (such as VLAN, Layer 2 Priority and Differentiated services (Diffserv)
settings) enabling plug and play networking.
• Device location discovery to allow creation of location databases and, in the case of Voice over Internet
Protocol (VoIP), Enhanced 911 services.
• Inventory management, allowing network administrators to track their network devices, and determine
their characteristics (manufacturer, software and hardware versions, and serial or asset number).
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 interface. 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.
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