Configuring Lldpmed Tlvs - AMX NXA-ENET8-2POE Operation/Reference Manual

Configuring LLDPMED TLVs

Use the LLDPMED Configuration page to set the device information which is advertised for end-point
devices.
FIG. 83 LLDPMED Configuration
LLDP-MED Configuration parameters
• Fast Start Repeat
Count
NXA-ENET8-2POE Gigabit Ethernet Layer 2 PoE Switch
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 inap-
propriate 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 adver-
tise 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 that a LLDP frame being lost during transmission between
neighbors, it is recommended to repeat the fast start transmission multiple times
to increase the possibility for that the neighbors has received the LLDP frame.
With Fast start repeat count it is possible to specify the number of times the fast
start transmission is repeated. The recommended value is 4 times, giving that 4
LLDP frames with a 1 second interval will be transmitted, when a LLDP frame with
new information is received.
Configuring the NXA-ENET8-2POE
111