OPTICAL SYSTEMS DESIGN
DOC ID: 10118101
OSD2512 OPERATOR MANUAL
PAGE 165
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 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.
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.
TRANSMIT TLVS
It is possible to select which LLDP-MED information that shall be transmitted to the
neighbors. When the checkbox is checked the information is included in the frame transmitted
to the neighbor.
Interface
The interface name to which the configuration applies.
Capabilities
When checked the switch's capabilities is included in LLDP-MED information transmitted.
Policies
When checked the configured policies for the interface is included in LLDP-MED information
transmitted.
