Chapter 7: LAN1 and LAN2 Ports
106
Configuring PoE Negotiation with Link Layer Discovery Protocol
The feature described in this section is applicable when the access point is
powered by Power over Ethernet and the LAN1 port is connected to a
network device that supports Link Layer Discovery Protocol for Media
Endpoint Devices (LLDP-MED).
Link Layer Discovery Protocol (LLDP) and Link Layer Discovery Protocol
for Media Endpoint Devices (LLDP-MED) allow Ethernet network devices
to receive and/or transmit device-related information to directly connected
devices on the network that are also using the protocols, and to store the
information that is learned about other devices. The shared data allows
network devices to discover other devices directly connected to them as
well as advertise parts of their Layer 2 configuration to each other.
LLDP is a “one hop” protocol; LLDP information can only be sent to and
received by devices that are directly connected to each other, or
connected via a hub or repeater. Devices that are directly connected to
each other are called neighbors. Advertised information is not forwarded
on to other devices on the network because LLDP is a one-way protocol.
That is, the information transmitted in LLDP advertisements flows in one
direction only, from one device to its neighbors.
LLDP transmits information in packets called LLDP Data Units
(LLDPDUs). An LLDPDU consists of a set of Type-Length-Value elements
(TLV), each containing a particular type of information about the device or
port transmitting it.
The Extended Power Management TLV in LLDP-MED is for powered
devices like the access point. They use it to send their power requirements
to their PoE sources, which in turn, store the information or use it to adjust
the power supplied to the access point.
Here are the feature guidelines:
The access point has to be powered with PoE.
The LAN1 port has to be connected to an LLDP-MED device.
The LLDP-MED device has to be configured for the Extended
Power Management TLV.
The access point transmits the Extended Power Management TLV
only on LAN1 port.
The access point requests 18.8W in the TLV.
This feature is optional. You do not have to use it to power the
device with PoE.
To enable or disable PoE negotiation, perform the following procedure:
1. Select Settings > System from the main menu.
To Next Page
Loading...
Need help?
General
