It is a protocol described in ITU-T Y.1731 used to implement carrier ethernet functionality. MEP
functionality like CC and RDI is based on this.
Optional TLVs.
A LLDP frame contains multiple TLVs
For some TLVs it is configurable if the switch shall include the TLV in the LLDP frame. These TLVs
are known as optional TLVs. If an optional TLVs is disabled the corresponding information is not
included in the LLDP frame.
OUI
OUI is the organizationally unique identifier. An OUI address is a globally unique identifier
assigned to a vendor by IEEE. You can determine which vendor a device belongs to according to
the OUI address which forms the first 24 bits of a MAC address.
P
PCP
PCP is an acronym for Priority Code Point. It is a 3-bit field storing the priority level for the
802.1Q frame. It is also known as User Priority.
PD
PD is an acronym for Powered Device. In a PoE> system the power is delivered from a PSE
(power sourcing equipment) to a remote device. The remote device is called a PD.
PHY
PHY is an abbreviation for Physical Interface Transceiver and is the device that implements the
Ethernet physical layer (IEEE-802.3).
PING
Ping is a program that sends a series of packets over a network or the Internet to a specific
computer in order to generate a response from that computer. The other computer responds
with an acknowledgment that it received the packets. Ping was created to verify whether a
specific computer on a network or the Internet exists and is connected.
Ping uses Internet Control Message Protocol (ICMP) packets. The PING Request is the packet
from the origin computer, and the PING Reply is the packet response from the target.
PoE
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