H3C Technologies H3C WX6000 Series Access Controllers - Manual (Page 348)

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LLDP Configuration
When configuring LLDP, go to these sections for information you are interested in:
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LLDP Configuration Tasks List
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Performing Basic LLDP Configuration
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Configuring LLDP Trap
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Displaying and Maintaining LLDP
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LLDP Configuration Example
The term switch in this document refers to a switch in a generic sense or an access controller
configured with the switching function unless otherwise specified.
Introduction to LLDP
Overview
Link Layer Discovery Protocol (LLDP) operates on data link layer. It stores and maintains the
information about the local device and the devices directly connected to it for network administrators to
manage networks through NMS (network management systems). In LLDP, device information is
encapsulated in LLDPDUs in the form of TLV (meaning type, length, and value) triplets and is
exchanged between directly connected devices. Information in LLDPDUs received is restored in
standard MIB (management information base).
LLDP Fundamental
LLDP operating mode
LLDP can operate in one of the following modes.
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TxRx mode. A port in this mode sends and receives LLDPDUs.
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Tx mode. A port in this mode only sends LLDPDUs.
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Rx mode. A port in this mode only receives LLDPDUs.
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Disable mode. A port in this mode does not send or receive LLDPDUs.
LLDP is initialized when an LLDP-enabled port changes to operate in another LLDP operating mode. To
prevent LLDP from being initialized too frequently, LLDP undergoes a period before being initialized on
an LLDP-enabled port when the port changes to operate in another LLDP operating mode. The period
is known as initialization delay, which is determined by the re-initialization delay timer.