5-15 LLDP ConfigurationWhen configuring LLDP, go to these sections for information you are interested in:z Overviewz LLDP Configuration Task Listz Performing Basic LLDP Configurationz Configuring CDP Compatibilityz Configuring LLDP Trappingz Displaying and Maintaining LLDPz LLDP Configuration ExamplesOverviewBackgroundIn a heterogeneous network, it is important that different types of network devices from differentvendors can discover one other and exchange configuration for interoperability and management sake.This calls for a standard configuration exchange platform.To address the needs, the IETF drafted the Link Layer Discovery Protocol (LLDP) in IEEE 802.1AB.The protocol operates on the data link layer to exchange device information between directlyconnected devices. With LLDP, a device sends local device information (including its major functions,management IP address, device ID, and port ID) as TLV (type, length, and value) triplets in LLDPDUsto the directly connected devices, and at the same time, stores the device information received inLLDPDUs sent from the LLDP neighbors in a standard management information base (MIB). It allowsa network management system to fast detect Layer-2 network topology change and identify what thechange is.For more information about MIBs, refer to SNMP Configuration in the System Volume.Basic ConceptsLLDP framesLLDP sends device information in LLDP data units (LLDPDUs). LLDPDUs are encapsulated inEthernet II or SNAP frames.1) Ethernet II-encapsulated LLDP frame format
