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Ccie certification cost Link layer discovery protocol ( LLDP)explanation(2)




Ccie certification cost Link layer discovery protocol ( LLDP)explanation(2)


LLDP is an information discovery and advertisement protocol. The LLDP entity mainly maintains two MIB libraries, a local system MIB and a remote system MIB. It can also be seen from its name that one is used to maintain local related device MIB information,Ccie certification cost. and one is used to maintain remote device MIB information.


LLDP initializes and maintains the local system MIB by interacting with several MIB libraries on the right side in the figure above, and advertises local related information. At the same time, when it receives information from other devices, it is updated to the remote system MIB. In this way, a device can advertise its own information and obtain information about other devices in the network, and finally obtain two MIB libraries that reflect the network topology and other configuration information. These two libraries can be used by their users to perform various functions
LLDP packet:

A packet encapsulated with an LLDPDU is called an LLDP packet. The encapsulation format is two types: Ethernet II and SNAP (Subnetwork Access Protocol).

LLDP packets encapsulated in Ethernet II format:



· Destination MAC address: Destination MAC address, which is a fixed multicast MAC address 0x0180-C200-000E.

· Source MAC address: The source MAC address, which is the port MAC address or device bridge MAC address (if there is a port address, the port MAC address is used, otherwise the device bridge MAC address is used).

· Type: Packet type, which is 0x88CC.

· Data: Data is LLDPDU.

· FCS: Frame check sequence.

LLDP packets encapsulated in SNAP format:



· Destination MAC address: Destination MAC address, which is a fixed multicast MAC address 0x0180-C200-000E.

· Source MAC address: The source MAC address, which is the port MAC address or device bridge MAC address (if there is a port address, the port MAC address is used, otherwise the device bridge MAC address is used).Ccie certification cost.

· Type: Packet type, which is 0xAAAA-0300-0000-88CC.

· Data: Data is LLDPDU.

· FCS: Frame check sequence.

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Ccie certification cost Link layer discovery protocol ( LLDP)explanation(2)

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