The Link Layer Discovery Protocol (LLDP) works by allowing network devices to exchange information about themselves and their connections with neighboring devices. When an LLDP-capable device is powered on or connected to a network, it sends out LLDP Data Units (LLDPDUs) containing information such as device type, capabilities, system name, port ID, and management addresses. These LLDPDUs are broadcasted periodically on each network port to which the device is connected.
LLDP operates by sending and receiving LLDPDUs between neighboring devices over Layer 2 (data link layer) of the OSI model. When an LLDP-capable device receives an LLDPDU from a neighboring device, it extracts the information contained within the LLDPDU and stores it in a local database or table. This information helps network administrators to identify and map out the network topology, including device relationships and connections.
CDP (Cisco Discovery Protocol) works on Cisco devices by providing similar functionality to LLDP but within Cisco-specific networks. CDP operates at Layer 2 of the OSI model and enables Cisco devices to discover and gather information about neighboring Cisco devices directly connected to the network. It sends periodic CDP advertisements containing details such as device type, IP addresses, and capabilities to neighboring Cisco devices. CDP helps network administrators manage and troubleshoot Cisco networks by providing visibility into the Cisco-specific network topology.
LLDP is a Layer 2 protocol according to the OSI model. It operates within the data link layer to facilitate the discovery and exchange of information between neighboring network devices. By operating at Layer 2, LLDP ensures compatibility and interoperability between different vendors’ networking equipment, promoting standardized communication and device discovery across heterogeneous networks.
Microsoft Link Layer Discovery Protocol (LLDP) is a network protocol developed by Microsoft that functions similarly to the industry-standard LLDP. It allows Windows-based devices and servers to discover and exchange information about neighboring network devices, including their identities, capabilities, and connections. Microsoft LLDP enhances network visibility and simplifies network management tasks in Windows environments by providing automatic discovery and mapping of network topologies.