The Neighbor Map gadget is used to discover devices on your network using Cisco Discovery Protocol (CDP) and Link Layer Discovery Protocol (LLDP).
Cisco Discovery Protocol (CDP)
CDP is a Layer 2 network protocol created by Cisco Systems, and is used to broadcast and collect information about Cisco devices including routers, bridges, access servers, and switches connected to a specified network device. Devices broadcast CDP announcements to a multicast destination. By default , these announcements are sent every 60 seconds through interfaces that support Subnetwork Access Protocol (SNAP) headers such as Ethernet, Frame Relay, and ATM.
Every CDP device stores the data received from other devices in a table that is held until the holdtime timer expires (default of 180 seconds). Accessing this information on each device enables you to query each host and then create a network topology map.
Link Layer Discovery Protocol (LLDP)
LLDP is a multivendor, Layer 2 protocol that gives network devices permission to broadcast their identity and device information to the rest of the local network. LLDP works similarly to CDP, but is used across a large variety of vendors instead of being limited to Cisco devices. Information obtained using LLDP is stored on the network devices in a table that can be accessed using SNMP. Accessing this information on each device enables you to discover each host and create a network topology map.
The Neighbor map gadget can use one or both of these protocols to draw a topology map of network devices connected to a specific target device or group of devices. The map displays each device and the associated interfaces used to connect to neighboring devices.
The announcements sent by each device using CDP or LLDP include a variety of information about the device. The data can include the operating system version, host name, IP address, the port identifier from which the announcement was sent, device enter and model, and more.
The CDP and LLDP information is obtained from each device using SNMP. Neighbor Map attempts to discover device credentials for any device that has not been added to Workspace Studio using the credentials database.See Add device credentials.