Link Layer Discovery Protocol (LLDP) - Overview
To support non-Cisco devices and to allow for interoperability between other devices, the Cisco NCS 4000 Series Router supports the IEEE 802.1AB LLDP. LLDP is a neighbor discovery protocol that is used for network devices to advertise information about themselves to other devices on the network. This protocol runs over the Data Link Layer, which allows two systems running different network layer protocols to learn about each other.
LLDP supports a set of attributes that it uses to learn information about neighbor devices. These attributes have a defined format known as a Type-Length-Value (TLV). LLDP supported devices can use TLVs to receive and send information to their neighbors. Details such as configuration information, device capabilities, and device identity can be advertised using this protocol.
In addition to the mandatory TLVs (Chassis ID, Port ID, and Time-to-Live), the router also supports the following basic management TLVs, which are optional:
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Port Description
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System Name
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System Description
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System Capabilities
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Management Address
These optional TLVs are automatically sent when LLDP is active, but you can disable them as needed using the lldp tlv-select disable command.