Tuesday, January 29, 2019

networking: LLDP

LLDP - Link Layer Discovery Protocol: is a vendor-neutural, standards-based protocol used to advertise and discover directly connected devices (IEEE 802.1ab).

Informed via LLDP Data Units which contain at least the three following TLV’s (type-length-value):

  • Chassis ID
  • Port ID
  • Time-to-Live (TTL)

LLDP is the standards-based protocol that allows for the discovery and communication between directly connected devices, while TLV's standardize what information can be exchanged.

Example of LLDP TLV's from a Ruckus Switch:

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