Link Layer Discovery Protocol (Lldp) Commands - ZyXEL Communications XS3800-28 Cli Reference Manual

Link Layer Discovery Protocol
44.1 LLDP Overview
The LLDP (Link Layer Discovery Protocol) is a layer 2 protocol. It allows a network device to advertise its
identity and capabilities on the local network. It also allows the device to maintain and store information
from adjacent devices which are directly connected to the network device. This helps an administrator
discover network changes and perform necessary network reconfiguration and management. The
device information is encapsulated in the LLDPDUs (LLDP data units) in the form of TLV (Type, Length,
Value). Device information carried in the received LLDPDUs is stored in the standard MIB.
The Switch supports these basic management TLVs.
• End of LLDPDU (mandatory)
• Chassis ID (mandatory)
• Port ID (mandatory)
• Time to Live (mandatory)
• Port Description (optional)
• System Name (optional)
• System Description (optional)
• System Capabilities (optional)
• Management Address (optional)
The Switch also supports the IEEE 802.1 and IEEE 802.3 organizationally-specific TLVs.
Annex F of the LLDP specification defines the following set of IEEE 802.1 organizationally specific TLVs:
• Port VLAN ID TLV (optional)
• Port and Protocol VLAN ID TLV (optional)
Annex G of the LLDP specification defines the following set of IEEE 802.3 Organizationally Specific TLVs:
• MAC/PHY Configuration/Status TLV (optional)
• Power via MDI TLV (optional)
• Link Aggregation TLV (optional)
• Maximum Frame Size TLV (optional)
The optional TLVs are inserted between the Time To Live TLV and the End of LLDPDU TLV.
(LLDP) Commands
Ethernet Switch CLI Reference Guide
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