HP A5120 EI Series Configuration Guide

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Figure 56 LLDPDU encapsulation format
...Optional TLVChassis ID TLV Port ID TLV Time To Live TLV End of LLDPDU TLVOptional TLV
An LLDPDU can carry up to 28 types of TLVs. Mandatory TLVs include Chassis ID TLV, Port ID TLV, Time To
Live TLV, and End of LLDPDU TLV. Other TLVs are optional.
TLVs
TLVs are type, length, and value sequences that carry information elements. The type field identifies the
type of information, the length field measures the length of the information field in octets, and the value
field contains the information itself.
LLDPDU TLVs fall into the categories of basic management TLVs, organizationally (IEEE 802.1 and IEEE
802.3) specific TLVs, and LLDP-MED (media endpoint discovery) TLVs. Basic management TLVs are
essential to device management. Organizationally specific TLVs and LLDP-MED TLVs are used for
enhanced device management; they are defined by standardization or other organizations and are
optional to LLDPDUs.
1. Basic management TLVs
Table 21 lists the basic management TLV types. Some of them are mandatory to LLDPDUs, that is, must be
included in every LLDPDU.
Table 23 Basic management TLVs
Type
Description
Remarks
Chassis ID
Specifies the bridge MAC address of the sending device
Mandatory
Port ID
Specifies the ID of the sending port
If the LLDPDU carries LLDP-MED TLVs, the port ID TLV carries the
MAC address of the sending port or the bridge MAC if the port
does not have a MAC address. If the LLDPDU carries no LLDP-
MED TLVs, the port ID TLV carries the port name.
Time To Live
Specifies the life of the transmitted information on the receiving
device
End of LLDPDU
Marks the end of the TLV sequence in the LLDPDU
Port Description
Specifies the port description of the sending port
Optional
System Name
Specifies the assigned name of the sending device
System Description
Specifies the description of the sending device
System Capabilities
Identifies the primary functions of the sending device and the
enabled primary functions
Management Address
Specifies the management address, and the interface number
and OID (object identifier) associated with the address
2. IEEE 802.1 organizationally specific TLVs
Table 24 IEEE 802.1 organizationally specific TLVs
Type
Description
Port VLAN ID
Specifies the port’s VLAN identifier (PVID). An LLDPDU carries only one TLV
of this type.

HP A5120 EI Series Specifications

General

Uplink Ports	4 x SFP
Stacking	No
Management	CLI, Web, SNMP
Routing Protocols	RIP, OSPF
Power Supply	AC
MAC Address Table Size	16K
Dimensions	440 x 430 x 44 mm
Operating Temperature	0°C to 45°C
Operating Humidity	10% to 90% non-condensing
Model	HP A5120-24G EI Switch (JG234A)
VLANs	4094