HP 5120 EI Series Lan Switching Configuration Manual page 198

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 following categories:
Basic management TLVs
•
• Organizationally (IEEE 802.1 and IEEE 802.3) specific TLVs
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.
Basic management TLVs
1.
Table 23
must be included in every LLDPDU.
Table 23 Basic management TLVs
Type
Chassis ID
Port ID
Time To Live
End of LLDPDU
Port Description
System Name
System Description
System Capabilities
Management Address
IEEE 802.1 organizationally specific TLVs
2.
Table 24 IEEE 802.1 organizationally specific TLVs
Type
Port VLAN ID
Port And Protocol VLAN ID
VLAN Name
lists the basic management TLV types. Some of them are mandatory to LLDPDUs, that is,
Description
Specifies the bridge MAC address of the sending device
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. If the LLDPDU carries no
LLDP-MED TLVs, the port ID TLV carries the port name.
Specifies the life of the transmitted information on the receiving
device
Marks the end of the TLV sequence in the LLDPDU
Specifies the port description of the sending port
Specifies the assigned name of the sending device
Specifies the description of the sending device
Identifies the primary functions of the sending device and the
enabled primary functions
Specifies the management address, and the interface number and
object identifier (OID) associated with the address
Description
Specifies the port's VLAN identifier (PVID). An LLDPDU carries only one TLV of
this type.
Indicates whether the device supports protocol VLANs and, if so, what VLAN
IDs these protocols will be associated with. An LLDPDU can carry multiple
different TLVs of this type.
Specifies the textual name of any VLAN to which the port belongs. An LLDPDU
can carry multiple different TLVs of this type.
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Remarks
Mandatory
Optional