HP 6125G HP 6125G & 6125G/XG Blade Switches Layer 2 - LAN Switching Co - Page 205

TLVs, Basic management TLVs

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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. 1. Basic management TLVs Table 23 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 Chassis ID Port ID Time To Live End of LLDPDU Port Description System Name System Description System Capabilities Management Address Description Remarks 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. Mandatory 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 Optional Specifies the management address, and the interface number and object identifier (OID) associated with the address 2. IEEE 802.1 organizationally specific TLVs Table 24 IEEE 802.1 organizationally specific TLVs Type Port VLAN ID Port And Protocol VLAN ID VLAN Name 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. 196

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196
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.
1.
Basic management TLVs
Table 23
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. 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
object identifier (OID) 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.
Port And Protocol VLAN ID
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.
VLAN Name
Specifies the textual name of any VLAN to which the port belongs. An LLDPDU
can carry multiple different TLVs of this type.