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LLDP TLVs
The following is a brief description of the RX3i PNC LLDP TLVs.
Chassis ID TLV
The Chassis ID is always the first TLV in the LLDPDU. Chassis ID identifies the particular device on
the network. PROFINET defines two possible Chassis ID formats; each format has a different
Chassis ID subtype. The PNC generally uses the Name of Station (NOS) as the Chassis ID. If for
some reason the station name is changed to the empty string "", the internal MAC address is used
instead.
ID Subtype
7
PNIO Chassis ID
4
MAC Address
Port ID TLV
The Port ID is always the second TLV in the LLDPDU. The Port ID identifies the individual network
port on the device. PROFINET defines the Port ID as a character string.
ID Subtype
7
PPP specifies the decimal port number in the range 001 to 004. SSSSS specifies the decimal slot
number of the Controller in the range 00000 to 65535.
Time to Live TLV
Time to Live is always the third TLV in the LLDPDU. Time to Live specifies the number of seconds
that the information in this LLDPDU remains valid after delivery on the network. A Time to Live
value of 0 instructs the receiver to immediately invalidate the data in this LLDPDU and is issued
when the PNC has changed a parameter that is advertised in its LLDP.
The PNC sets the Time to Live value to 20 seconds.
End Of PDU TLV
The End Of PDU TLV is always the last TLV in the LLDPDU. This TLV carries no device
information.
PROFINET Port Status TLV
The PROFINET Port Status TLV indicates the current PROFINET status of the network port over
which this LLDP message is sent. As the PNC does not support RT Class 2 or RT Class 3, the
subfields are set to off (0x0000).
GFK-2571A
Meaning
Name of Station (character string)
Internal MAC Address of Ethernet controller
Meaning
"port-PPP-SSSSS" (length = 14 bytes)
PNIO Port ID
Chapter 7 Network Management
Value
Value
7
7-7
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