Lldp Tlvs - GE PACSystems RX3i User Manual

7.2.3

LLDP TLVs

The following is a brief description of the RX3i PROFINET Controller LLDP TLVs.
7.2.3.1 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
PROFINET Controller 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
4
7.2.3.2 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
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.
7.2.3.3 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 PROFINET Controller has
changed a parameter that is advertised in its LLDP.
The PROFINET Controller sets the Time to Live value to 20 seconds.
7.2.3.4 End of PDU TLV
The End of PDU TLV is always the last TLV in the LLDPDU. This TLV carries no device information.
7.2.3.5 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. Since the PROFINET Controller does not support RT Class 2 or RT Class 3, the subfields are set
to off (0x0000).
7.2.3.6 PROFINET MRP Port Status TLV
The PROFINET MRP Port Status indicates the current MRP status of the network port over which this LLDP
message is sent.
This TLV is required when the LLDP sender is an MRP port. It is not present in the LLDP packet issued from a
non-MRP port.
The PROFINET Controller supports the following values:
Subfield
MRP Domain ID
MRRT Port Status
GFK-2571N
Meaning
PNIO Chassis ID Name of Station (character string)
MAC Address Internal MAC Address of Ethernet controller
Meaning
7 PNIO Port ID "port-PPP-SSSSS" (length = 14 bytes)
Contains the MRP domain UUID. Assigned internally by the network node.
Set to 0xFFFFFFFF-FFFF-FFFF-FFFF- FFFFFFFFFFFF.
0x00 = Off / Not Used
May 2018
Chapter 7. Network Management
Value
Value
Value
147