RSTI-EP PROFINET I/O Controller User Manual
Section 7
GFK-2571R
May 2021
Network Management
147
Name
Value
sysContact
Nothing (empty string)
sysName
The
Device Name
assigned to the node. If the
Device Name
hasn’t been
assigned yet, an empty string is returned.
sysLocation
Nothing (empty string)
sysServices
79 (0x4F)
This value indicates the PROFINET Controller has Layers 1
–
4 (physical,
datalink, network and transport) and Layer 7 (application) functionality.
7.2
LLDP
The PROFINET Controller implements the Link Layer Discovery Protocol (LLDP). A PROFINET
IO-Supervisor or other network host may use LLDP to discover the PROFINET network.
7.2.1
Overview of LLDP
The Link Layer Discovery Protocol is an IEEE standardized protocol used by network devices
to advertise their identities and capabilities and receive that information from physically
adjacent link layer peers.
LLDP data packets are sent by devices from each of their interfaces at fixed intervals. The
LLDP packets are multicast and are not forwarded by network switches.
Each LLDP packet consists of one LLDP Data Unit (LLDPDU). Each LLDPDU is a sequence of
Type-Length-Value (TLV) structures.
LLDP Data Unit Contents
Chassis ID TLV structure (mandatory, always first)
Port ID TLV structure (mandatory, always second)
Time to Live TLV structure (mandatory, always third)
Optional Structures (any number of these, in any order)
.
.
.
End of PDU TLV (mandatory, always last)
7.2.2
LLDP Operation
The LLDP agent in the PROFINET Controller multicasts LLDP messages to the network at 5
second intervals, or when a change occurs in any of the local data that is delivered within
the LLDP message. The LLDP messages are transmitted from each external port that is
connected to a network.
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