Lldp - Siemens SIMATIC NET SCALANCE SC-600 Configuration Manual

Configuring with Web Based Management
4.5 "Layer 2" menu
• Restr. Role
If this check box is selected, the corresponding port is not selected as root port,
regardless of the priority value. If the check box is selected, the port with the lowest
priority also does not become the root port. Only activate this option if you wish to
restrict the impact of bridges outside of the administered range to the Spanning Tree
topology.
• Restr. TCN
If this check box is selected, the corresponding port does not forward either received
or detected topology changes (Topology Change Notifications) to other ports. Only
activate this option if you wish to restrict the impact of bridges outside of the
administered range to the Spanning Tree topology.
4.5.6

LLDP

Identifying the network topology
LLDP (Link Layer Discovery Protocol) is defined in the IEEE 802.AB standard.
LLDP is a method used to discover the network topology. Network components
exchange information with their neighbor devices using LLDP.
Network components that support LLDP have an LLDP agent. The LLDP agent sends
information about itself and receives information from connected devices at periodic
intervals. The received information is stored in the MIB.
Applications
PROFINET uses LLDP for topology diagnostics. In the factory setting, LLDP is enabled
for all available ports; in other words, LLDP frames are sent on the ports.
The information sent is stored on every device with LLDP capability in an LLDP MIB file.
Network management systems can access these LLDP MIB files using SNMP and
therefore recreate the existing network topology. In this way, an administrator can find
out which network components are connected to each other and can localize disruptions.
On this page, you have the option of enabling or disabling sending and/or receiving per
port.
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SCALANCE SC-600 Web Based Management (WBM)
Configuration Manual, 10/2021, C79000-G8976-C475-03