Pilz PSSnet SHL 8T MRP - Manual (Page 167)

Operation diagnosis
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9.7 Topology discovery
PSSnet SHL - Basic Configuration
Pilz GmbH & Co. KG, Felix- Wankel Str. 2, 73760 Ostfildern
9.7 Topology discovery
9.7.1 Description of topology discovery
IEEE 802.1AB describes the Link Layer Discovery Protocol (LLDP). LLDP
enables the user to have automatic topology recognition for his LAN.
A device with active LLDP
X sends its own connection and management information to neighboring
devices of the shared LAN, once these devices have also activated LLDP.
X receives connection and management information from neighboring
devices of the shared LAN, once these devices have also activated LLDP.
X sets up a management information schema and object definition for
saving connection information of neighboring devices with active LLDP.
A central element of the connection information is the exact, unique ID of a
connection point: MSAP (MAC Service Access Point). This is made up of a
device ID unique within the network and a port ID unique for this device.
Content of the connection and management information:
X Chassis ID (its MAC address)
X Port ID (its port MAC address)
X Description of the port
X System name
X System description
X Supported system capabilities (e.g. router = 14 or switch = 4)
X Currently activated system capabilities
X Interface ID of the management address
X VLAN ID of the port
X Status of the autonegotiation at the port
X Medium, half and full duplex settings and speed setting of the port
X Information about whether a redundancy protocol is switched on at the
port, and which one (STP, RSTP, HIPER-Ring, Ring Coupling, Dual
Homing).