Topology Discovery; Description Of Topology-Detection - Hirschmann PowerMICE User Manual

Operation Diagnosis

9.8 Topology Discovery

9.8.1

Description of Topology-Detection

IEEE 802.1AB defines the Link Layer Discovery Protocol (LLDP). LLDP
allows the user to automatically detect the LAN network topology.
Devices with LLDP active
 broadcast their connection and management information to adjacent
devices on the shared LAN. These devices can then be evaluated
provided they also have LLDP active.
 receive connection and management information from adjacent devices
on the shared LAN, provided these devices also have LLDP active.

builds a management-information table and object definitions for storing
information about adjacent devices with LLDP active.
As the main element, the connection information contains an exact, unique
identifier for the connection end point: MSAP (MAC Service Access Point).
This is made up of a device identifier which is unique on the entire network
and a unique port identifier for this device.
Content of the connection and management-information:
 Chassis identifier (its MAC address)
 Port identifier (its port-MAC address)

Description of port

System name
 System description

Supported system capabilities

System capabilities currently active
 Interface ID of the management address

VLAN-ID of the port
 Auto-negotiation status at the port
 Medium, half/full duplex setting and port speed setting
UM Basic Configuration L3P
Release 7.1 12/2011
9.8 Topology Discovery
233