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Operation Diagnostics
9.7 Topology discovery
9.7 Topology discovery
9.7.1 Description Topology discovery
IEEE 802.1AB describes the Link Layer Discovery Protocol (LLDP).
LLDP allows users to automatically detect the topology of their LANs.
A device with active LLDP
D sends its own connection and management information to neighboring
devices of the shared LAN, in as far as they have also LLDP activated.
D receives connection and management information from neighboring devices of the shared LAN, in as far as they have also LLDP activated.
D sets up a management information scheme and object definitions for
saving connection information of neighboring devices that have LLDP
activated.
The connection information contains as its most significant element the
precise and unique ID of a connection endpoint: MSAP (MAC Service
Access Point). This is composed of the MAC address of the device and a
port ID that is unique to this device.
Contents of the connection and management information:
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Chassis ID (its MAC address)
Port ID (its port MAC address)
Description of the port
System name
System description
Supported “system capabilities” (e.g. router = 14 or switch = 4)
Currently activated “system capabilities”
Interface ID of the management address
VLAN-ID of the port
Status of autonegotiation on the port
Medium, half/full duplex setting and transmission speed setting of the port
Information about the redundancy protocol (STP, RSTP, HIPER-Ring,
ring coupling, dual homing) which is activated at this port.
D VLAN information concerning the port (VLAN ID and VLAN name).
Basic - L2E
Release 3.1 06/07
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