Operation diagnosis
Basic - L3P
Release
4.0
11/07
9.8
Topology discovery
19
9.8 Topology discovery
9.8.1 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 de-
vices of the shared LAN, once these devices have also activated LLDP.
X sets up a management information schema and object definition for sav-
ing 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. Con-
tent 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 Hom-
ing).
X Information about the VLANs of which the port is a member (VLAN ID and
VLAN name).
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