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PROmesh P9+
– User Manual
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Late (a collision that occurs after more than 512 bits)
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Total
. Such collisions and the associated data loss always occur when several subscribers want to send
simultaneously on one medium.
Neighbourhood detection (LLDP)
The Link Layer Discovery Protocol (LLDP) is a vendor-independent layer-2 protocol that provides the ability
to exchange information (addresses, names, and descriptions) between neighbouring devices. An LLDP
agent operates on every device that supports LLDP. This sends information about its own state at periodic
intervals and receives information from neighbouring devices.
Since this is done independently, LLDP is also referred to as a one-way protocol.
The following information is compiled and sent by LLDP:

Port name

Device name

IP address

Device description
MAC table
The forwarding database provides information about which MAC address is connected to which port of the
switch.
Settings
The LLDP interval parameter can be used to define the time intervals (in seconds) where the device-specific
LLDP telegram is sent to the neighbouring devices. The default setting is 5 seconds.
Port mirroring
Port mirroring is a method of simultaneously directing traffic from one port (source) to a second port
(destination) in networks for inspection. This means that the received and sent packets of the source port
are duplicated to the monitoring port.
Monitoring of the source ports takes place without affecting the traffic of this port. The resulting mirror port
can be connected to a LAN analyser or used for diagnosis and debugging.