Advantech B+B SmartWorx IMcV-Giga-FiberLinX-III User Manual page 12

iMcV-Giga-FiberLinX-III
HOST: NO LEARNING ON OPTICS & DATA PORTS
The Loopback feature can be set to disable address learning on the OPTICS (or
UPLINK) and DATA ports, allowing the loopback to be performed without
interference from MAC address filtering functions. This is a function on the HOST
unit. Set the REMOTE unit for Loopback then set the HOST to disable learning
so Loopback frames pass from the OPTICS port to the DATA port.
REMOTE: SOURCE/DESTINATION ADDRESS SW AP
A Layer 2 Ethernet switch will discard all received packets with the same MAC
address as sent packets. To avoid this issue, the Loopback feature can swap the
source and destination MAC addresses on the looped data.
OR
ADDRESS SWAP AND CLEAR MULTICAST BIT
In addition to swapping the source and destination MAC addresses on the looped
data, the Loopback feature can also be set to clear the multicast bit. This allows
the looped data to avoid being blocked by any multicast settings.
12