Versiton SF70460MP, Installation Manual

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4.4 2C1F Mode
“2C1F” mode is an operating mode that dual media converters shares one fiber segment. Under this mode Port
3 and Port 4 become a link aggregation port “P3/4”. It is also called a trunk port.
P1 port and P3/4 port are ports of MC1. P2 port and P3/4 port are ports of MC2. Both MC1 and MC2 are
independent, but just share one trunk port for uplink. Trunk port P3/4 is LACP compliant. Both P3 and P4 are
operating at the same time normally. When any is in link fault, the other will take over the transmission duty for
both MC1 and MC2. LFPT function is also available for this mode.
LFPT operations are:
1. When trunk port P3/4 link failed (both P3 and P4 port link failed), P1 port and P2 port are forced to link down.
2. When both P1 and P2 port link failed, trunk port P3/4 is forced to link down. (Both P3 and P4 are link down.)
3. Only one link failure within P1 and P2 will not cause P3/4 link down.