PLANET IGS-504HPT - Manual (Page 23)

23
2.1.7 Redundancy Overview
The IGS-624HPT Industrial Gigabit PoE+ Switch provides rapid fiber redundancy
of link for highly critical Ethernet applications. The redundant-mode supports
auto-recover function. If the destination port of a packet is link down, it forwards
the packet to the other port of the backup pair. The following figure shows the
redundant function.
Main Primary
Backup
Redundancy
< Primary Port >
Link Status : Up
Traffic Flow : Forwarding
< Backup Port >
Link Status : Down
Traffic Flow : Blocking
Main Primary
Backup
Redundancy
< Primary Port >
Link Status : Down
Traffic Flow : N/A
< Backup Port >
Link Status : Up
Traffic Flow : Forwarding
Traffic is changed from Primary-Port to Backup-Port
Figure 2-5: Redundancy Behavior Topology
l Auto-detects link status and redundant dual ports with the same connector type
l Only Primary Port is active at a time, the Backup Port is blocked.
l When Primary Port link failure occurs, the traffic swaps to Backup Port automati-
cally.
l Once the Primary Port status is connected, the traffic will swap from Backup Port
to Primary Port.