Billion BiPAC 8900X R3, User Manual, Page: 102 / 261

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Failover
Auto failover/failback is to ensure an always-on internet connection. Users can set a Master WAN
interface (main WAN) and a slave interface (backup WAN), and when Master WAN fails, it will switch
to slave WAN, and when master WAN restores, it will switch to master WAN interface again.
L3 WAN Failover: Check Enable to activate L3 WAN failover.
Master Interface: Select a master WAN interface.
Ping: To ping to check the master WAN interface’s connectivity.
Gateway: It will send ping packets to gateway of master interface and wait for response from
it in every “Probe Cycle” to check the connectivity of the gateway of master interface.
Host: It will send ping packets to specific host and wait for response in every “Probe Cycle”.
Slave Interface: Select a slave WAN interface as backup port.
Ping: To ping to check the slave WAN interface’s connectivity.
Gateway: It will send ping packets to gateway of slave interface and wait for response from it
in every “Probe Cycle” to check the connectivity of the gateway of slave interface.
Host: It will send ping packets to specific host and wait for response in every “Probe Cycle”.
Probe Cycle: Set the time duration for the Probe Cycle to determine when the router will switch to
the backup connection once the main connection (main port) fails. For example, when set to 30
seconds, the probe will be conducted every 30 seconds.
Connectivity Decision: Set how many times of probing failure to switch to backup port.
Fallback: Enable to reconnect to the master interface when master interface connection recovers.
Note:
1) The time set is for each probe cycle, but the decision to change to the backup port is determined
by Probe Cycle multiplied by connection Decision amount (e.g. From the image above it will be
30 seconds multiplied by 3 consecutive fails, the router will determine failover to slave interface.
2).The failback setting follow the same decision policy as the failover. For example, according to
settings above in the screenshot, the connection probe will be carried out every 30 seconds, and 3
consecutive times of probe success is found, the router will determine failback to master interface