Billion M500 User Manual page 75

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Failover & Failback
WAN Port Service Detection Policy
WAN1: Select "4G/LTE-1", "4G/LTE 2" , "EWAN" or "Wireless Client" for WAN1 (The main WAN).
WAN2: Select the "4G/LTE-2", "EWAN" or "Wireless Client" for WAN2 as backup port if you select
"4G/LTE-1" as WAN1.
Keep Backup Interface Connected: Select if to keep backup WAN interface connected to the
internet. When select " By Signal Strength " , please set the next minimum RSRP/RSSI.
Minimum RSRP / RSSI: Set a minimum requirement for RSRP(Reference Signal Receiving Power)
and RSSI(Received Signal Strength Indicator) for initiating automatic WAN failback or failover
procedures.
Connectivity Decision & Probe Cycle: Set a number of times and time in seconds to determine
when to switch to the backup link (WAN2) when primary link (WAN1) fails and vise versa.
Example, Auto failover takes place after straight 3 consecutive failures in every 30 seconds meaning
all traffic will hand over to backup link (WAN2) after primary link fails to response in total of 90 seconds,
30 seconds for 3 consecutive failures.
Note: Failover and Failback follow the same Connectivity Decision & Probe Cycle rule to failover
from WAN1 to WAN2 or fallback from WAN2 to WAN1.
Failover/Fallback Rule Decisions:
Probe By Ping: Enable Ping to the gateway or an IP address.
 Gateway: Internal system will wait for responses to the pings from the gateway of the WAN.
 Host: Internal system will wait for responses to the pings from a fixed IP address.
Probe by Signal Strength: Enable to measure the LTE signal strength
 Minimum RSRP / RSSI: Set a minimum requirement for RSRP and RSSI for initiating
automatic WAN failback or failover procedures.
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