Changing the ping server failover threshold
By default the ping server failover threshold is 0 and the HA priority is 1 so any HA remote IP monitoring ping server failure causes a failover. If you have multiple ping servers you may want a failover to occur only if more than one of them has failed.
For example, you may have 3 ping servers configured on three interfaces but only want a failover to occur if two of the ping servers fail. To do this you must set the HA priorities of the ping servers and the HA ping server failover threshold so that the priority of one ping server is less thana the failover threshold but the added priorities of two ping servers is equal to or greater than the failover threshold. Failover occurs when the HA priority of all failed ping servers reaches or exceeds the threshold.
For example, set the failover threshold to 10 and monitor three interfaces:
config system ha
set pingserver-monitor-interface port2 port20 vlan_234
set pingserver-failover-threshold 10
set pingserver-flip-timeout 120
end
Then set the HA priority of each ping server to 5.
| The HA Priority (ha-priority) setting is not synchronized among cluster units. In the following example, you must set the HA priority to 5 by logging into each cluster unit. |
config router gwdetect
edit port2
set server 192.168.20.20
set ha-priority 5
next
edit port20
set server 192.168.20.30
set ha-priority 5
next
edit vlan_234
set server 172.20.12.10
set ha-priority 5
end
If only one of the ping servers fails, the total ping server HA priority will be 5, which is lower than the failover threshold so a failover will not occur. If a second ping server fails, the total ping server HA priority of 10 will equal the failover threshold, causing a failover.
By adding multiple ping servers to the remote HA monitoring configuration and setting the HA priorities for each, you can fine tune remote IP monitoring. For example, if it is more important to maintain connections to some networks you can set the HA priorities higher for these ping servers. And if it is less important to maintain connections to other networks you can set the HA priorities lower for these ping servers. You can also adjust the failover threshold so that if the cluster cannot connect to one or two high priority IP addresses a failover occurs. But a failover will not occur if the cluster cannot connect to one or two low priority IP addresses.