Description
This article explains the override enable wait timer option to address issue when HA override option is enabled on Active-Passive deployment, during HA fall back the former master unit will reclaim back the master role and will cause network interruption.
With this override-wait-timer option configured under HA setting, it makes the former master unit wait for number of second before taking back the master role, this is to ensure that all the sessions and routing tables have been completely synced.
The override wait time can only be configured when HA override is enabled, and it is only activated after a unit boots up. For example, it is not activated after a failover triggered by the monitor interface, or when HA is changed from standalone mode to A-P or A-A mode.
Solution
Non virtual cluster environment.
Configure this option on the master unit where override is enabled which having higher priority, for non-virtual setup most of the time will be configure on the master unit.
config system ha
set override-wait-timer <n sec>
end
Here is an example of working HA setting
config system ha
set group-name "HA_cluster"
set mode a-p
set hbdev "port27" 100 "port28" 100
set session-pickup enable
set override enable << ensure override is enable
set override-wait-time 120 << enable this command
set priority 200
Virtual cluster environment.
On virtual cluster environment, some environment required to have VDOM running on passive or slave unit to make both device running at the same time sort of like Active-Active deployment in the matter of fact is still configure as Active-Passive.
Setting still the same and do applied to device that having higher priority, below is the sample of the setup.
Master HA setting:
config system ha
set group-name "HA_cluster"
set mode a-p
set hbdev "port27" 100 "port28" 100
set session-pickup enable
set vcluster2 enable
set override enable <-- Ensure override is enabled.
set override-wait-time 120 <-- override-wait-time.
set priority 200
config secondary-vcluster
set override enable <-- Ensure override is enabled.
set priority 100
set monitor "port9" "port10"
set vdom "WANFW"
end
end
Slave HA setting.
config system ha
set group-name "HA_cluster"
set mode a-p
set hbdev "port27" 100 "port28" 100
set session-pickup enable
set vcluster2 enable
set override enable <-- Ensure override is enabled.
set priority 100
config secondary-vcluster
set override enable <-- Ensure override is enabled.
set override-wait-time 120 <-- override-wait-time.
set priority 200
set monitor "port9" "port10"
set vdom "WANFW"
end
