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What factor make a device Active and another Standby, and when Active become standby does it become

Gajji
Cirrus
Cirrus

What factor make a device Active and another Standby, and when Active become standby does it become Active again once a network is stable (or anything that make it standby earlier)

3 REPLIES 3

CA_Valli
Cumulonimbus
Cumulonimbus

This very much depends on your configuration. According to KB: 

The BIG-IP system initiates failover according to any of several events that you define. These events fall into these categories:

System fail-safe
With system fail-safe, the BIG-IP system monitors various hardware components, as well as the heartbeat of various system services. You can configure the system to initiate failover whenever it detects a heartbeat failure.
Gateway fail-safe
With gateway fail-safe, the BIG-IP system monitors traffic between an active BIG-IP system in a device group and a pool containing a gateway router. You can configure the system to initiate failover whenever some number of gateway routers in a pool of routers becomes unreachable.
VLAN fail-safe
With VLAN fail-safe, the BIG-IP system monitors network traffic going through a specified VLAN. You can configure the system to initiate failover whenever the system detects a loss of traffic on the VLAN and the fail-safe timeout period has elapsed.
HA groups
With an HA group, the BIG-IP system monitors trunk, pool, or cluster health to create an HA health score for a device. You can configure the system to initiate failover whenever the health score falls below configurable levels.
Auto-failback
When you enable auto-failback, a traffic group that has failed over to another device fails back to a preferred device when that device is available. If you do not enable auto-failback for a traffic group, and the traffic group fails over to another device, the traffic group remains active on that device until that device becomes unavailable.

Thanks for the answer

But i still won't understand how do i make one device as Active.. what config need to be done.

CA_Valli
Cumulonimbus
Cumulonimbus

You have the option to manually failover a traffic group with the Force to Standby button.