Fortinet fortigate-100a Betriebsanweisung

Optionally set the unit priority of the cluster unit. Each cluster unit can have a different 
unit priority (the unit priority is not synchronized among cluster members). During HA 
negotiation, the unit with the highest unit priority becomes the primary cluster unit. The 
unit priority range is 0 to 255. The default unit priority is 128.

You can use the unit priority to control the order in which cluster units become the 
primary cluster unit when a cluster unit fails. For example, if you have three 
FortiGate-3600s in a cluster you can set the unit priorities as shown in 

. Cluster 

unit A will always be the primary cluster unit because it has the highest priority. If 
cluster unit A fails, cluster unit B becomes the primary cluster unit because cluster unit 
B has a higher unit priority than cluster unit C.

The unit priority is not synchronized to all cluster units. Each cluster unit can have a 
different unit priority.

In a functioning cluster, if you change the unit priority of the current primary cluster unit 
to a lower priority, when the cluster renegotiates a different cluster unit becomes the 
primary cluster unit.

Configure a cluster unit to always override the current primary cluster unit and become 
the primary cluster unit. Enable override master for the cluster unit that you have given 
the highest unit priority. Enabling Override Master means that this cluster unit always 
becomes the primary cluster unit.

In a typical FortiGate cluster configuration, the primary unit is selected automatically. 
In some situations, you might want to control which unit becomes the primary unit. You 
can configure a FortiGate unit as the permanent primary unit by setting a high unit 
priority and by selecting override master. With this configuration, the same cluster unit 
always becomes the primary cluster unit. 

If override master is enabled and the primary cluster unit fails another cluster unit 
becomes the primary unit. When the cluster unit with override master enabled rejoins 
the cluster it overrides the current primary unit and becomes the new primary unit. 
When this override occurs, all communication sessions through the cluster are lost 
and must be re-established.

Override master is not synchronized to all cluster units.

In a functioning cluster, if you select override master for a cluster unit the cluster 
negotiates and may select a new primary cluster unit.

A

200

B

100

C

50