Fortinet FortiGate-800 User Manual download pdf (Page 87)

High availability Advanced HA options

FortiGate-800 Installation and Configuration Guide 87

Replacing a FortiGate unit after failover

A failover can occur because of a hardware or software problem. When a failover

occurs, you can attempt to restart the failed FortiGate unit by cycling its power. If the

FortiGate unit starts up correctly, it rejoins the HA cluster, which then continues to

function normally. If the FortiGate unit does not restart normally or does not rejoin the

HA cluster, you must take it out of the network and either reconfigure or replace it.

Once the FortiGate unit is reconfigured or replaced, change its HA configuration to

match the FortiGate unit that failed and reconnect it to the network. The reconnected

FortiGate unit then automatically joins the HA cluster.

Advanced HA options

You can configure the following advanced HA options using the FortiGate CLI:

• Selecting a FortiGate unit as a permanent primary unit

• Configuring the priority of each FortiGate unit in the cluster

• Configuring weighted-round-robin weights

Selecting a FortiGate unit as a permanent primary 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 select a FortiGate unit as the permanent primary unit by changing its priority and

configuring it to override any other primary unit.

To select a permanent primary unit

1 Connect to the CLI of the FortiGate unit that you want to become the permanent

primary unit.

2 Set the priority of the permanent primary unit. Enter:

set system ha priority <priority_int>

Where <priority_int> is the priority to set for the permanent primary unit. The unit

with the lowest priority becomes the primary unit. The default priority is 128. Set the

priority of the permanent primary unit to a number lower than 128.

For example, to set the priority of the permanent primary unit to 10, enter the

command:

set system ha priority 10

3 Make sure that the priority of all the other units in the cluster is higher than the priority

of the permanent primary unit.

The command get system ha mode displays the current priority of the FortiGate

unit that you are connected to.

4 Configure the permanent primary unit to override an existing primary unit when it joins

the cluster. Use the following command to configure primary unit override:

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Fortinet FortiGate-800 User Manual Page 87