Fortinet FortiController-5913C System Manual page 24

Initial session-aware load balanced cluster setup
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end
You can optionally configure other HA settings.
If you have more than one cluster on the same network, each cluster should have a
different Group ID. Changing the Group ID changes the cluster interface MAC
addresses. Its possible that a group ID setting will cause a MAC address conflict. If this
happens select a different Group ID. The default Group ID of 0 is not a good choice and
usually should be changed.
9 From the FortiController go to Load Balance > Config add the workers to the cluster
by selecting Edit and moving the slots that contain workers to the Members list.
10 Set the workers to FortiController mode. Use the following CLI command:
config system elbc
set mode forticontroller
end
11 Configure the cluster external management interface so that you can manage the
worker configuration. From the FortiController-5913C GUI go to Load Balance >
Config and edit the External Management IP/Netmask and change it to an IP address
and netmask for the network that the mgmt interfaces of the FortiController-5913C
and the workers are connected to. The External Management IP/Netmask must be on
the same subnet as the FortiController-5913C management IP address.
12 Connect FortiController-5913C front panel interface F1 to the Internet and front panel
interface F2 to the internal network.
The workers see these interfaces are named fctrl/f1 and fctrl/f2.
13 Log into the workers using the External Management IP/Netmask and configure the
workers to process traffic between fctrl/f1 and fctrl/f2.
if you need to add a default route to connect to the External Management IP/Netmask,
log into the FortiController-5913C CLI and enter the following command:
config route static
edit route 1
set gateway <gateway-ip>
end
To verify that the worker has joined the cluster, from the FortiController-5913C
web-based manager and go to Load Balance > Status and verify that the worker
appears in the correct chassis slot.
FortiController-5913C Session-Aware Load Balancing Cluster (SLBC) System Guide
Basic Configuration
10-500-259409-20160210
http://docs.fortinet.com/