Synchronizing sessions between FGCP clusters

Synchronizing sessions between FGCP clusters is useful when data centers in different locations are used for load-balancing, and traffic must be shared and flow freely based on demand.

There are some limitations when synchronizing sessions between FGCP clusters:

• All FortiGates must have the same model and generation, hardware configuration, and FortiOS version.
• All sessions cannot be synced between clusters. Currently, only TCP sessions can be synced.
• A total of 16 clusters can share sessions.

To configure session synchronization between two clusters:

1. Configure the two clusters (see HA active-passive cluster setup or HA active-active cluster setup).
2. On each cluster, enable session synchronization among HA clusters:

   config system ha
       set inter-cluster-session-sync enable
   end

3. On cluster A, configure the peer IP for the interface:

   config system interface
       edit "port5"
           set vdom "root"
           set ip 10.10.10.1 255.255.255.0
           set allowaccess ping https ssh snmp http telnet
       next
   end

   In this example, cluster A uses port5 and its IP address, 10.10.10.1, is reachable from another cluster.

4. On cluster A, configure cluster synchronization:

   config system cluster-sync
       edit 1
           set peerip 10.10.10.2
       next
   end

5. On cluster B, configure the peer IP for the interface:

   config system interface
       edit "port5"
           set vdom "root"
           set ip 10.10.10.2 255.255.255.0
           set allowaccess ping https ssh snmp http telnet
       next
   end

   In this example, cluster B uses port5 and its IP address, 10.10.10.2, is reachable from another cluster.

6. On cluster B, configure cluster synchronization:

   config system cluster-sync
       edit 1
           set peerip 10.10.10.1
       next
   end