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FortiBridge operating principles 
Example FortiGate HA cluster FortiBridge application
FortiBridge Version 3.0 Administration Guide
09-30000-0163-20061109
15
Example FortiGate HA cluster FortiBridge application
A FortiBridge unit can provide fail open protection for a FortiGate HA cluster 
operating in transparent mode in much the same way as for a standalone 
FortiGate unit. To provide fail open protection for an HA cluster, connect the 
FortiBridge unit to the switches that connect the internal and external interfaces of 
the cluster. Use the following steps to connect a FortiBridge unit to the HA cluster, 
as shown in 
Figure 7
:
Figure 7: FortiBridge unit providing fail open protection for a FortiGate HA cluster
The network configuration and FortiBridge configuration are the same for a cluster 
and for a standalone FortiGate unit. In normal mode, packets pass through the 
FortiBridge unit and through the FortiGate HA cluster and back through the 
FortiBridge unit. For the cluster to process this traffic, you must add 
Internal -> External firewall policies to the cluster configuration. If a failure occurs 
and the cluster no longer processes traffic, the FortiBridge unit switches to bypass 
mode, bypassing the cluster. 
The connection procedure is different depending on whether the FortiBridge unit 
uses copper gigabit ethernet network connections or fiber gigabit ethernet 
network connections. This section includes the following connection procedures:
Connecting the FortiBridge-1000 (copper gigabit ethernet)
The FortiBridge-1000 unit contains 4 auto-sensing 10/100/1000 Ethernet 
interfaces that connect to the internal and external networks and to the cluster 
interfaces that were connected to these networks. Use the following steps to 
connect a FortiBridge-1000 unit to the network as shown in 
Figure 7
.
Router
INT 1
INT 2
EXT 1
EXT 2
Internal
External
Internal network
Internet
(Transparent mode)
(Normal mode)
HA cluster
Probe packets
Note: Normally, you would use straight-through ethernet cables to connect the 
FortiBridge-1000 unit to the FortiGate unit and to your networks. However, for some 
connections you may need a crossover ethernet cable (for example, for compatibility with 
network devices that do not support Auto MDI/MDIX).