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FortiSwitch-5003A and 5003   Fabric and Base Backplane Communications Guide
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01-30000-85717-20081205
Base channel connections between FortiSwitch-5003A boards
FortiGate-5140 and 5050 base backplane communication
This section contains example base channel HA and network configurations for 
each hardware combination. It also discusses how to choose an appropriate 
amount and slot number of FortiSwitch boards for base backplane HA.
This section describes:
Base channel connections between FortiSwitch-5003A boards
Two FortiSwitch-5003A boards in the same chassis are connected together 
across the base backplane channel. For some versions of the FortiSwitch-5003A 
firmware, this connection cannot be disabled. The base channel connection 
between the FortiGate boards is not usually a problem if the FortiGate-5000 
boards in the chassis are operating in NAT/Route mode and the base channels 
are being used for HA heartbeat packets. However, you should avoid using the 
base channels for data traffic unless it is acceptable for traffic to go between the 
base channels.
If the FortiGate-5000 boards are operating in transparent mode, the connection 
between the base channels can cause looping. So if you have FortiGate-5000 
boards operating in transparent mode with two FortiSwitch-5003A boards you 
should disable the base interfaces on the FortiGate boards and you should not 
use the FortiSwitch-5003A boards for HA traffic. Alternatively, you could disable 
just one of the base interfaces on all of the FortiGate-5000 boards and use the 
other base interface for the HA heartbeat.
Base backplane HA configurations
Valid HA hardware configurations can be formed from FortiGate boards located in 
either the same or multiple FortiGate-5050 or FortiGate-5140 chassis, with either 
one or two FortiSwitch boards per chassis. 
Inter-chassis HA configuration requirements are identical to HA configuration 
within the same chassis, except for these additional requirements.
• Link multiple chassis base backplanes by connecting FortiSwitch-5003A base 
front panel interfaces that have the same slot number.
• Link multiple chassis base backplanes by connecting FortiSwitch-5003 ZRE 
interfaces that have the same slot number.
• You can also connect FortiSwitch-5003A base front panel interfaces to 
FortiSwitch-5003 ZRE interfaces that have the same slot number.
• If each chassis contains only one FortiSwitch board, install each FortiSwitch 
board in matching slot numbers. For example, you could link HA members in 
separate FortiGate-5140 and FortiGate-5050 chassis. If one chassis has only 
one FortiSwitch board installed in hub/switch slot 2, the other chassis 
FortiSwitch board must also be installed in hub/switch slot 2. For details, see 
.
If you do not install each FortiSwitch board in matching slot numbers, instead 
of forming a single cluster, this forms multiple clusters, some using port9 or 
base1 for HA heartbeat communication, and some using port10 or base2.