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Consider a setup where FortiSwitch is connected to a 3rd party switch using ports 9 and 10 in LACP:
For example, trunk configuration:
FortiSwitch# show switch trunk
edit "MCLAG-1"
set mode lacp-active
set members "port9" "port10"
end
The linerate below shows that received traffic is load-balanced on ports 9 and 10 at 279 and 251 Mbps, respectively. However, the transmit traffic from the FortiSwitch is sent mostly on port 9, at 203 Mbps, while port 10 is underutilised.
FortiSwitch# diagnose switch physical-ports linerate up
port9 | 203Mbps | 279 Mbps
port10 | 0.5Mbps | 251 Mbps
The trunk load balance hash algorithm occurs in Hardware. Try the configuration below on the FortiSwitch to modify the hashing algorithm:
config switch global
set trunk-hash-mode L4-port hash
set trunk-hash-unicast-src-port enable
set trunk-hash-unkunicast-src-dst enable
end
config system settings
set ip-ecmp-mode source-ip-based dst-ip-based port-based
end
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