Check the phy-mode on the Fortiswitch-2048F ports to make sure 10G/25G are used on them (this is when connecting to either FortiGate or FortiSwitch).
FortiSwitch CLI:
config switch phy-mode set port1-port12-phy-mode 25G set port13-port24-phy-mode 1G/10G set port25-port36-phy-mode 25G set port37-port48-phy-mode 25G end
Disable the FEC-state when connecting FortiSwitch-2048F to FortiSwitch-648F:
Fortiswitch CLI:
config switch physical-port edit port3 set fec-state disabled show end
FortiGate switch-controller CLI:
config switch-controller managed-switch edit <FSW SN> config ports edit port3 set fec-state disabled show end
Check:
diagnose switch physical-ports list port3
FortiGate-601F 10G-25G ULL ports change (x5,x6,x7,x8 ports of the FortiGate-601F can either be set to 10G/25G).
FortiGate CLI:
config system npu set ull-port-mode 10G or 25G end
FortiGate will do a reboot after this change and once it comes back, the ports of the FortiGate will either have 10G or 25G speed set on them.
After these changes, the FortiSwitch-2048F links will connect to the FortiGate-601F and FortiSwitch-648F.
