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ULL interface marked to 10Gb by default, to enable 25 Gb speed an NPU level command is required.
For Devices with VDOMS, login as super_admin and modify the settings user:
# config system global
# config system npu
Before:
# config system npu
set ull-port-mode 10G
end
ULL interface:
MID-FG601F-01 (x6) # set speed
10000full 10G full-duplex.
# dia npu np7 port-list
x1 10000 10000 n/a 0 6
x2 10000 10000 n/a 0 7
x3 10000 10000 n/a 0 4
x4 10000 10000 n/a 0 5
x5 10000 10000 n/a n/a n/a n/a
x6 10000 10000 n/a n/a n/a n/a
x7 10000 10000 n/a n/a n/a n/a
x8 10000 10000 n/a n/a n/a n/a
-------- --------------- --------------- --------------- --------- ----------
After:
# config system npu
set ull-port-mode 25G
end
MID-FG601F-01 (x6) # set speed
25000full 25G full-duplex.
# dia npu np7 port-list
x1 10000 10000 n/a 0 6
x2 10000 10000 n/a 0 7
x3 10000 10000 n/a 0 4
x4 10000 10000 n/a 0 5
x5 25000 25000 n/a n/a n/a n/a
x6 25000 25000 n/a n/a n/a n/a
x7 25000 25000 n/a n/a n/a n/a
x8 25000 25000 n/a n/a n/a n/a
A reboot will automatically take effect. Choose to change interface speed.
NP7 ULL port mode speed change will take effect after the system reboot.
Do you want to continue? (y/n)y
To validate if an interface is supported or not, lookup the datasheet for the product.
In this instance, it is for a FortiGate-601F with ULL interfaces supported. Interfaces are X5- X9 where one could only set 10Gb speeds although interface supports 25Gb.
If there are issues where after setting 25GE on the interface and the interface still down, view the related article below and change FEC settings.
This is only supported on interfaces that support 25GE.
Related articles:
Technical Tip: 25 Gigabit Ethernet connection between FortiGate and Cisco Nexus
https://community.fortinet.com/t5/FortiGate/Technical-Tip-25-Gigabit-Ethernet-connection-between-For...
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