| Description |
This article describes possible reasons for an inability to configure a setup with 4x10G using a 100G QSFP28 and offers solutions.
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| Scope | FortiSwitch T1024E , FortiSwitch 1024E v7.4.2. |
| Solution |
The T1024E/FS-1024E has ports 25 and port 26 with a maximum speed of 100G. Each of these ports can be divided into four subports, each operating at speeds of 25G or 10G.
The 4x25G subports can be configured manually using the following option on ports 25 and port 26:
config switch phy-mode
set port25-phy-mode 4x25G
set port26-phy-mode 4x25G
end
It is not possible to manually set a 4x10G. Attempting to manually set 4x10G will result in the following error:
config switch phy-mode
set port25-phy-mode 4x10G
command parse error before '4x10G'
Command fail. Return code -61
One possible option to set speed is as follows:
config switch phy-mode
set port25-phy-mode ?
single-port One port at full base speed.
4x25G Split to four sub-ports (4x10G for 40G or 4x25G for 100G ).
If the configuration is set with phy-mode 4x25G on both port25 and port26, and a 100G QSFP28 is connected to each of these ports with the port speed set to auto-module, the switch can automatically achieve a configuration of 4x25G.
If the configuration is set with phy-mode 4x25G on both port25 and port26, and a 40G QSFP28 is connected to each of these ports with the port speed set to auto-module, the switch can automatically achieve a configuration of 4x10G.
With 100G QSFP28, 4x10G cannot be achieved. The only way to achieve 4x10G is to use only 40G QSFP28 and set the speed auto-module on the port.
Configuration regarding the auto-module is under the physical-port setting as shown below:
sh full-configuration | grep -nEC 12 auto-module
Or:
show full switch physical-port <port-no>
config switch physical-port
edit "port25.1"
set speed auto-module
next
edit "port25.2"
set speed auto-module
next
edit "port25.3"
set speed auto-module
next
edit "port25.4"
set speed auto-module
next
end
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