Troubleshooting Tip : Interface speed cannot be changed when there is aggregated interface in same group

[nevan]

Description	This article describes the reason for the warning message 'Interface speed cannot be changed when there's aggregated interface in same group' and the most effective workaround to resolve this issue.
Scope	FortiGate.
Solution	The warning message 'Interface speed cannot be changed when there's an aggregated interface in same group' indicates that the interface which is selected to change the internet speed is either the member of the aggregated interface or any of the members of the group is a member of the aggregated interface. The group is here to define the interface group depending on hardware acceleration. For example, in 1801F if the hardware acceleration guide informs that the interfaces port33 to port36 or port29 to port32 are in the same group. In this case, if port33 is in the aggregation link or any of the group members or interfaces between 33 to 36 is in the aggregation link the following error will appear which is expected. CLI: config system interface     edit "port33"         set speed 25000full <---        next     Interface speed cannot be changed when there's aggregated interface in same group     next end The effective workaround can be: Finding the group based on the hardware acceleration guide Remove all the interfaces or members from the aggregation link. Change the interface speed. Reconfigure the interface aggregation link including the members. Interface speed can affect the 'forward-error-correction' settings. The following article can be followed to check and set the error connection settings:Technical Tip: changes in Forward Error Correct (FEC) settings