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connect 2 SFP+ switches together but there is a problem


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Hi all
Please could you help me in this case ?

I know that this question is not 100%  XPE related
I have 2 switches a TP Link with 4 SFp+ port and Mikrotik CRS 309 with 8xSFP+ ports when i have all server connected to the Mikrotik Switch alle is running fine see Picture this is the switch below in the Picture Also the Internet is working what is connected to the switch on the top of the picture in one RJ45 Port.

But when i connect as example one synology server to to the other switch "Red Line" then i cant reach this server --Ping is working sucessfull -- webinterface on the port 5000 in the browser has network error and the synolgy asisstent say there is a network error.
Both Switches running in default settings
What is wrong or what is missing?
thank you for all tips and hints

Diagramm.jpg

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