Hello I bought a unit from CRS305-1G-4S+IN to transport 2GB to a site on our network.
The equipment on our site is all equipped with an ethernet port, so we bought two SFP-Ethernet modules to connect directly to our RB1100.
The problem is between the communication of the crs305 and the RB1100AH, the equipment gives a link in the ports, but there is no communication between the equipment.
There is no TCP communication nor does the arp table receive the opposite mac-address.
What can be done?

Good Evening,

Did you try to disable "auto negotiation" on the SFP+ Interfaces of the crs305 ?
Set Speed manually to 1Gbps Full-Duplex

yes, but without sussess...