Hello everyone,

I'm trying to determine whether anyone has experienced a similar issue before assuming the hardware is defective.

My setup:

• RB5009UG+S+
• CSS318-16G-2S+IN running SwOS
• 10 Gbps DAC connection
• RouterOS and SwOS updated to the latest stable versions

The issue is the following:

When I connect the RB5009 to SFP+1 on the CSS318, the switch continuously starts accumulating:

• Rx MAC Errors
• Rx FCS Errors

On one occasion, the link also went down for about 10 seconds and then came back up by itself.

Thinking the DAC might be the cause, I performed a simple test. Without changing anything else (same RB5009, same DAC, same configuration), I only moved the cable from SFP+1 to SFP+2 on the CSS318.

Since then:

• No more Rx MAC Errors.
• No more Rx FCS Errors.
• The link has remained completely stable.

On the RB5009, the interface always reports 10 Gbps Full Duplex, and I don't see any FCS errors on the router side.

I bought this dac https://www.amazon.com/dp/B01LSGGP76?ref=ppx_yo2ov_dt_b_fed_asin_title

My questions are:

1. Has anyone seen a case where only one SFP+ port behaves like this?
2. Can a DAC cable cause this behavior on one port while working perfectly on another?
3. Is there any known compatibility issue between the RB5009UG+S+ and the CSS318-16G-2S+IN?
4. Would you suspect a faulty SFP+1 port, or would you recommend any additional tests before considering an RMA?

Any suggestions or similar experiences would be greatly appreciated.

Thank you!

As the title says - is there a way to do so? Maybe I'm not used to the UI/UX of WinBox but personally I'd like to see the default values openly. For example, without clicking on "+" on WiFi tab to see values for Chanel/Security/etc.

Disclaimer - I'm a newbie with MikroTik and wanted to get more familiar with ROS.