I got myself a little switch (CSS106-5G-1S) and wanted to connect it to CRS317-1G-16S+ with DAC cable. I connected it to CRS port sfp-sfpplus15, disabled auto-negotiation and set link speed to 1G. Link was up. I tried to do some VLAN setup but when that didn’t work I tried to reset and just do no VLAN ping from device on CSS to CRS.

Nothing
CSS has default config. This is what I added to CRS:
/interface bridge add name=TEST
/interface ethernet set [ find default-name=sfp-sfpplus15 ] auto-negotiation=no l2mtu=1592 name=isp
/interface bridge port add bridge=TEST ingress-filtering=no interface=isp
/ip address add address=192.168.100.80/24 interface=isp network=192.168.100.0
Why can’t I ping CRS from Device? Why can’t I ping CSS or Device from CRS? I don’t get it. Could it be because I’m connecting SFP to SFP+? Could it be the DAC? I have a generic one from FS and they say the cable is compatible with SFP. I mean, it states that the link is up on both sides (CSS: link on, CRS: Running Slave) so it should not be the problem. What am I doing wrong?