Question: if you have two #mikrotik #switches with #VLAN enabled (CRS317-1G-16S+RM) and you want to connect them via a #crosslink (sfpplus-16), to have a #failover switch (Debian uses tagged VLAN via bond0 with active-backup) and it works only, if you don't have VLAN at all, what can be the issue ? It works only if all Hosts have the active NIC on the same switch. If Host 1 has active on Switch 1 and Host 2 on Switch 2, network stops between them. Btw: MLAG is broken on #mikrotik since years.