Hey,
as far as I understand mellanox switches can not be stacked.
How does it actually work out to connect to switches and create redundancy for a Proxmox Cluster?
I have no Mellanox switch experience but generally when dealing with modern datacenter switches the thing to do is set up MLAG (Multichassis Link Aggregation, vendor names include VTP and VPC) between the two switches, which allows the Proxmox nodes and any other switches to create an LACP trunk across the two switches and think they’re a single switch. If one switch or link dies things will run through the other. We do this with Arista, Cisco Nexus, and Dell OS10 switches.