Why do the switches need a public DNS Server to show up as green on the portal?
We're installing 12 MS-120 switches in a remote office and the switches are showing a DNS misconfigured error when we use the IP of the mgmt vlan as the DNS Server. That is configured on an MX84. If I enter a secondary DNS Server IP of 22.214.171.124, they go from Yellow to Green on the portal. What does having a public DNS IP on each switch buy me? I can still get to the switches without it.
They don't need a public DNS server. I have lots that point to the private IP of my MX (that's also the DHCP server) and they work just fine. It's more likely that something is failing resolution using that DNS server.