Hi,   I am struggling a bit on this setup and not sure if its supported.   I have 2 x MX 85 in a warm spare setup with the shared Virtual IP  2 x MS350 2 x MS250   layer 3 all done on the MX and we have  VLANS setup on here  (Server VLAN 6 , Desktop VPN  VLAN 4, Voice VLAN 3 , Switches / networking  VLAN 😎 I had it all working in the past when we had 1 switch stack connected to each MX with he MS doing layer 3.   We want to simplify the Network and have Vlans setup on MX, and removed all VLANS off MS, 2 MS 350 for servers / nas and ESX hosts and the 2 x 250 for users with POE for some phones.  We decided to remove the stacks and make each switch standalone with VIP users having 2 NICS 1 to each switch, as we had issues with Stacks in the past and prefer for simplicity to just have them as standard dumb layer 2. and if 1 breaks, we move users over to the other one, or they have a 2nd NC on the 2nd Switch.    I have managed to get both MX up and all 4 switches, but when I try do a switchover form MX 1 to 2 to test, it all falls over.   Each switch has port 1 going to MX 1 port and Switch port 2 going to HA MX RSTP Enabled on the uplink ports on switch STP Guard Disabled   no Cable between MX no cables between any Switches, only each one to each MX   Switch Port uplinks set as Trunk,  native Vlan 8  MX ports to MS - Trunk -  Native Vlan 8  ( Also tried with drop untagged traffic) - still no good     Can someone give me some advice on where I am going wrong , what the configs should be as I have read some users like a cable between MX, some use a cable between MS (if this is the case, with 4 what do you do)  And what VLAN should we use for the interconnect cables to MX and MS if thats the way.   I think it will all work if I had 1 switch and 2 MX, but having 4 MS I think I have maybe made it more complicated!   Thanks             ... View more