@heiki wrote: Meraki support was not of much help. Basically they require for a distribution switch to be the root switch which is directly connected to both active and spare MXs. And all other switches must be connected to the distribution (root) switch... as in the Meraki documentation: https://cheapessaywriter.meraki.com/MX-Z/Deployment_Guides/NAT_Mode_Warm_Spare_(NAT_HA)   I did not get a clear answer from Meraki if my deisgn is to be supported somewhere in the future or not. I guess the only way getting this to work is redesigning current setup. I know I won't be buying a couple of MS425-32 switches to support all the 10Gbps links from other switches 😄     You're right buying MS425-32 switches to support all the 10Gbps links from other switches isn't the smartest idea. I think you should read through this link https://www.willette.works/mx-warm-spare/ if you're considering redesign of a setup. ... View more