Hello Team    i'm deploying the below architecture        the WAN failover is done correctly, but in LAN part :   if i unplung the port 3 of MX1, i'm facing a dual Master situation, i know that the recommandation of Meraki is to have this design :    https://documentation.meraki.com/MX/Deployment_Guides/MX_Warm_Spare_-_High_Availability_Pair   but since there is no Agg-Port on the MX, i'm not really fan to deal with STP    my first question :    is it normal to have a dual master situation with this design? since on the documentation, Meraki is saying that we need to have at least one port downlink ?    Fully Redundant (Switch Stack) In this architecture, the Primary and Secondary MXs are connected via a downstream switch stack. Each switch has at least one uplink to each MX. This ensures that there is no single point of failure in the topology.      my second question, what is the warm spare design that you are deploying in your environement ?   thanks in advance                      ... View more