For windows update, I'd suggest using other measures to manage distribution and load. Eg. - Use update rings or update windows - Use a local update server or built in delivery optimization That said, to answer your question, you can't achieve exactly what you're after. You can apply traffic shaping rules targeting your clients (using group policies) and applying to Windows update traffic, however you can only set CoS or QoS lablels. You cannot use it to set WAN priority (essentially upstream bandwidth allocation) Otherwise you can use traffic shaping rules to set the WAN priority but you cannot split this out per application. I highly recommend looking at the Meraki docs on Traffic Shaping, CoS, QoS and priority. There's also a bit of a summary in this post: Re: Prioritizing Traffic within Meraki Full Stack - The Meraki Community
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