>1. As far as i have understood SD-WAN and traffic shaping is the same as QoS or maybe not? I tend to think of SDWan as using performance classes over AutoVPN, and you need dual WAN connections to take advantage of it. https://documentation.meraki.com/MX/Firewall_and_Traffic_Shaping/MX_Load_Balancing_and_Flow_Preferences#Flow_Preferences But I guess Traffic Shapping and QoS also fall under that same bruce stroke. >2. For instance if i have Site-to-Site VPN between two sites that are in a Hub connection then i need to have the same settings applied on both SD WAN appliances configured in SD-WAN and traffic shaping ? Well, you would typically, but that is not a hard requirement. Each end could have their own different policies - but you would have different rules being applied based on where a traffic flow originated. >3. Scenario when you have three offices connected with MPLS. Office 2 and 3 reach internet via office 1. Is it correct that if you want to optimize the traffic for the three offices you need to coordinate QoS rules with the ISP that is providing the MPLS connection? Well, yes that is one way. You can also just use traffic shapping. Or you can use dual ISP links (forget MPLS) and then use performance classes for sensitive traffic, and let AutoVPN figure out the best way to achieve your requirements. Note that flip around - you define the requirements and then let the network deliver it - versus the old school method of you buying a network with specific SLAs and specifications in a hope that it meets your requirements.
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