The nice thing about a mgmt vlan in large networks is you can reduce the number of vlans you trunk. For example, if you had a large deployment with dozens of data, voice and wireless vlans, you may not want to trunk every vlan every where. Instead, you trunk just the required vlans to the physical switches, then add a single mgmt vlan. This accomplishes two thing. 1) you can easily move a switch at any time and have mgmt access to it since the mgmt vlan is trunked everywhere 2) you can spin up/down the user vlans separate from the mgmt vlan. Handy if you need to do work on the vlan and don't want to kill the vlan the Meraki is on. Yes, this is maybe the old way to do it and not required for the Meraki deployments, but it's still good practice and something to consider.
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