yes generally when you have Instant APs that are managed by Aruba Central and you want different VLANs for various clients that connect, then you need to configure VLAN trunking on the switches ans allow the VLAN IDs that you require.
Remember the Instant APs are not routers.
the default gateways for each of those VLANs will do the routing.
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Any opinions expressed here are solely my own and not necessarily that of Hewlett Packard Enterprise or Aruba.
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