As @cmr said above, it should work without issue. One thing to be aware of is that your C6509 is most likely running PVSTP+ version of spanning tree while the Meraki switch runs MSTP. Both are interoperable but there are some things to be aware of. The following doc covers it off pretty well. https://documentation.meraki.com/MS/Port_and_VLAN_Configuration/Configuring_Spanning_Tree_on_Meraki_Switches_(MS)#Protocol_interoperability ... View more

Meraki AP's store the latest configured configuration locally (so it can continue to operate if it loses connection to the cloud). The following doc outlines the behaviour of different devices in that scenario Behavior during Connection Loss to Cisco Meraki Cloud - Cisco Meraki ... View more