I have a setup like: - Dual Cisco distribution switches working on PVST+ and connected on dot1q trunk.
A non Cisco access switch working on CST and connected to dual Cisco switches on access port making a triangle topology for redundancy.
Since I don't have access to non cisco switches for making trunk and VLAN's, so connectivity is like: port at the Cisco end switches are in VLAN 100 and ports at access switches are in default VLAN 1.
Do my Cisco PVST+ will operate with non cisco CST without creating loop. (Since I have a triangle topology)