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HP Switch Trunking Causes Loop-back on network

I have two new HP2824 Procurve Switches, I setup a Trunk on Ports 20 and 21 from the CLI.  When I connect a cable to the rest of the network, a loop back condition happens on the network.  All of the clients start dropping network connections and the entire network goes down.  Does anyone what I have done wrong setting up the Trunk?  Everything is in VLAN0
Switches / Hubs

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8/22/2022 - Mon