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Topology is as follows: Huawei's sees itself as the root bridge. Cisco sees itself as root bridge.
A network forwarding loop occurs when the Pvst Simulation Dating topology allows for multiple active paths between two Dting. Broadcast and multicast traffic wreak havoc as Pvst Simulation Dating are forwarded out of every switch port and continue the forwarding loop.
If you do not adhere to these two rules, you encounter the PVST simulation failure.