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In this tutorial, Sunny discusses how the Rapid Spanning Tree Protocol (RSTP) manages network topology changes through the proposal agreement process. The focus is on the BPDU (Bridge Protocol Data Unit) Flex field in RSTP, which differs from that in standard Spanning Tree Protocol (STP). In standard STP, only two out of eight bits in the Flex field are utilized for topology change and acknowledgment. In contrast, RSTP employs all bits, allowing for additional information such as port role, learning, forwarding, and proposal and agreement. Throughout the process, BPDUs serve as a communication tool between switches, enabling them to exchange critical messages for topology management.