When using RSTP, BPDUs are sent every Hello Time interval (which is 2 seconds by default) and are not simply relayed anymore. With the 802.1D standard, Non-Root Bridges generate BPDUs when they receive one on the Root Port. This BPDU is then relayed to downstream switches. Topology Change Notification (TCN) BPDUs originated by a switch are also relayed up to the Root Bridge, which then propagates them to all other downstream switches.
With the 802.1w standard, switches now send a BPDU with their current information every Hello Time interval (2 seconds), even if they do not receive . . .
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