RSTP uses an explicit handshake mechanism between switches via the use of the proposal and agreement flags. This handshake is performed as follows:
- When a designated port is in a discarding or learning state, and only in either of these two states, it sets the proposal bit on the BPDUs it sends out. This is so that the switch can become a designated bridge for that segment. This proposal includes the BID and port role of the sending switch, which would be Switch 1. This is illustrated below in Figure 4-7:
Fig . . .
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