The Bridge Protocol Data Unit (BPDU) format used by RSTP is similar to that of the 802.1D BPDU. This ensures backward compatibility between RSTP and 802.1D. However, in the RSTP BPDU, the Protocol Version Identifier and the BPDU Type fields are now set to a value of 2, instead of the value 0, which indicates an IEEE 802.1D BPDU. These differences between the original IEEE 802.1D standard and RSTP BPDU are illustrated below in Figure 4-1:
Fig. 4-1. RSTP BPDU Protocol Version Identifier and BPDU Type Fields . . .
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