As stated in the previous section, MST uses RSTP for rapid convergence; therefore, each switch must be capable of processing RSTP BPDUs in order to support MST. The MST BPDU format is similar to that of RSTP. The primary difference is that the Protocol Version Identifier Field is 3 and the MST BPDUs contain an MST Extension field, the contents of which will be described in detail later in this chapter. Figure 4-20 below illustrates these two different characteristics of the MST BPDU frame:
Fig. 4-20. MST BPDU Fields
The . . .
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