Unlike PVST+, in which all STP instances are independent, or CST, where only a single STP instance exists, MST establishes and maintains the following two types of STP instances:
- Internal Spanning Tree (IST)
- Multiple Instance Spanning Tree Protocol (MISTP)
These two instances are described in the following sub-sections.
Internal Spanning Tree (IST)
The MST Region sees the outside world via its Internal Spanning Tree (IST) interaction only; the IST presents the entire MST Region as a single virtual bridge to the outside world. Therefore, BPDUs are exchanged at the Region boundary . . .
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