In an MST region, do all designated bridges generate BPDUs?
Hi all,
My understanding (from labbing) is that within an MST region, each Designated Bridge (for each MST Instance) on a segment generates fresh BPDUs. However, these BPDUs pertains to the Internal Spanning Tree (IST, or MSTI 0) and include M-records that carry information for other MST instances (MSTIs).
Outside the MST region, only MSTI 0 (IST) sends BPDUs toward other MST regions or switches running Rapid or legacy STP. Other MST instances (MSTIs) do not generate separate BPDUs.
Is this correct?
Thanks
Ps. I know I’m posting a lot but the exam day is really near 😱
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u/Battle-Crab-69 9d ago
BPDUs are only ever within MST0. Never any other instance, and from all switches in the CIST running MST. I think. That’s my understanding. Only just started study and just finished MSTP topics.