Jeremy IT LAB MSTP Inaccuracy?
Hi all,
Let's focus on this topology. Specifically, let's take at look at Region34 (in blue).
Jeremy says: "in MSTP, only the IST, that is MST instance 0, send BPDUs."
However, I'm not sure about this. Indeed, SW4, which is not the designated bridge for MSTI 0, sends BPDUs to SW3 since it is the designated bridge on the segment SW3 <> SW4 for MSTI 2.
So what's the point of what Jeremy says?
Maybe he means that for inter-region communication then the BPDUs refer to the IST instance (MSTI 0). This is coherent with the lab, in fact, if I sniff the STP traffic between SW1 and SW3 I see that SW1 actually sends BPDUs to SW3 related to the IST with the addition of an extension for the other instances. It's as if Jeremy meant that instance zero is the "carrier" of information between regions.
I love Jeremy and his explanations but here it's not very clear here :(
Thx
