H12-821_V1.0 · Question #809
In the MSTP protocol, each MSTI uses the RSTP algorithm independently to calculate a separate spanning tree.
The correct answer is A. TRUE. A is correct because MSTP (IEEE 802.1s) was specifically designed to map multiple VLANs to distinct spanning tree instances (MSTIs), each of which runs the RSTP algorithm independently to compute its own topology. This allows different VLANs to have different root bridges and…
Question
Options
- ATRUE
- BFALSE
How the community answered
(36 responses)- A81% (29)
- B19% (7)
Explanation
A is correct because MSTP (IEEE 802.1s) was specifically designed to map multiple VLANs to distinct spanning tree instances (MSTIs), each of which runs the RSTP algorithm independently to compute its own topology. This allows different VLANs to have different root bridges and active paths, enabling load balancing across links.
B is wrong because MSTP does not use a single shared spanning tree for all instances - that would defeat its purpose. A single spanning tree (like classic STP) can't load-balance traffic across redundant links because only one tree topology exists for all VLANs.
Memory tip: Think of MSTP as "RSTP with parallel lanes." Each MSTI is its own RSTP highway running independently - same algorithm, separate calculation, separate result. The "M" in MSTI stands for Multiple, reminding you that multiple independent trees coexist.
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