Loop-protection and MSTP

This topic shows that MSTP and loop-protection can be used to protect against loops. The following two figures show a download link failure of VSX LAG to BPDU tunneling.

Physical view of downlink failure of a VSX LAG to BPDU tunnelingPhysical view of downlink failure of a VSX LAG to BPDU tunneling

Logical view of failure of downlink of a VSX LAG to BPDU tunnelingLogical view of downlink failure of a VSX LAG to BPDU tunneling

With the loop-protect feature activated on Agg-1 and Agg-2 and MSTP, the loop is detected and one of the VSX LAGs is brought down, isolating access switch SW2 shown in the following figures.

Physical view of MSTP preventing loopsPhysical view of MSTP preventing loops

Logical view of MSTP preventing loopsLogical view of MSTP preventing loops