This is my first quiz and I chose an MSTP misconfiguration scenario that could be easily overlooked on the first encounter.
A fiber got cut revealed some hidden MSTP implementation problems. It was enough for one link to go down and the connectivity got impacted in a network that was supposed to be redundant. Read along and try to spot the problem.
Portfast + bpdufilter (used together) can be enabled globally or at interface level.
Although the first impression is that the only difference is the global or per-interface effect, this is not entirely true and another subtle and important difference is described in this post.