I was just running through some self made scenarios. I was reading about "Flex Links" and what they are and how they work. Essentially it's a pair of links such as port channel or physical that back each other up in case of failure.
I had a very nice MST (multiple spanning tree) and PVST environment up and running.
The SECOND I configured Flex links - poof! Broke EVERYTHING. The links where I configured flex links went into forwarding state and caused massive loops. Options like preemption bandwidth, delay etc along with MANUAL Vlan pruning are essential to really working with flex links.
This was BRAND NEW to me, I never even heard of a flex link until 30 minutes ago. I read about it, configured it then tried to validate it and well, it taught me a lesson.
It's within scope for the CCIE RS lab, so I can already tell this is something that one can get in a LOT of trouble REALLY fast if they are not aware of what can happen.
Neato.
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