The significant majority of Cisco trained networking geeks have a mental block in understanding layer 2. They drink the koolaid that all solutions have to be exclusively layer 3 with layer 2 being bypassed, or put alternatively, every ethernet port must be a router port! This bias emanates from Cisco being bad at layer 2 and having to on-board switching by acquisition, starting with, if memory serves me right, with Kalpana! Basically, they don’t get it. Ironically, Cisco does ship decent switches and configured correctly they work like a charm. The root cause of problems is human bias and interference. Probably the underlying cause for the significant majority of ISP outages!
Read the article over at Medium over here.