RE: Common operational misconceptions

["Holmes,David A" <dholmes () mwdh2o com>]

With telcos increasingly implementing Metro Ethernet Forum (MEF) networks, I have found that telco technicians tasked 
with maintaining and operating these carrier Ethernet networks appear to disregard common high availability practices. 
For instance, after diagnosing a routing protocol neighbor flap (consistently 20-30 seconds) and isolating the problem 
to the carrier MEF network, the carrier technician told me that the problem was a spanning tree convergence that took 
their primary and back-up links down during convergence, but that "this is no big deal because the network was only 
down for 20-30 seconds".

-----Original Message-----
From: John Kristoff [mailto:jtk () cymru com]
Sent: Wednesday, February 15, 2012 12:47 PM
To: nanog () nanog org
Subject: Common operational misconceptions

Hi friends,

As some of you may know, I occasionally teach networking to college
students and I frequently encounter misconceptions about some aspect
of networking that can take a fair amount of effort to correct.

For instance, a topic that has come up on this list before is how the
inappropriate use of classful terminology is rampant among students,
books and often other teachers.  Furthermore, the terminology isn't even
always used correctly in the original context of classful addressing.

I have a handful of common misconceptions that I'd put on a top 10 list,
but I'd like to solicit from this community what it considers to be the
most annoying and common operational misconceptions future operators
often come at you with.

I'd prefer replies off-list and can summarize back to the list if
there is interest.

John


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