[149857] in North American Network Operators' Group
RE: Common operational misconceptions
daemon@ATHENA.MIT.EDU (Holmes,David A)
Thu Feb 16 14:42:11 2012
From: "Holmes,David A" <dholmes@mwdh2o.com>
To: John Kristoff <jtk@cymru.com>, "nanog@nanog.org" <nanog@nanog.org>
Date: Thu, 16 Feb 2012 11:41:17 -0800
In-Reply-To: <20120215144715.18e65a55@w520.localdomain>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
With telcos increasingly implementing Metro Ethernet Forum (MEF) networks, =
I have found that telco technicians tasked with maintaining and operating t=
hese 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 tre=
e convergence that took their primary and back-up links down during converg=
ence, but that "this is no big deal because the network was only down for 2=
0-30 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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