Common operational misconceptions

Kenneth M. Chipps Ph.D. chipps at
Thu Feb 16 06:00:04 UTC 2012

"ISIS is used in organizations other than ISPs" Any examples you can share
of some other than ISPs?

-----Original Message-----
From: Joel jaeggli [mailto:joelja at] 
Sent: Wednesday, February 15, 2012 11:58 PM
To: Kenneth M. Chipps Ph.D.
Cc: nanog at
Subject: Re: Common operational misconceptions

On 2/15/12 21:04 , Kenneth M. Chipps Ph.D. wrote:
> How widespread would you say the use of IS-IS is?
> Even more as to which routing protocols are used, not just in ISPs, 
> what percent would you give to the various ones. In other words X 
> percent of organizations use OSPS, Y percent use EIGRP, and so on.

Using EIGRP implies your routed IGP dependent infrastructure is a
monoculture. That's probably infeasible without compromise even if you are
largely a Cisco shop.

ISIS is used in organizations other than ISPs.

> -----Original Message-----
> From: Antti Ristimäki [mailto:antti.ristimaki at]
> Sent: Wednesday, February 15, 2012 10:47 PM
> To: John Kristoff
> Cc: nanog at
> Subject: Re: Common operational misconceptions
> "IS-IS is a legacy protocol that nobody uses"
> 15.02.2012 22:47, John Kristoff kirjoitti:
>> 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
>> 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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