From: Bruce Evry (bruceco@xxxxxxxxxx)
Date: Wed Feb 06 2002 - 14:39:32 GMT-3
Dear Cael,
I was looking through the solution to the "Darth Reid" lab and
noticed the same use of the IP ospf network command.
The Skyline lab is fairly simple and the default (which normally
does not show when you do a show run) for frame relay physical interfaces
(and multipoint sub-interfaces) is "ip ospf network nonbroadcast".
(how did the author get that to show up in the configs?)
On careful reading of the "Darth" OSPF and Frame section, the
author tells you not to use the "ip ospf network" command, but it is under
the section about routers R1, R3, and R4 which are on the same subnet.
The link between R1 and R2 (in his solution) is a point-to-point
sub-interface on R1 and thus needs to have an explicit "ip ospf network
nonbroadcast" command in order to talk to the physical interface on R2.
Of course, you have to interpret the sections separately and
understand that whatever is not specifically prohibited under the exact
section is therefor permitted.
Another example, the frame link between R1 and R2 is supposed to
be running IGRP, but the author also shows it running OSPF on R2. (I guess
that'd make it easier to ping, eh?) Again, it is not prohibited...
Reading is part of any test, but doesn't this seem excessively
legalistic in nature? I am considering trying the Bar exam next :)
Just remember - the only thing that counts is the letter of the
law. (see Enron for details)
On the other hand - mistakes do happen in any book, even with lots
of proof-reading. My copy of the solution seems to be missing the BRI0
interface over on R5. Not sure how ISDN would work without an interface?
Yours Truly - Bruce Evry
PS - I"ve been thinking about the various NDA messages we've had recently
and I figure that anything that Cisco puts into a book that you can buy at
any bookstore is fair game for public discussion. (you could expand that
to include things taught by Cisco at seminars, classes, on their website,
and any general discussion of the technologies involved in doing routing
and switching. They can not fairly well sue people for discussing the same
topics that they discuss themselves.
On Wed, 6 Feb 2002, Cael Phelan wrote:
> Hi All,
>
> In this first lab of the book 'CCIE Practical Studies', the directions clearl
y
> state:
> 'Do not use the 'ip ospf network' command when configuring OSPF'
> yet the solution as provided by Cisco press uses this command everywhere. Ye
s
> indeed, 'ip ospf network non-broadcast' will give a hello time of 60 seconds
> but without using this command, you would have to enter 'ip ospf
> hello-interval 60' on the serial interface of R3 as directed and on the other
> routers R1 and R2 to peer. The 'ip ospf network' command is even used on the
> LAN interfaces according to the solution Am I missing something here and are
> the remaining four labs' solutions as bad?
>
> Many thanks,
>
> Carl
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