From: Brian Lodwick (xpranax@xxxxxxxxxxx)
Date: Sat Sep 08 2001 - 18:38:14 GMT-3
Thanks for the reply Brian but in my e-mail I didn't refer to CLIP's
relation to CLNS. I referred to CLNP's relation to CLNS and if you read
what I said from the information I learned about ISO CLNS, that "CLNS
provides network layer services to the transport layer via CLNP" and "the
CLNP address format is also known as an NSAP address", you'll see that from
what I've gathered CLNP is in fact related to CLNS and that's why I asked.
Also I work at UUNET and we do use ISIS and I realize that as you said "Its
a very strong IGP, and its deployed in some very large networks out there"
but I'm scheduled to take the lab exam the end of November and as I'm sure
you are aware there are already a lot of things to learn and if I'm not
going to be tested on IP ISIS or ATM Classical IP I'm not going to take the
extra time to learn every little caveat of them. ATM LANE and Appletalk are
also deployed in a lot of networks out there, but I'm not going to take the
time to make sure I know the steps to attaining appletalk convergence or how
a LEC joins an ELAN since ATM LANE and Appletalk were removed from the lab
exam content.
Thanks,
Jeff Lodwick
>From: Brian <signal@shreve.net>
>Reply-To: Brian <signal@shreve.net>
>To: Brian Lodwick <xpranax@hotmail.com>
>CC: <ccielab@groupstudy.com>
>Subject: Re: What all was removed from the lab with ISO CLNS?
>Date: Sat, 8 Sep 2001 08:00:22 -0500 (CDT)
>
>CLIP uses NSAP's yes, but that has nothing to do with CLNS........CLIP
>doesn't use CLNS. I would know CLIP if I were you, in the whole scope of
>CCIE topics, CLIP is an easy on to cover.
>
>As far as ISIS, I have no idea if its in the lab or not, but I would know
>it. Its a very strong IGP, and its deployed in some very large networks
>out there (uunet?). Its very possible it could pick up momentum and gain
>an even wider audience........on the lab or not, ISIS is something you
>want to be clued in on IMHO.
>
>Brian
>
>On Fri, 7 Sep 2001, Brian Lodwick wrote:
>
> > Does anyone know everything that was removed from the lab with the
>removal
> > of ISO CLNS. Most importantly I would like to know if ATM Classical IP
>and
> > ISIS for IP have been removed since they both use NSAP addresses. The
> > reason I ask is because of the following information I've learned about
> > CLNS:
> >
> > Cisco Documentation of OSI Protocols states "CLNS provides network
>layer
> > services to the transport layer via CLNP" and "CLNP is an OSI
>network-layer
> > protocol that carries upper-layer data and error indications over
> > connectionless links. CLNP provides the interface between the
>Connectionless
> > Network Service (CLNS) and upper layers." Caslow's book states that
>"The
> > CLNP address format is also known as an NSAP address". Does this then
>mean
> > that anything that uses NSAP addresses (like ATM Classical IP and ISIS
>for
> > IP) has been removed from the lab? According to Jeff Doyle's Volume 1
>book
> > "Even when IS-IS is used to route only TCP/IP, IS-IS is still an ISO
>CLNP
> > protocol. The packets by which IS-IS communicates with its peers are
>CLNS
> > PDUs, which means that even in an IP-only environment, an IS-IS router
>must
> > have an ISO address. The ISO address is a network address, a NET,
>described
> > in ISO 8348." Thanks in advance.
> >
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