Re: [OSL | CCIE_Security] GRE Fundamentals

youtube?

http://www.youtube.com/results?search_query=cisco+gre+&search_type=&aq=f

Not sure how helpful these are, however there were some videos on youtube.
I liked the documentation myself, there are also some tech notes posted
along with the docs.

If you have a specific question, ask it here as the folks (barring me) are
pretty smart. HTH

Andrew Lee Lissitz

On Thu, Oct 8, 2009 at 10:38 PM, Roger Cheeks
<roger.cheeks_at_googlemail.com>wrote:

> Hello TL,Here are a couple links I think are useful. It is also important
> to note that a GRE tunnel interface status is only local significant on a
> router. As long as the tunnel interface has viable source and destination
> info, the router will mark the tunnel as up. The formation of the tunnel
> is
> stateless which is my guess as to why you don't see a lot of information
> about how a GRE tunnel is formed from an router to router communication
> perspective.
>
> http://en.wikipedia.org/wiki/Generic_Routing_Encapsulation
> http://www.faqs.org/rfcs/rfc2784.html
>
> I hope this info is useful.
> Regards,
> Roger
>
> On Thu, Oct 8, 2009 at 10:09 PM, TL <tarun.ccie_at_gmail.com> wrote:
>
> > Hi there,
> >
> > Is there a document/video that explains the working of GRE in detail. The
> > different steps that happen when a packet destined for the GRE tunnel is
> > created to the stage when it reaches it's destination.
> >
> > I read the RFP 1701, 1702 on GRE but that does not goes into this detail,
> > neither did I find it in any other text.
> >
> > Can someone please provide some pointers as I feel deep understanding of
> > GRE is very important for VPN/DMVPN stuff.
> >
> > Regards,
> > TL
> >
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-- 
Andrew Lee Lissitz
all.from.nj_at_gmail.com
Blogs and organic groups at http://www.ccie.net