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(iNE jingle)

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- In this video, I'd like to talk about

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a very useful tool within GNS3.

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It's an optional tool,
but it, like I said,

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can be very useful to you,
called the Snapshot tool.

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So first of all, let
me paint you a picture.

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Let's start with a basic GNS3 topology,

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such as this one.

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I'll zoom in on this here.

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So, let's say my objective
here is to practice EIGRP,

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maybe by itself, then
practice OSPF by itself,

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and then maybe practice
the redistribution of EIGRP

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into OSPF and just basically use

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this simple topology here and make

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multiple permutations to it,
change it multiple times.

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And here's what I'm thinking.

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I'm thinking that maybe once I start out,

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maybe I just want to start
with a simple topology

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of just IP addresses and that's it.

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And then later on, add on EIGRP to that,

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but at some point in time,
I might want to go back

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to that initial topology
where everything was connected

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and all it had was IP addresses.

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Go back to the time before it had

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any routing protocols configured.

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And also, maybe after I
initially create EIGRP

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and I have that running,
maybe in the future

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I want to go back to that.

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Maybe in the future, after
I've got OSPF and EIGRP

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redistribution working
just fine, I say to myself,

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okay, I'd like to go back to them time

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when I didn't have OSPF.

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When I had all my IP addresses,
when I had EIGRP working,

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but before I had all my OSPF.

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In other words, I want to have the ability

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to go back and forth in time
between different topologies

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to be able to play around
with adding things,

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changing things, and that is
what Snapshots are used for.

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Where, within a project,
you want to be able

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to go back and forth in time between

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what that project looked like
at various states in time.

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Now, one of the things
you might be wondering,

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because this was a question
that came up with me was,

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well, why don't I just
create multiple projects.

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In other words, why
don't I have one project

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that is simply this topology

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with nothing but the IP addresses in it,

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and then why don't I create
another project that has

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this topology with the IP
addresses and EIGRP in it,

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and then maybe a third
project that has this, EIGRP

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and OSPF running, and then if I wanna just

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go back and forth, I'll just open up

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different project files to do that.

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Why would I use the Snapshot tool

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instead of just using multiple projects?

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Well, here's the reason why.

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Basically, at a high
level, it comes down to

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memory consumption, that's
what it boils down to.

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For example, look here in my folder

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where my projects are located.

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My users, my name, GNS3 and projects.

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And you can see, right now

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I've just got four projects in here.

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Well, if I click on one, just select it,

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and then I right click and hit properties,

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notice that one project,

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524 megabytes of memory for that.

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Okay, what about the next project?

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Right click, properties,

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once again 532 megabytes of memory.

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So this is the downside of using,

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or I should say creating multiple projects

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if all you wanted to do
was go back and forward

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with the same topology,

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but adding different
stuff to that topology,

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or changing the topology.

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It's gonna eat up tons of
memory in your laptop or PC

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if the way you're doing that

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is by creating multiple projects.

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This is where the Snapshot
tool is really beneficial,

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'cause everything within the snapshot

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stays within this one project.

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As an example, just let me go ahead

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and close this right here.

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So in this particular
topology, I have so far

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created two snapshots.

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The first snapshot was just IP addressing,

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and that was it.

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All the links are up, IP
addressing was configured,

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nothing else was configured.

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So, let's go back to that one.

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So, and then I'll show you how to actually

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create new snapshots.

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So, the first thing I'm gonna show you is,

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if you've already got a snapshot running,

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how do you go back to it?

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In other words, if you've
created a snapshot in the past,

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how do you revert back to that snapshot?

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So let's say that right now, this topology

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actually was running EIGRP,
it actually was running OSPF,

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there's all sorts of authentication

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and other fun stuff in here, I say, okay,

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I'm done with that.

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Now I wanna go back to my
real primitive topology

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that all it had on it was
IP addressing that's it.

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So, step number one, and
this is the critical thing,

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when using the Snapshot tool to either

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create a new snapshot or to restore back

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to what a previous snapshot looked like,

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main thing to remember,
all of your devices,

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all of your routers and ethernet switches

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have to be turned off.

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So anything that's running Cisco IOS,

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don't worry about the built-in nodes

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like Cloud and Host and all that stuff,

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but anything that's running IOS,

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your etherswitch modules and your routers,

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has to be in the off state.

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If you try to create a new project

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while routers are currently running,

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or if you try to revert
back to an old project

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while stuff is currently running,

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you're gonna have unpredictable results.

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A lot of times, what I've seen is that

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it just doesn't work.

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It takes you right back to
the same place where you were

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before you went into Snapshots.

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So make sure that all of your
IOS devices are turned off

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before using Snapshot in
any way, shape or form.

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So, now I want to revert
back to an old snapshot,

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so, number one, stop all my devices.

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Now that they're all stopped,

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go up to this tool right here.

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This is the, as you can
see, Manage Snapshots tool.

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And you're gonna wanna click on that.

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And you can see, in
this particular project,

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I've already created two snapshots,

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so I'm gonna click on
the one, and you can see,

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when you create a snapshot you,

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you're gonna wanna give it
some sort of descriptive name

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so you can remember what
your topology was like,

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what it was doing at that point in time.

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So I'm gonna click on IP addressing only

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and I'm gonna click on restore.

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And it warns you, it says
okay, if you do this,

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anything that's currently
in your running config

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that hasn't been saved is gonna be gone,

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it's gonna be wiped out.

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I say yeah, okay, well that's
actually what I wanna do,

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I wanna wipe out the current state

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and revert back to the previous state.

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Okay, so here I am, now actually, if my,

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probably what I should have done

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is when I first started this,

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I probably shouldn't have
labeled in like EIGRP and OSPF,

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I probably, when I created the snapshot,

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it probably would have made more sense

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just to have the actual
picture look like the routers,

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the links, and the IP addresses,

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'cause right now, looking at this,

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I know it kinda looks confusing, like,

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well, wait a second, is he
still running EIGRP and OSPF?

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No, I'm not, and here's
how I can show you.

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I'll go ahead and start everything up.

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Alright, now it's running.

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Now, I'm just gonna get
into one of my devices.

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Let's say R2.

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And the way I know that the snapshot

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worked the way that I reverted back,

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is that when this device comes up,

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if I do show ip interface brief,

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actually, let me go ahead
and just make the font size

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a little bit larger for you guys,

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so you can read it a little
bit easier on the video.

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There we go.

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show ip interface brief.

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So you can see, right now,
my IP addresses are there,

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it remembered that at the
time I took this snapshot

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those interfaces were
actually up up and connected,

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and if I do show ip protocols,
you can see there's nothing.

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So right now, this is before I configured

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any routing protocol at all.

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All I had were IP addresses.

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Now let's go ahead and close this window.

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And now I say, okay, well
what I'd like to do now

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is move forward in time.

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I wanna go forward in time to
when I created the snapshot

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when my EIGRP was up and functional.

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Okay, click stop.

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Stop everything.

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Go to the Snapshot button again.

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Select the snapshot that
you previously created,

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and restore.

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Once again, you get the warning.

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Alright, everything should be back,

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so now let's start everything up again.

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So, how do I know that worked?

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How do I know that it restored me

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back to that point in time when,

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not only the IP addresses were here,

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but I had also configured EIGRP.

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Well, once again, let's just

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double-click on a router, R2 here.

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Show ip interface brief,

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verify that my IP addresses
are still there, yep.

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And now show ip protocols,

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and you can see, I've got EIGRP running.

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Show ip eigrp neighbor,

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I have an EIGRP neighbor.

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So it now brought me
to that point in time.

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So now let's take it one step further.

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Let me show you how to
create a brand new snapshot.

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So in order to do this,

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I'm gonna take up, with
my existing topology,

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and now I'm gonna configure
just a basic OSPF adjacency

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between R2 and R3.

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So let's bring up R3 here.

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Alright, so let's start with R2,

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router ospf 1

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network, and in this particular case,

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it's gonna be the 2.3.2 network.

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And that's gonna be in area zero.

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And that's all I'm gonna do,

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I'm not gonna do any
redistribution right now,

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I'm just gonna get my
EIGRP up and working.

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Now, notice once thing I did,

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which is just very, very important.

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I'll zoom in on this.

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In this particular case,

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I issued the write memory command.

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It's kind of abbreviated here,
but I could also have issued

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the copy run start command.

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Why is that important?

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Because when you take the
snapshot, when you create it,

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at that moment in time,
it takes a snapshot

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of the current saved configuration,

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the startup configuration of your devices.

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It does not take a snapshot
of your running configuration.

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So if you have a running configuration

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with any unsaved changes,

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they will not be a part of your snapshot.

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So make sure you save all your configs

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with copy run start or write
memory, whichever you prefer,

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then make sure you shut
down all your routers,

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power them off, and
then take the snapshot.

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Alright, so.

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So I saved my configuration here,

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so now let's go into,
I'm done with Router 2,

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let's go into the other router.

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And actually, before I do this,

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I will just copy that part
of my OSPF configuration

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so I can just copy and paste it.

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Make life easy for myself.

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Alright, now let's get
into the other router.

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00:11:46,568 --> 00:11:48,571
Paste all that stuff in.

256
00:11:48,571 --> 00:11:51,655
Ah, it didn't work, okay, so

257
00:11:51,655 --> 00:11:53,655
let's go back over here.

258
00:11:57,274 --> 00:11:58,274
There we go.

259
00:12:01,469 --> 00:12:04,403
So we should see now, OSPF
takes a little bit longer than

260
00:12:04,403 --> 00:12:07,218
EIGRP to do its stuff, but, there we go.

261
00:12:07,218 --> 00:12:10,088
Now the OSPF adjacency is up.

262
00:12:10,088 --> 00:12:11,838
Show ip ospf neighbor

263
00:12:13,563 --> 00:12:14,733
Great, now I have to remember

264
00:12:14,733 --> 00:12:18,503
to save the configuration in this guy.

265
00:12:18,503 --> 00:12:20,907
Alright, so now I've
saved the configuration

266
00:12:20,907 --> 00:12:22,507
in both routers,

267
00:12:22,507 --> 00:12:26,090
I will shut this terminal
application down.

268
00:12:27,030 --> 00:12:29,874
I will turn off my routers.

269
00:12:29,874 --> 00:12:34,030
And now, once again, I'll
go to the Snapshot tool,

270
00:12:34,030 --> 00:12:37,522
and this time I'll select Create.

271
00:12:37,522 --> 00:12:39,724
And I'll give it a name.

272
00:12:39,724 --> 00:12:40,641
OSPF-EIGRP-

273
00:12:44,012 --> 00:12:45,262
No-Redistribute

274
00:12:46,803 --> 00:12:48,917
That's just my name.

275
00:12:48,917 --> 00:12:51,250
It saves it, and I close it.

276
00:12:53,383 --> 00:12:55,683
Now, where does it actually
save these snapshots,

277
00:12:55,683 --> 00:12:58,758
you might be wondering, are
these snapshots gonna be good

278
00:12:58,758 --> 00:13:01,799
even after I close this project
and completely walk away,

279
00:13:01,799 --> 00:13:03,421
what if I close my laptop?

280
00:13:03,421 --> 00:13:05,386
Are the snapshots still in there?

281
00:13:05,386 --> 00:13:07,003
Yes, they are, and here's how we can see.

282
00:13:07,003 --> 00:13:11,170
So everything's closed, let's
go ahead and quit from GNS3,

283
00:13:14,144 --> 00:13:18,311
and now I'll go into my file
where all of my GNS3 stuff is.

284
00:13:21,136 --> 00:13:23,053
Here's Projects.

285
00:13:23,053 --> 00:13:25,425
So, I'll select that Snapshot Test,

286
00:13:25,425 --> 00:13:29,640
that's the one I was doing,
and under Project Files,

287
00:13:29,640 --> 00:13:34,005
you can see right there, it has
a category called snapshots.

288
00:13:34,005 --> 00:13:35,756
And if I double-click on that,

289
00:13:35,756 --> 00:13:39,339
there are all the
snapshots that I created.

290
00:13:40,908 --> 00:13:43,242
So now let's go ahead and,

291
00:13:43,242 --> 00:13:45,081
and notice, if I go back
to the Project file,

292
00:13:45,081 --> 00:13:47,374
that's all contained
within that one project,

293
00:13:47,374 --> 00:13:51,541
so that one project now, that
has multiple snapshots in time

294
00:13:53,119 --> 00:13:54,618
it exceeded the size a little bit,

295
00:13:54,618 --> 00:13:56,437
you know, the other projects were like

296
00:13:56,437 --> 00:13:59,498
500 and something megs, now
in this particular case,

297
00:13:59,498 --> 00:14:02,599
we're up to 799 megabits, but still,

298
00:14:02,599 --> 00:14:05,512
that's a lot less memory
than if I had created

299
00:14:05,512 --> 00:14:08,438
three or four separate projects,

300
00:14:08,438 --> 00:14:12,022
rather than three or four snapshots.

301
00:14:12,022 --> 00:14:12,855
So, okay.

302
00:14:13,760 --> 00:14:17,927
So now let's go back to
GNS3 and start it up again.

303
00:14:20,213 --> 00:14:22,296
I will open that project.

304
00:14:28,732 --> 00:14:31,015
Now, by default, when
you open the project,

305
00:14:31,015 --> 00:14:35,182
GNS3 will open it to the most
recent snapshot that you took.

306
00:14:36,293 --> 00:14:38,194
So right now, it should have opened it

307
00:14:38,194 --> 00:14:42,399
to my EIGRP OSPF snapshot,
'cause that was the very last

308
00:14:42,399 --> 00:14:45,185
one that I took before
I shut everything down.

309
00:14:45,185 --> 00:14:47,376
Let's confirm that.

310
00:14:47,376 --> 00:14:50,450
So, I'lljust open up R2 and, if I'm right,

311
00:14:50,450 --> 00:14:53,783
R2 should now be running EIGRP and OSPF.

312
00:15:05,374 --> 00:15:07,624
And here's how we can tell.

313
00:15:09,063 --> 00:15:10,896
Show ip eigrp neighbor

314
00:15:12,063 --> 00:15:14,032
Yep, I have an EIGRP neighbor.

315
00:15:14,032 --> 00:15:16,533
Show ip ospf neighbor

316
00:15:16,533 --> 00:15:19,548
And there's my OSPF neighbor.

317
00:15:19,548 --> 00:15:21,902
I say, okay, well, I
wanna go back in time when

318
00:15:21,902 --> 00:15:23,642
all I had were IP addresses.

319
00:15:23,642 --> 00:15:25,835
Maybe I wanna get rid of EIGRP and OSPF

320
00:15:25,835 --> 00:15:29,072
and I wanna configure RIP and BGP.

321
00:15:29,072 --> 00:15:33,092
Okay, well, rather than
unconfiguring everything,

322
00:15:33,092 --> 00:15:36,125
I will just stop all my routers,

323
00:15:36,125 --> 00:15:38,611
go to my Snapshot tool,

324
00:15:38,611 --> 00:15:41,028
go to my very first snapshot,

325
00:15:41,869 --> 00:15:42,702
restore,

326
00:15:47,543 --> 00:15:51,211
alright, now start 'em all up again.

327
00:15:51,211 --> 00:15:54,628
And now when I go into R2, we should see,

328
00:15:55,607 --> 00:15:59,357
let me make this a little
bit larger for you,

329
00:16:06,358 --> 00:16:08,134
so now, because I went
to my first snapshot,

330
00:16:08,134 --> 00:16:11,699
if I do show ip protocol, I have nothing.

331
00:16:11,699 --> 00:16:14,117
But if I do show ip interface brief,

332
00:16:14,117 --> 00:16:16,534
I still have my IP addresses.

333
00:16:18,075 --> 00:16:21,902
And that is how you use the Snapshot tool.

334
00:16:21,902 --> 00:16:24,319
(iNE jingle)