1
00:00:03,419 --> 00:00:05,752
(whooshing)

2
00:00:08,874 --> 00:00:11,742
- So this video which is
continuing our discussion about

3
00:00:11,742 --> 00:00:14,061
making sure you select
an iOS software image

4
00:00:14,061 --> 00:00:17,073
that will fit your needs within GNS3.

5
00:00:17,073 --> 00:00:18,284
The next thing we're gonna talk about

6
00:00:18,284 --> 00:00:20,326
is memory considerations.

7
00:00:20,326 --> 00:00:22,238
Now, what do I mean by that?

8
00:00:22,238 --> 00:00:24,606
Cisco iOS software,
just like anything else

9
00:00:24,606 --> 00:00:27,102
that you download, whether
it be another web browser,

10
00:00:27,102 --> 00:00:29,881
or an email client, or an
instant messaging program,

11
00:00:29,881 --> 00:00:33,382
they all take up memory
within your laptop.

12
00:00:33,382 --> 00:00:35,352
And I'm presuming your
using some sort of laptop

13
00:00:35,352 --> 00:00:38,349
or possibly a server to run GNS3,

14
00:00:38,349 --> 00:00:41,855
and the memory that you have
available on your laptop

15
00:00:41,855 --> 00:00:43,255
is a constrained resource, right?

16
00:00:43,255 --> 00:00:45,979
You only have so much of it to go around.

17
00:00:45,979 --> 00:00:46,971
And this is something to think about

18
00:00:46,971 --> 00:00:49,589
when selecting a Cisco iOS software image

19
00:00:49,589 --> 00:00:50,736
for two reasons.

20
00:00:50,736 --> 00:00:53,965
Number one, we want to make
sure, if we have a choice,

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00:00:53,965 --> 00:00:55,992
once again you might not have a choice,

22
00:00:55,992 --> 00:00:57,642
but if you have a choice among

23
00:00:57,642 --> 00:00:59,965
different images that you can use,

24
00:00:59,965 --> 00:01:03,465
if one image requires significantly larger

25
00:01:04,784 --> 00:01:07,904
memory to run than another image,

26
00:01:07,904 --> 00:01:10,065
it might be in your
best interest to select

27
00:01:10,065 --> 00:01:13,575
that other image that
requires less memory.

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00:01:13,575 --> 00:01:15,739
For number one for your laptop, right?

29
00:01:15,739 --> 00:01:17,217
It's gonna save memory on your laptop.

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00:01:17,217 --> 00:01:19,845
The more routers that
you have open and running

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00:01:19,845 --> 00:01:22,149
the more memory it's gonna
chew up on your laptop.

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00:01:22,149 --> 00:01:25,090
The more resources it's going to consume.

33
00:01:25,090 --> 00:01:26,986
Another thing about memory considerations,

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00:01:26,986 --> 00:01:28,626
is when you actually go to import

35
00:01:28,626 --> 00:01:32,199
the software image into GNS3 itself,

36
00:01:32,199 --> 00:01:35,249
part of adding a new
software image to GNS3,

37
00:01:35,249 --> 00:01:38,335
telling GNS3, this is what I want to use,

38
00:01:38,335 --> 00:01:40,829
part of that process is GNS3 will ask you,

39
00:01:40,829 --> 00:01:42,514
how much memory do you want to allocate

40
00:01:42,514 --> 00:01:46,300
for each router that's using the software?

41
00:01:46,300 --> 00:01:49,404
Now if you do too much
memory, it's not going

42
00:01:49,404 --> 00:01:51,978
to hurt the router but certainly
gonna hurt your laptop,

43
00:01:51,978 --> 00:01:54,540
because you're gonna run out
of memory that much faster.

44
00:01:54,540 --> 00:01:56,940
You won't be able to
create larger topologies.

45
00:01:56,940 --> 00:01:59,921
On the flip side, if you
allocate too little memory

46
00:01:59,921 --> 00:02:02,459
to that software, well now your routers

47
00:02:02,459 --> 00:02:04,707
might either not start up at all,

48
00:02:04,707 --> 00:02:06,226
or they might start up with a whole bunch

49
00:02:06,226 --> 00:02:08,462
of errors and trace back messages.

50
00:02:08,462 --> 00:02:11,958
Or, they might start up, they
might run for a little while,

51
00:02:11,958 --> 00:02:12,915
and then you go to turn on

52
00:02:12,915 --> 00:02:14,911
some new feature protocol and bang!

53
00:02:14,911 --> 00:02:17,506
Now you start getting trace
back messages and errors.

54
00:02:17,506 --> 00:02:19,981
So we want to make sure
that we're mindful of memory

55
00:02:19,981 --> 00:02:21,935
in those two circumstances.

56
00:02:21,935 --> 00:02:23,475
How much memory this particular image

57
00:02:23,475 --> 00:02:27,157
is gonna chew up in my laptop
every time I open up a router,

58
00:02:27,157 --> 00:02:30,827
and how much memory does
a software image take?

59
00:02:30,827 --> 00:02:32,675
How do I know the answer to that

60
00:02:32,675 --> 00:02:34,764
so when I'm importing it into GNS3

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00:02:34,764 --> 00:02:37,716
I can select the correct amount of memory.

62
00:02:37,716 --> 00:02:39,701
So let's look at these to begin with.

63
00:02:39,701 --> 00:02:42,510
So let's say that I had within,

64
00:02:42,510 --> 00:02:44,510
I had available to me...

65
00:02:48,069 --> 00:02:52,437
Let's say I had, so here
I have... I'm fortunate

66
00:02:52,437 --> 00:02:55,927
and I have several versions
of software available to me.

67
00:02:55,927 --> 00:02:58,917
So maybe I say okay let's
see, how about the 7200 here.

68
00:02:58,917 --> 00:03:00,815
I know there's lots of
different port adapters

69
00:03:00,815 --> 00:03:03,901
to go with 7200 so that's
gonna give me a lot of choices

70
00:03:03,901 --> 00:03:07,534
as far as what kinds of interfaces I want.

71
00:03:07,534 --> 00:03:09,825
Well, if I'm gonna use that,

72
00:03:09,825 --> 00:03:10,921
the first thing I'm gonna have to know

73
00:03:10,921 --> 00:03:13,928
is how much memory is
that going to consume?

74
00:03:13,928 --> 00:03:15,873
I don't know the answer to
that off the top of my head

75
00:03:15,873 --> 00:03:19,526
so I'll go back to our trusty
Cisco Feature Navigator

76
00:03:19,526 --> 00:03:21,359
and research software,

77
00:03:22,392 --> 00:03:27,031
and once again research
it by platform, and iOS

78
00:03:27,031 --> 00:03:30,796
because I know that this was a
7200 image I'm interested in.

79
00:03:30,796 --> 00:03:34,963
So for my platform I'll
find 7200 here in my list.

80
00:03:36,915 --> 00:03:39,157
Here we go, 7200.

81
00:03:39,157 --> 00:03:42,907
And that particular
image was mainline 12.233

82
00:03:46,483 --> 00:03:50,483
that's 12.233SRE, so let
me just zoom in on here

83
00:03:52,123 --> 00:03:53,785
in case you weren't able to see that.

84
00:03:53,785 --> 00:03:56,947
This is the image I'm looking
up right now, the 7200 series.

85
00:03:56,947 --> 00:04:00,864
12.233 SRE alright? So
let's just go down here.

86
00:04:01,926 --> 00:04:03,926
So 12.2 and here is SRE.

87
00:04:07,657 --> 00:04:10,657
And my particular one is 12.233SRE3.

88
00:04:13,326 --> 00:04:15,493
So 12.233SRE3 there we go.

89
00:04:17,886 --> 00:04:22,053
And the features that I have
is advanced enterprise k9.

90
00:04:23,921 --> 00:04:26,828
Here we go, advanced enterprise.

91
00:04:26,828 --> 00:04:29,661
Alright, so it tells me right here

92
00:04:30,573 --> 00:04:32,391
the minimum DRAM or Flash,

93
00:04:32,391 --> 00:04:33,593
mostly I'm concerned with DRAM

94
00:04:33,593 --> 00:04:34,880
because when this router is running

95
00:04:34,880 --> 00:04:36,329
it's DRAM memory that's going to be used

96
00:04:36,329 --> 00:04:38,496
for storing the iOS image,

97
00:04:39,692 --> 00:04:42,416
creating my arc tables and routing tables

98
00:04:42,416 --> 00:04:43,249
and all that stuff.

99
00:04:43,249 --> 00:04:45,401
So you can see, a single router

100
00:04:45,401 --> 00:04:50,143
is going to use up 512
megabytes of DRAM memory.

101
00:04:50,143 --> 00:04:51,304
That's a lot!

102
00:04:51,304 --> 00:04:54,283
So I better have a lot
of memory on my laptop

103
00:04:54,283 --> 00:04:56,576
to be able to handle that.

104
00:04:56,576 --> 00:04:58,140
Well you might be saying, well but Keith,

105
00:04:58,140 --> 00:05:01,131
I don't even know how much
memory I do have on my laptop,

106
00:05:01,131 --> 00:05:02,774
how do I figure that out?

107
00:05:02,774 --> 00:05:05,100
Well, what you can do is,

108
00:05:05,100 --> 00:05:06,647
now I'm just doing this based on Windows,

109
00:05:06,647 --> 00:05:08,594
of course if you're using a Mac or Linux,

110
00:05:08,594 --> 00:05:09,994
it'd be something different,

111
00:05:09,994 --> 00:05:13,251
but in Windows if you
click on your start button,

112
00:05:13,251 --> 00:05:14,495
and then somewhere in there you'll find

113
00:05:14,495 --> 00:05:16,878
Computer or possibly My Computer,

114
00:05:16,878 --> 00:05:20,913
and if you right click on
it and select Properties,

115
00:05:20,913 --> 00:05:23,755
you'll get a box that looks like this.

116
00:05:23,755 --> 00:05:25,648
And in my particular case, you can see

117
00:05:25,648 --> 00:05:27,123
that my particular laptop has

118
00:05:27,123 --> 00:05:30,206
basically about 8GB of RAM available.

119
00:05:32,643 --> 00:05:35,461
So if each one of those
7200 series routers

120
00:05:35,461 --> 00:05:37,446
was using about 500MB,

121
00:05:37,446 --> 00:05:41,465
that means just two routers are using 1GB,

122
00:05:41,465 --> 00:05:43,690
and remember the GNS3 application itself

123
00:05:43,690 --> 00:05:45,568
is going to consume some memory.

124
00:05:45,568 --> 00:05:48,033
And Windows is going
to consume some memory

125
00:05:48,033 --> 00:05:49,965
just to do the operating system, so,

126
00:05:49,965 --> 00:05:51,327
probably not gonna be able to have

127
00:05:51,327 --> 00:05:54,760
a whole lot of routers here
if I'm using the 7200 series.

128
00:05:54,760 --> 00:05:56,083
Well let's go ahead and try it.

129
00:05:56,083 --> 00:05:58,521
Let's see what that looks like.

130
00:05:58,521 --> 00:06:03,356
So I'll go now into GNS3,
I've got it open already.

131
00:06:03,356 --> 00:06:07,047
And this particular project
here is called just Test,

132
00:06:07,047 --> 00:06:09,664
so that we can reference it
later on, my Test project.

133
00:06:09,664 --> 00:06:12,664
And I'll go under Edit, Preferences,

134
00:06:14,053 --> 00:06:17,012
and then under dynamips
click on iOS Routers,

135
00:06:17,012 --> 00:06:20,006
and here is where you
actually add your iOS.

136
00:06:20,006 --> 00:06:22,098
I'll get into this in just
another video in a second,

137
00:06:22,098 --> 00:06:24,366
we're gonna go through the
whole walkthrough process

138
00:06:24,366 --> 00:06:27,559
about downloading the
software and setting stuff up.

139
00:06:27,559 --> 00:06:29,397
But just as sort of a little preview here,

140
00:06:29,397 --> 00:06:32,087
I'll go ahead and do New,

141
00:06:32,087 --> 00:06:35,878
and I'll find that iOS
image where it's located.

142
00:06:35,878 --> 00:06:37,795
Here it is. Click open.

143
00:06:39,126 --> 00:06:40,802
I'll say Yes, I want to decompress it.

144
00:06:40,802 --> 00:06:42,459
And don't worry if I'm
going a little fast for you

145
00:06:42,459 --> 00:06:43,738
because we're going to walk through

146
00:06:43,738 --> 00:06:45,206
all these steps coming up.

147
00:06:45,206 --> 00:06:47,702
The main reason I'm showing this to you

148
00:06:47,702 --> 00:06:48,535
is because I want to show you

149
00:06:48,535 --> 00:06:51,043
how much memory this thing uses.

150
00:06:51,043 --> 00:06:54,015
Now right here, Default RAM.

151
00:06:54,015 --> 00:06:55,767
Because I've already used GNS3

152
00:06:55,767 --> 00:06:57,966
several times before recording this video,

153
00:06:57,966 --> 00:07:00,473
and because I've used it with this image,

154
00:07:00,473 --> 00:07:03,520
it actually remembered
how much RAM it takes.

155
00:07:03,520 --> 00:07:04,353
You might be saying,

156
00:07:04,353 --> 00:07:05,676
oh it's smart enough to figure that out!

157
00:07:05,676 --> 00:07:06,715
No, it's not.

158
00:07:06,715 --> 00:07:08,214
When I did this the very first time,

159
00:07:08,214 --> 00:07:11,797
it defaulted to a RAM
size of about 128 Mb,

160
00:07:13,097 --> 00:07:15,390
which clearly, or Megabytes,

161
00:07:15,390 --> 00:07:17,347
which clearly would not be nearly enough.

162
00:07:17,347 --> 00:07:19,414
So just make sure that
this number right here

163
00:07:19,414 --> 00:07:21,036
is the same number that you found

164
00:07:21,036 --> 00:07:24,384
on the Cisco Feature Navigator.

165
00:07:24,384 --> 00:07:27,572
Now just a little word about that as well.

166
00:07:27,572 --> 00:07:29,067
So in this Cisco Feature Navigator,

167
00:07:29,067 --> 00:07:30,181
when it gives you that number like

168
00:07:30,181 --> 00:07:33,098
this image requires 512MB or 256MB,

169
00:07:34,987 --> 00:07:36,743
where they really come up with that number

170
00:07:36,743 --> 00:07:39,967
is they say if you had that
image running on your router,

171
00:07:39,967 --> 00:07:42,033
and you had everything going,

172
00:07:42,033 --> 00:07:43,485
every possible feature

173
00:07:43,485 --> 00:07:46,165
and every possible protocol
that this router could support,

174
00:07:46,165 --> 00:07:47,819
if they were all running,

175
00:07:47,819 --> 00:07:50,575
this is how much memory you would need.

176
00:07:50,575 --> 00:07:53,386
Now chances are, when you're
doing your GNS3 topology,

177
00:07:53,386 --> 00:07:56,477
you're not going to be having
every single thing running

178
00:07:56,477 --> 00:07:58,894
that the software could
potentially support.

179
00:07:58,894 --> 00:08:00,059
So in reality,

180
00:08:00,059 --> 00:08:02,332
when you're allocating
your memory right here,

181
00:08:02,332 --> 00:08:05,150
you probably could get away
with doing a little bit less

182
00:08:05,150 --> 00:08:07,987
than what the software actually requires.

183
00:08:07,987 --> 00:08:09,094
Which is kinda nice

184
00:08:09,094 --> 00:08:10,685
because if you were actually
loading this software

185
00:08:10,685 --> 00:08:14,140
on a real Cisco router,
it wouldn't even load

186
00:08:14,140 --> 00:08:16,765
if it didn't have that amount of DRAM.

187
00:08:16,765 --> 00:08:18,548
But here, because we're
emulating these routers,

188
00:08:18,548 --> 00:08:21,481
I could get away with a little
bit less if I wanted to.

189
00:08:21,481 --> 00:08:23,375
But for the purposes of this demonstration

190
00:08:23,375 --> 00:08:25,882
I'm just going to leave it
to match the same number

191
00:08:25,882 --> 00:08:29,483
that we saw in the Feature
Navigator and click next.

192
00:08:29,483 --> 00:08:31,665
I don't really care what
I'm populating this with,

193
00:08:31,665 --> 00:08:33,086
for the purposes of this demonstration

194
00:08:33,086 --> 00:08:34,457
that's not really relevant.

195
00:08:34,457 --> 00:08:39,166
So I'll just populate some
slots here, find an idle PC,

196
00:08:39,166 --> 00:08:40,895
and we'll talk about idle PC

197
00:08:40,895 --> 00:08:43,294
also coming up in a future video.

198
00:08:43,294 --> 00:08:46,175
This is basically a
way to ensure that GNS3

199
00:08:46,175 --> 00:08:48,295
and the emulated routers within it

200
00:08:48,295 --> 00:08:50,945
don't completely hog
and use up, as it says,

201
00:08:50,945 --> 00:08:52,945
100 percent of your CPU.

202
00:08:53,972 --> 00:08:56,525
Because if that happens then
your laptop will just freeze.

203
00:08:56,525 --> 00:08:58,250
And nothing will work.

204
00:08:58,250 --> 00:09:00,182
So computing this idle
PC gives us a number

205
00:09:00,182 --> 00:09:03,793
to prevent that kind of
situation from happening.

206
00:09:03,793 --> 00:09:05,609
And in just a couple of seconds here,

207
00:09:05,609 --> 00:09:09,931
we should get an idle PC value
for that particular software.

208
00:09:09,931 --> 00:09:13,147
And each software image is different.

209
00:09:13,147 --> 00:09:15,501
Right now I'm doing it for 7200 series,

210
00:09:15,501 --> 00:09:19,237
but even if I had another
7200 series software

211
00:09:19,237 --> 00:09:22,624
that was a different feature
set or a different version,

212
00:09:22,624 --> 00:09:24,639
it would come up with a
different idle PC value,

213
00:09:24,639 --> 00:09:26,498
they're all different.

214
00:09:26,498 --> 00:09:27,998
Okay, Finish.

215
00:09:27,998 --> 00:09:30,788
So now we can see the 7200
is available here for me.

216
00:09:30,788 --> 00:09:34,391
Alright, so let's just go
ahead and apply that. Okay.

217
00:09:34,391 --> 00:09:36,860
So let's just create
a real simple project.

218
00:09:36,860 --> 00:09:40,118
Now before I do anything, we can see that,

219
00:09:40,118 --> 00:09:42,407
if I bring this up.

220
00:09:42,407 --> 00:09:47,302
So what GNS3 does by default,
is within your C Drive,

221
00:09:47,302 --> 00:09:49,204
within your Users folder,

222
00:09:49,204 --> 00:09:50,849
and then your name, whatever it is,

223
00:09:50,849 --> 00:09:52,224
you'll see a GNS3 folder

224
00:09:52,224 --> 00:09:54,583
and then a subfolder called projects.

225
00:09:54,583 --> 00:09:58,357
And you can see that Test is in there.

226
00:09:58,357 --> 00:10:00,328
Now, right now, I have not

227
00:10:00,328 --> 00:10:03,124
added any routers to this project.

228
00:10:03,124 --> 00:10:04,366
There's really nothing running,

229
00:10:04,366 --> 00:10:06,648
so you can see when I just
hover over it that project,

230
00:10:06,648 --> 00:10:08,563
which is pretty much
doing nothing right now,

231
00:10:08,563 --> 00:10:10,396
is using about 74.2MB.

232
00:10:12,064 --> 00:10:13,951
Alright let's see how that number changes

233
00:10:13,951 --> 00:10:17,916
as I start pulling some
routers into my project.

234
00:10:17,916 --> 00:10:19,948
So let's go ahead and open this up

235
00:10:19,948 --> 00:10:22,979
and let's just pull a single 7200 series.

236
00:10:22,979 --> 00:10:24,971
Now, I haven't started it yet,

237
00:10:24,971 --> 00:10:27,104
this router is sort of like
in a powered down state,

238
00:10:27,104 --> 00:10:30,094
it's there in the image
but it's not running yet.

239
00:10:30,094 --> 00:10:32,171
Did that actually change
anything in my project,

240
00:10:32,171 --> 00:10:36,254
let's hover it over it
again, nope, still 74.2MB.

241
00:10:37,331 --> 00:10:41,096
Okay, so that hasn't changed anything.

242
00:10:41,096 --> 00:10:43,295
So let's just go ahead and add in,

243
00:10:43,295 --> 00:10:45,193
let's just start with that one router.

244
00:10:45,193 --> 00:10:47,888
So now I'm going to go
ahead and turn it on.

245
00:10:47,888 --> 00:10:50,735
Remember we were at 74.2MB before, right?

246
00:10:50,735 --> 00:10:53,762
Now the router's running,
one instance of a 7200.

247
00:10:53,762 --> 00:10:57,595
Now, instead of 74.2MB,
what are we up to now?

248
00:10:59,492 --> 00:11:03,804
Well, it still says 74.2, but
I find that highly suspicious.

249
00:11:03,804 --> 00:11:07,304
Let's go into our projects file, dynamips.

250
00:11:09,318 --> 00:11:12,360
And here we can see, okay, so we've got.

251
00:11:12,360 --> 00:11:15,655
Here's my iOS image, and we can see

252
00:11:15,655 --> 00:11:18,572
it's using roughly 262MB right now.

253
00:11:20,542 --> 00:11:22,010
Now this is called a ghost file

254
00:11:22,010 --> 00:11:23,332
and we can also see up here

255
00:11:23,332 --> 00:11:26,082
the input output memory of 262MB.

256
00:11:27,293 --> 00:11:31,043
That's one router! Let's
add a second router.

257
00:11:33,017 --> 00:11:35,165
Let's bring a second router
of the exact same type,

258
00:11:35,165 --> 00:11:36,926
7200 into the mix.

259
00:11:36,926 --> 00:11:38,426
I'm not going to connect them or anything,

260
00:11:38,426 --> 00:11:41,072
I'm going to go ahead
and start that guy up.

261
00:11:41,072 --> 00:11:42,072
Start. Okay?

262
00:11:44,237 --> 00:11:47,870
So let's go back. Now look at this!

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00:11:47,870 --> 00:11:51,361
Now we have, if I zoom
in on this a little bit,

264
00:11:51,361 --> 00:11:53,444
we have 262MB for 7200_i3

265
00:11:56,729 --> 00:11:59,229
and another 262MB for 7200_i2,

266
00:12:01,593 --> 00:12:03,212
so you can see it's starting to consume

267
00:12:03,212 --> 00:12:04,871
quite a bit more memory

268
00:12:04,871 --> 00:12:06,303
each time I open up a new router

269
00:12:06,303 --> 00:12:09,970
and I start it, it's
consuming another 262MB

270
00:12:10,808 --> 00:12:12,975
within my projects folder.

271
00:12:15,209 --> 00:12:18,852
Now once I go back and I stop these guys,

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00:12:18,852 --> 00:12:22,692
don't need them anymore, so stop them,

273
00:12:22,692 --> 00:12:26,859
go back to Users, and you
can see now those folders,

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00:12:28,473 --> 00:12:29,619
those files are gone.

275
00:12:29,619 --> 00:12:33,066
The only file that's left
is the ghost file of 262MB,

276
00:12:33,066 --> 00:12:35,988
but those other iO memory files

277
00:12:35,988 --> 00:12:39,083
that were consuming a lot are gone.

278
00:12:39,083 --> 00:12:41,717
Now you might be thinking, okay
is that going to be the case

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00:12:41,717 --> 00:12:43,575
with every router that I have?

280
00:12:43,575 --> 00:12:45,588
Well, not necessarily. For example.

281
00:12:45,588 --> 00:12:46,647
In this particular project

282
00:12:46,647 --> 00:12:50,581
let me go ahead and get
rid of these two routers.

283
00:12:50,581 --> 00:12:53,748
Delete, Yes. Right Click, Delete, Yes.

284
00:12:57,079 --> 00:13:01,685
Instead let's use a 3725 which
I already imported in here.

285
00:13:01,685 --> 00:13:04,435
Okay? Let's turn one of these on.

286
00:13:05,320 --> 00:13:08,903
Start. Let's go back
to my projects folder.

287
00:13:11,640 --> 00:13:16,286
Okay, let's refresh this
a little bit. Refresh.

288
00:13:16,286 --> 00:13:19,533
Okay so now at this point, if I zoom in,

289
00:13:19,533 --> 00:13:21,122
we can see that I have a ghost file.

290
00:13:21,122 --> 00:13:22,843
It always creates a single ghost file

291
00:13:22,843 --> 00:13:25,427
that sort of represents
that iOS image it's using.

292
00:13:25,427 --> 00:13:27,420
So whether you've got two routers

293
00:13:27,420 --> 00:13:28,753
or five routers or ten routers,

294
00:13:28,753 --> 00:13:31,432
there's going to be one ghost
file for that particular iOS.

295
00:13:31,432 --> 00:13:33,265
So there it is, 262MB.

296
00:13:35,261 --> 00:13:39,428
And let's see here, don't
really see any iO MEM file

297
00:13:41,590 --> 00:13:43,318
for the 3725.

298
00:13:43,318 --> 00:13:47,471
This is really the single
largest file right now.

299
00:13:47,471 --> 00:13:49,698
Now it also has the 7200 in here,

300
00:13:49,698 --> 00:13:50,786
that's sorta like a carry over

301
00:13:50,786 --> 00:13:53,340
from when I had the 7200 in there.

302
00:13:53,340 --> 00:13:56,974
As a matter of fact, let's
just get rid of all of that.

303
00:13:56,974 --> 00:13:59,570
So here's what I'm gonna do
to make it nice and simple.

304
00:13:59,570 --> 00:14:03,755
I'm gonna stop the router, close up shop.

305
00:14:03,755 --> 00:14:05,556
Quit, yep. Discard.

306
00:14:05,556 --> 00:14:06,958
I don't want any changes.

307
00:14:06,958 --> 00:14:09,205
Alright let's go ahead
and restart GNS3 again.

308
00:14:09,205 --> 00:14:10,952
I'm just trying to show
you how this affects

309
00:14:10,952 --> 00:14:14,105
the memory of your laptop as
I do these various things.

310
00:14:14,105 --> 00:14:17,938
Okay, let's go ahead and
title it Test2. Okay.

311
00:14:21,219 --> 00:14:23,969
Edit, Preferences, Routers. Okay.

312
00:14:25,186 --> 00:14:27,965
So for Test 2 I'm going to say
I don't want the 7200 at all.

313
00:14:27,965 --> 00:14:30,124
So let's just get rid of that image.

314
00:14:30,124 --> 00:14:31,124
Apply. Okay.

315
00:14:32,671 --> 00:14:36,481
Alright, so let's bring
a 3725 into the mix.

316
00:14:36,481 --> 00:14:40,136
Start it up, okay so we have one router.

317
00:14:40,136 --> 00:14:44,005
But this time it's a different
router, a 3725 router.

318
00:14:44,005 --> 00:14:48,013
Now when we go into Test2
project, there it is,

319
00:14:48,013 --> 00:14:51,480
and go into our project files, dynamips,

320
00:14:51,480 --> 00:14:53,846
we can see with that 3725

321
00:14:53,846 --> 00:14:57,312
that is currently running right now,

322
00:14:57,312 --> 00:14:58,758
the single largest file we have

323
00:14:58,758 --> 00:15:02,591
is our ghost file for that
particular software image.

324
00:15:02,591 --> 00:15:03,496
That's it.

325
00:15:03,496 --> 00:15:05,782
Now remember what did we
see with the 7200 series?

326
00:15:05,782 --> 00:15:08,383
When I opened up a second router,

327
00:15:08,383 --> 00:15:11,979
well with just one 7200 not
only did we have the ghost file,

328
00:15:11,979 --> 00:15:15,614
we also had this really large
iO Mem file for the 7200

329
00:15:15,614 --> 00:15:19,089
that was basically the same size.

330
00:15:19,089 --> 00:15:21,909
And every time I opened a second 7200,

331
00:15:21,909 --> 00:15:23,535
and then a third 7200,

332
00:15:23,535 --> 00:15:26,802
that created another iO Mem file for that.

333
00:15:26,802 --> 00:15:30,219
But notice, no iO Mem files for the 3725.

334
00:15:31,135 --> 00:15:34,630
Let's go ahead and open up a
second instance of that router.

335
00:15:34,630 --> 00:15:36,990
Let's go ahead and drag and drop it.

336
00:15:36,990 --> 00:15:40,268
Let's start it up, there we go.

337
00:15:40,268 --> 00:15:43,851
Go back to our file,
and notice once again,

338
00:15:46,408 --> 00:15:50,147
we only have one large
file, just the ghost file.

339
00:15:50,147 --> 00:15:52,627
We don't have those
really large iO Mem files

340
00:15:52,627 --> 00:15:56,044
that we were seeing with the 7200 series.

341
00:15:57,647 --> 00:15:59,516
So what's the takeaway from all of this?

342
00:15:59,516 --> 00:16:01,251
We've talked about a lot of stuff.

343
00:16:01,251 --> 00:16:03,773
The takeaway from this is, number one,

344
00:16:03,773 --> 00:16:05,531
when you are importing your router,

345
00:16:05,531 --> 00:16:08,250
your software images into GNS3,

346
00:16:08,250 --> 00:16:11,625
some of those software images,
like for the 7200 series,

347
00:16:11,625 --> 00:16:14,946
every time you start a new router,

348
00:16:14,946 --> 00:16:18,077
it takes up a gob of
memory in your laptop.

349
00:16:18,077 --> 00:16:19,848
We saw that with the 7200 series,

350
00:16:19,848 --> 00:16:22,188
and I just had two routers in my topology.

351
00:16:22,188 --> 00:16:25,324
Other software images like the 3725,

352
00:16:25,324 --> 00:16:27,808
you can start up three, four, five, six

353
00:16:27,808 --> 00:16:29,500
instances of those routers

354
00:16:29,500 --> 00:16:31,886
but you're only going to
have one large ghost file

355
00:16:31,886 --> 00:16:33,058
representing the software,

356
00:16:33,058 --> 00:16:35,640
you're not going to have
multiple instances of other files

357
00:16:35,640 --> 00:16:37,974
like these iO Mem files.

358
00:16:37,974 --> 00:16:41,082
So that's really going to
conserve memory in your laptop.

359
00:16:41,082 --> 00:16:42,546
And the other thing we talked about was,

360
00:16:42,546 --> 00:16:45,747
when you're importing a
software image into GNS3,

361
00:16:45,747 --> 00:16:47,542
one of the things it's
going to ask you is,

362
00:16:47,542 --> 00:16:50,025
how much memory do you want
to allocate for this router?

363
00:16:50,025 --> 00:16:53,699
As a good rule of thumb, it's
a good idea to know in advance

364
00:16:53,699 --> 00:16:56,733
how much memory that router image needs,

365
00:16:56,733 --> 00:16:58,831
based on the Cisco Feature Navigator.

366
00:16:58,831 --> 00:17:02,746
And once you have that, allocate
that same amount into GNS3

367
00:17:02,746 --> 00:17:05,717
for that particular platform.

368
00:17:05,717 --> 00:17:08,050
(whooshing)