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Created on: Feb 25, 2012 1:42 PM by Helder Neves - Last
Modified: Nov 7, 2013 3:51 AM by Joydeep Deb
How to emulate a switch on gns3VERSION 2
Hi guys, after some research with a friend, we can successfully
simulate a switch. 1 - Install gns3 ( );2 - try to get the
c3725-adventerprisek9-mz.124-15.T14 from your sources;3 - open the
gns3 and go to edit > symbol manager. Add the ethernet_switch,
double click on it on right bar, and select router c3700 on
type,apply, OK.4 - go to edit > ios images and hypervisors, add
the right image and save. Now, on symbols bar, drop the
ethernet_switch and fire it up!! Hope it helps! Regards.
40350 Views Categories: CCENT/CCNA v1.1 ContentTags: how, to,
emulate, a, switch, on, gns3, icnd1, lab, labs, materials, network,
new_to_cisco, newbie, passed, rip, route, router, routing, exam,
study,hardware, duplex, simulators, sdm, cisco, ccna,
routing_and_switching, ccent, address
Feb 25, 2012 3:31 [email protected] says:
Hi Helder, I went and got the image and instelled gns3 follwoing
your instructions but cannot my virtual router started. The guide
from GNS3 stipulateshow to do a simple start but sofar no success
in getting a putty console started. I will try again tomorrow with
a clear head. Thanks for the tip!!!!
Feb 25, 2012 3:47 PMBrianM says: (in response to
[email protected])
Hey borco1954, I've been using gns3 for a while now and I love
it. It's a lot cheaper than the lab gear I have. This should help
you out.1) drag your router into the topology2) right click on it
and choose "configure"3) go over to the "slots" tab4) leave the
"slot 0" the way it is5) make a "slot 1" entry for "NM-16ESW",
apply and save your changes6) change the symbol on it to look like
a switch if you want7) enter the "no ip route" command in global
config mode so it doesn't act like a router Note 1: I've never been
able to simulate port-security with them Note 2: the vtp stuff
takes a little getting used to Switch# show vlan-switch Switch#
vlan database (to do your vtp and vlan stuff) Enjoy!
Feb 25, 2012 9:44 PMJoshua Johnson - CCNP R&S says: (in
response to BrianM)
you should use packet tracer, the 16esw module is very
limited...
Feb 26, 2012 9:07 [email protected] says: (in response to
BrianM)
Hi Brain and Helver, Thanks for the information. I sitched from
Windows 7 and moved to a Window XP platform and got - sofar those
things running that didn'twork last night. This is really great
stuff from a learning perspective. The feature I like is the
Virtual Box Guest. Don't know exactly if it worksbut it suggests
being able to run a VB virtual machine running on my XP machine.
will test it at an opportune time. I just wanted to express
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How to emulate a switch on gns3 - The Cisco Learning Network
https://learningnetwork.cisco.com/docs/DOC-13824
1 of 3 6/23/2014 4:18 PM
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Feb 27, 2012 10:03 PMJoshua Johnson - CCNP R&S says: (in
response to Helder Neves)
Trust me, you will soon learn to hate that module my good
chum.
Helder Neves wrote:
Hi good people. It wont emulate a FULL-BASED switch, but his
imae have th mos switch commands...
Apr 11, 2012 5:38 AMCischology says: (in response to BrianM)
Hi, "no ip route" this is not complete! right ? do i need to do
it for all networks "ip route 0.0.0.0 0.0.0.0" thank you in
advance
Nov 7, 2013 12:30 PM"RedNectar" Chris Welsh says:
The easiest way to emulate an IOS switch in GNS3 (0.8.4 or
later) is simply to:
TIPS
The following is an extract from the book GNS3 Network
Simulation Guide, which gives some more information on the NM-16ESW
moduleused in the EtherSwitch router device. [Disclaimer: I am the
author of this book]
The NM-16ESW is based on older Cisco hardware and does not
support many of the new switch features that CCIE andCCNP
candidates are expected to learn about.However, to overcome some of
the shortcomings, there is a baseconfig_sw.txt file that is used as
the startup configuration filefor the 37xx EtherSwitch router. You
can find this file in your Images directory and customize if you
wish. By default it makesthe following changes:Firstly, routing is
disabled. This means that if you wish to use it as a layer 3
switch, you will have to add the command iprouting, just like you
would with say a 3750 switch. Switch ports begin at FastEthernet
1/0, so FastEthernet 0/0 and 0/1 areshutdown and should be left
shutdown if you want the device to function as a switch. Also,
since these switch ports are not ableto detect duplex, they have
all been preconfigured with speed 100 and duplex full. One of the
most difficult features to get usedto if you are familiar with
Catalyst switches are the commands that substitute vlan-switch for
the familiar and simple vlan incommands like:show vlan-switch
briefThe other annoying fact (if you have an older version of IOS)
is that the switch still uses the vlan database style
commands,although there are some macros that will get loaded and
help you out if your IOS is new enough, such as an exec macro vl
thatwill expand to show vlan-switch brief.
As others have said, it won't do all the things that a modern
hardware switch will do, but it will do enough to let you learn the
concepts (ifnot the most modern forms of the commands) of: (from
http://www.cisco.com/web/learning/exams/list/icnd1b.html#~Topics)
Make sure you have a default c37xx router image in your list of
IOS images1.Click on the "Browse Switches" icon in hte left hand
pane2.Drag an "EtherSwitch router" device onto your topology 3.
Be careful when connecting devices to your switch device - make
sure you connect to ports numbered 1/x - DON'T use interface 0/0
or0/1Don't use the "auto connect" feature (by holding when you
select the "add-a-link" tool and selecting a connection type)
If you do use the "auto connect" feature then interfaces 0/0 and
0/1 will be selected on the EtherSwitch Router device
Identify basic switching concepts and the operation of Cisco
switches.Collision DomainsBroadcast DomainsTypes of switchingCAM
Table
Describe how VLANs create logically separate networks and the
need for routing between them.Explain network segmentation and
basic traffic management concepts
Configure and verify VLANs
How to emulate a switch on gns3 - The Cisco Learning Network
https://learningnetwork.cisco.com/docs/DOC-13824
3 of 3 6/23/2014 4:18 PM
