cisco 7200 simulation, dynamips,Dynagen,GNS3,PEMU,

Become a CCIE with Simulator

Become a CCIE with SimulatorSeveral months ago I wrote ‘How to Become a CCIE’,a step-by-step for wanna-be-CCIE out there based on my own experiencepassing two lab exams. In point no. 3 I mentioned that it’s compulsoryto have a home lab to be able to practice anytime.

How if we can save some money by not buying the equipment but using simulator instead? Thanks to [email=//cf@utc.fr/]Christophe Fillot[/email], the author of Dynamips – Cisco 7200 Simulator, now it’s possible to have a full CCIE lab in our PC.

Theidea of this simulator is to emulate Cisco 7200 environment with MIPSprocessor in normal PC, so we can boot the genuine IOS for Cisco 7200with 12.2 and 12.4 version. It can simulate various type of networkmodules such as PA-4T or PA-TE-FX to provide enough serial and ethernetinterfaces. The simulator offers virtual ATM, FR and ethernet switchtoo. If we can simulate 8-9 routers, with ATM, FR and ethernet switch,and put proper interconnection between those routers..voila! we have acomplete CCIE lab!

Actually this simulator has been around forquite some time. But when the first time I used this simulator, I facedso many minor issues that almost made me stop thinking about the ideato simulate CCIE lab. Before I found Dynagen,the front end interface for Dynamips, I had to map the port manuallybetween interface in one router to another interface in another routerto provide interconnectivity between them. That’s because eachinterface in this virtual router consumes 1 UDP port. So if we want toconnect one router to another router with serial connection, we need tomap udp port that represents the serial interface in the first router,to the udp port that represents the serial interface in the secondrouter.

The beauty of this is: we can connect virtual routers inone PC to another virtual routers in diferent PC through normal TCP/IPconnection.
But if you have to do the mapping manually for let’s say 8-9 routers..hmm, it’s better to do something else with our life.

SoI like to share the step-by-step how to setup CCIE lab in the PCquickly, so you can join me and all my friends who already startedpursuing CCIE in this new and cheap way

1. You need a good PC for this simulator.
I bought a new PC for this purpose. It’s a Shuttle XPC SD36G5 with Intel Dual Core 3.2 GHz and 2 GB DDR memory. Small but powerful.

WithWindows OS I can simulate up to 11 routers. With Linux OS in the samemachine I can simulate more than 15 routers. I read it somewhere thatit’s because the limitation in Windows for one process, such as thisDynamips, can take only up to 2 GB memory. While in Linux the limit forone process is 3 GB. So if one virtual router uses 128 MB, multiplethis number by number of routers plus additional memory usage by theprocess, it makes sense to have the process crashed when the number ofrouters reaches more than 10.

But fear not, there are so manyways to resolve this problem. Use Linux is one solution. Or just runDynamips in two different processes.
Surely you don’t have to compete with my PC. Any decent PC with lots of memory should be enough.

2. You need Cisco IOS for 7200 routers.
Don’t ask me, please. I am not allowed to distribute any IOS image.
Just get it from your close friend who works in Cisco partner and can download this IOS for you.
Since IOS comes as compressed binary, we need to unzip it first and keep the .bin extension:
$unzip -p c7200-js-mz.122-25.S9.bin > image.bin

I use the enterprise feature with 12.2.29S version.

3. Download Dynagen and Dynamips.
If you want to use Windows, Dynagen in SourceForge has already provided a package with Dynamips included and all the scripts to make our life easier.

4. Find the idle-pc value to avoid 100% CPU utilization.
Without idle-pc feature, even 1 single virtual router can shoot our PC CPU to 100%. To find the idle-pc value is simple:
- run one router with Dynamips (not Dynagen)
usethe same IOS, NPE and memory that you want to use for your lab. Forexample, I choose NPE-400 and 96 MB ram for each virtual router:
$./dynamips -t npe-400 -r 96 image.bin

- wait until the router completes the booting process and give you the prompt
- go the enable mode and save the configuration with write memory
- press

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Download Free Cisco Dynagen Simulation Certification Braindumps

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6. Free Cisco 7200 simulator scripts – user guide
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