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Install Dynamips & Dynagen: Create a new directory for dynamips sudo mkdir /opt/dynamips Change to dynamips directory cd /opt/dynamips Change the folder permissions sudo chmod -R 755 /opt/dynamips Download latest dynagen software Extract the tarball by right clicking the file and extract to. By Stamati Panagiotaras (Panos) CCIE 17823 I’ve been using dynamips for Linux for the past 7 years now and i thought i would share with you my installation to help you set this up yourself. The advantages of this installation is cost. Firstly i do not have 9 extra routers consuming electricity but also the cost of buying all the separate routers will not be cheap!! Also installing this on linux really does make dynamips/dynagen run much faster and more reliably compared to Windows. Full Installation including cabling and how to console Here i’m going to try and show you how i setup an CCIE R&S Lab using Quad NIC’s to real switches on Ubuntu Precise 12.04 LTS. I have 1 Cisco 3750, 1 Cisco 3560 & 2 Cisco 3550’s I bought my serial to USB cables (used to console from my Ubuntu box to the ‘real switches’) from this company.
I decided they were the best choice after using so many others in the past and having been faulty or fake. I custom made my server, which i bought in parts from ebay. You just need to make sure you have enough PCI ports (if you’re using Quad PCI NIC’s.) when looking for a motherboard and it should be able to run at least dual core with 4gb memory.
This will be our 9 virtual Routers for the Internetwork Expert Labs. I bought 3 Quad PCI NIC’s.
– D-Link DFE-580TX – 4 Console Cables (These are connected to the USB to Serial Cables i bought from Tronisoft) I bought 20 0.5m Cat 5 Patch Cables (Switch to Switch) and 11 1M Cat 5 Patch Cables (Switch to D-Link DFE-580TX) – They were 90p a cable. Here’s how i set mine up. Cabling the Switches to Your PC/Server Add the Quad NIC’s to your first 3 PCI slots on your Motherboard. Cable your switches as shown in the topology below. When connecting from your Quad NICs to your Switches take note of how the ine.net file is configured so you can see how the ports are binded.
I’ll explain:- For example in the ine.net file (full configuration is further down the page) R1’s ine.net connfiguration says:- F0/0 = NIOlinuxeth:eth1 That means the 1st Quad NIC port is connected to R1’s F0/0 F0/0 = NIOlinuxeth:eth2 That means the 2nd Quad NIC port is connected to R2’s FO/O F0/0 = NIOlinuxeth:eth3 F0/1 = NIOlinuxeth:eth4 So on R3’s f0/0 is connected to the 3rd NIC and F0/1 is connected to the 4th etc. Dynamips Installation Install Dynamips & Dynagen: Create a new directory for dynamips sudo mkdir /opt/dynamips Change to dynamips directory cd /opt/dynamips Change the folder permissions sudo chmod -R 755 /opt/dynamips Download latest dynagen software from the link above Extract the tarball by right clicking the file and extract to. Setting Up Idle-PC I f you don’t configure the idle-pc, your computers’ CPU will be 100% utilised. ‘This is because Dynamips does not know when the virtual router is idle and when it is performing useful work. The “idlepc” command performs analysis on a running image to determine the most likely points in the code that represent an idle loop in IOS.
Once applied, Dynamips “sleeps” the virtual router occasionally when this idle loop is executed significantly reducing CPU consumption on the host without reducing the virtual router’s capacity to perform real work. ‘ This will help you judge which is the correct idlepc value. Open a new terminal and type top Double click the desktop executable we called ‘INE Startup’. In the Dynagen window type start R1 Now telnet to R1 telnet R1 Wait for the Router to fully load; Until all interfaces are up. For example Now, switch back to the Dynagen management console, and issue an “idlepc get R1 ”.
You will see a message that statistics are being gathered, and about 10 seconds later you should see a list of potential idlepc values: Values that will most likely provide better results are marked with an asterisk. Select one of the values to try from the menu and press Enter. You should notice from your terminal window displaying the top CPU proceeses, the CPU utilization drops dramatically. If so, you’ve found a good idlepc value for this particular IOS image. ‘The new idlepc value will take effect dynamically.
Once you’ve found a value that works, you can save it to your local idlepc database with “idlepc save R1 db”. If your CPU usage did not drop, it’s time to try a different value. Type “idlepc show routername ” to show the list of values determined earlier again, and this time select a different one.
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Go to your dynagen window and type stop R1 This stores the idlepc value for this IOS image in the file specified in dynagen.ini with the “idledb” option. The default is a file name “dynagenidledb.ini” in your $HOME or folder. Idle-PC values are particular to an IOS image. They will be different for different IOS versions, and even for different feature sets of the same IOS version. However Idle-PC values are not particular to your host PC, operating system, or to the version of dynamips. So “dynagenidledb.ini” files from one system can be freely copied, merged, shared with others, etc. It is possible that dynamips will not be able to find an idlepc value for an image, or that the values it does find do not work.
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If this happens, try repeating the process again. Or you just might be out of luck with that particular image (however running into this situation is rare.)’ To shutdown dynamips you have to simply close the window. It seems that when ever I try and kill the process, dynamips restarts in a perpetual loop. This means that dynamips will be still running in the background but it shouldn’t affect anything else too drastically.
I do advise a reboot. Installing a multi tab console I suggest using Gnome Connection Manager. Although this is a matter of personal preference It’s very simple to use. Go to Download and run the deb file This will load the deb file into the software repositary and start up ‘Ubuntu Sofware Centre.
Install and then run. Add all the Router and Switch configurations into GCM. Press Add Correct the fields so they look like this This should be done for all Routers and switches. When adding the next device remember to change the Port numbers in this box so that they correspond with our pre-configured ports. For example R1 Port 2001 R2 Port 2002 R3 Port 2003 R4 Port 2004 R5 Port 2005 R6 Port 2006 BB1 Port 2011 BB2 Port 2012 BB3 Port 2013 SW1 Port 3001 SW2 Port 3002 SW3 Port 3003 SW4 Port 3004 And That’s it!!!
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My PC's configurations are as follows: Pentium Dual-Core CPU E5200 2.50GHz RAM 2GB 32Bit Windows 7 Ultimate - I have installed gns3 (GNS3-0.6.1-win32-all-in-one) on it successfully. Now the problem is that when i try test the dynamips, it giving an error ' Failed to start dynamips '. I have googled & try to search prossible solution to this problem but none of them have worked for me. Changes done with gns3 on Windows 7 1) Ran the shortcut icon of gns3 on desktop in Run as Administrator 2)Added GNS3 & winxp.exe & dynamips-wxpprogramme in firewall exception 3)Give full permission to dynamips folder in gns3 - C: Program Files GNS3 Dynamipsdynamips-wxp.exe -H 7200 Cisco Router Simulation Platform (version 0.2.8-RC2-x86) Copyright (c) 2005-2007 Christophe Fillot. Build date: Oct 14 2007 10:54:51 ILT: loaded table 'mips64j' from cache. ILT: loaded table 'mips64e' from cache. ILT: loaded table 'ppc32j' from cache.
ILT: loaded table 'ppc32e' from cache. Hypervisor TCP control server started (port 7200). Ok, I've just installed GNS 0.7.2 on a XP 32-bit system. After installing I enter the 2 steps setup that appears when opening GNS3 for the first time after installation. Configure and test path to Dynamips.
Also check that the working directory is valid. Add one or more uncompressed IOS images. Enter first step, went to Dynamips tab and just press Test, without any other modification. You don't have to create a new folder, named Dynamips. You just need to make sure the path to the folder where dynamips is installed (folder where dynamips-wxp.exe is located) is the right one.