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Cisco IOS images for Dynamips

  • GNS3 offers multiple ways to emulate IOS.
    1. 1.
      For older images, we use and maintain Dynamips;
      1. 1.
        An emulator dedicated to emulate some Cisco hardware.
      2. 2.
        Dynamips can run unmodified IOS images.
    2. 2.
      In the new GNS3 1.4, there is a way to run a second category of switches and routers.
      1. 1.
        These are classified as Routing and Switching virtual machines (or R+Svms) for short.

Differences between IOS images and R+Svms

  1. 1.
    IOS images are usually run in Dynamips however R+Svms are housed in a virtual machine.
  2. 2.
    IOS images are lower in cpu and memory so you can fit more of them in one topology.
  3. 3.
    R+Svms are all vendor Routing and Switching images that are larger in size but can be imported into GNS3 for real world network emulation.

Idle-PC value

This settings will help Dynamips to consume less CPU. It’s specific to each different IOS image.
  • We really recommend using c3640, c3660, c3725, c3745 and c7200 IOS images.
  • They have proven to be the most stable in GNS3 provided you use the right amount of RAM and Idle-PC value.
Series
File name
Proposed idle-PC value
c3640
c3660
0x606071f8
c3725
0x60c09aa0
c3745
0x602701e4
c7200

Source

http://docs.gns3.com/1-kBrTplBltp9P3P-AigoMzlDO-ISyL1h3bYpOl5Q8mQ/
http://www.ciscopress.com/articles/article.asp?p=2106547
http://sfree.ws/model?main_group_id=1&child_group_id=104&model_id=1407&release_id=29601