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The c3660 has 2 FastEthernet fixed ports (Leopard-2FE) and supports up to 6 Network Modules (maximum of 24 Ethernet ports, 32 FastEthernet ports or 24 serial ports). The c3640 supports up to 4 Network Modules (maximum of 16 Ethernet ports, 32 FastEthernet ports or 16 serial ports). Proposed idle-PC value: 0圆03a8bac C3640 Note that tt shouldn’t be used since the latest available IOS image is very old. The c3620 supports up to 2 Network Modules (maximum of 8 Ethernet ports, 32 FastEthernet ports or 8 serial ports). Proposed idle-PC value: 0x80519c48 IOS version 12.4.15T14 (Technology train) įile name: IOS version 12.4.25d (Mainline) įile name:

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Proposed idle-PC value: 0x824a4dc4 C2600 Series Ģ600s have one or two Ethernet or FastEthernet interfaces on its motherboard, 3 subslots for WICs (maximum of 6 serial ports) and 1 Network Module slot (maximum of 4 Ethernet ports or 16 FastEthernet ports). IOS version 12.4.15T14 (Technology train)įile name: “f0”) IOS version 12.4.25d (Mainline) įile name: Note that interfaces do not use a slot designation (e.g. They’re only required for use by the Dynamips emulator) C1700 Series ġ700s have 1 FastEthernet fixed port (C1700-MB-1ETH) on its motherboard, 2 subslots for WICs (maximum of 2 Ethernet ports or 4 serial ports), and no Network Module slots. (Idle-PC values are not required with virtual machines or docker containers. To help automate the process of determining a valid Idle-PC value, you can use the Idle-PC finder button when importing a supported IOS image into GNS3: This value will vary between devices/images.

To remedy this, you can supply Dynamips with an Idle-PC value, to consume less CPU. When Dynamips runs an IOS image, a single instance can consume 100% of the processing time for a CPU core or thread. We really recommend using the c3640, c3660, c3725, c3745 and c7200 IOS images listed below, they have proven to be the most stable in GNS3 provided you use the right amount of RAM and Idle-PC value. From experience you can usually use a bit less RAM just fine. The minimum RAM is the amount of memory needed for IOS to work at maximum capacity with most feature configured and activated. We recommend Mainline over Technology train if you are interested on stability without the need of new features.Please see Cisco IOS Versions and Naming for more information. You will find the technology train images to contain the newest features but it may also contain the most bugs. Should I use a mainline and technology train image? Please note that the IOSv appliance is based on IOS 15 and there are IOU (IOS on UNIX) images with IOS 15. All other platforms are now end-of-life and only support IOS 12.4. Only the c7200 series get newer IOS 15 images.

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Currently, the c7200 images are the only ones still available for download for those with a support contract.

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.ĭue to these platforms hitting End of Sale, End of Life, and End of Support status, the images are no longer available for download from Cisco’s support sections.

IOS images are lower in cpu and memory so you can fit more of them in one topology.

IOS images are usually run in Dynamips however R+Svms are housed in a virtual machine.

What are the differences? Here are the major differences: These are classified as Routing and Switching virtual machines (or R+Svms) for short. In the new GNS3 1.4, there is a way to run a second category of switches and routers. For older images, we use and maintain Dynamips an emulator dedicated to emulate some Cisco hardware. GNS3 offers multiple ways to emulate IOS.

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