ssgilani

[syed_sam_gilani]

I have obtained a realtime IOS from my cisco 3750 switch via copy flash: tftp:
c3750-ipservicesk9-mz.122-35.SE5.bin

It is copied to tftp server

Now i have tried to run it on GNS3 by clicking "Preferences" and then creating new IOS image, but it gives error for "not a valid IOS image" .

any suggestion or solution??

[Mark Malone]

Hi

That's for a 3750 model not a 3550 that will not work , you need to download images specific to the platform   c3550

[Andrey Kornienko]

https://www.gns3.com/support/docs/virtual-machines-supported-2

At this moment, it is not possible to emulate Catalyst switches with Dynamips/GNS3. This is due to the impossibility to emulate ASIC processors used in those type of devices. However, you can use the EtherSwitch module with 2600s, 3600s and 3700s Series.

Keep in mind that this module works differently (uses the vlan database etc.) and doesn’t support the following features: ....

[syed_sam_gilani]

Dear Andrey

Thanks for guidance,

i have been trying to sort it out since couple of months,

the basic idea was to bring my real switch environment to virtual with GNS3, but yeah u r right, its not possible at the moment.

anyhow

bundles of thanks

[Mark Malone]

You can as well bridge a real network to gns3 easily enough using virtual adapters and MS loopbacks and connect to the internet through them as well

[Mark Malone]

If you want full switching in gns3 use an IOU Linux image not IOS , most l2 features work on them

like below

i86bi-linux-l2-adventerprisek9-15.1a.bin