Layer 3 Switch in GNS3

GNS3 is a cisco simulator to perform network analysis without cost. GNS3 has very good features like Router, Switch, ATM switch, Frame Relay Switch, host(vpcs) etc, but it also has a limitation in switching, all the concepts of switching can not be perform on GNS3. This due to compatibility of GNS3 with switch chip.

In GNS3 there is a layer 3 switch icon in images, but we can not use it without having c3725 IOS image. 3725 IOS image is the image used in two way.

1. 3725 router

2. Layer 3 switch.

So to emulate Layer 3 switch in GNS3, we have to follow some steps :-

1. Install GNS3

                   Simple Steps for Installation of GNS3.

2. Try to get the c3725-spservicesk9-mz.124-21 from your sources. 
                   Download c3725-spservicesk9-mz.124-21 IOS Image.
 
3. Add 3725 IOS Image to GNS3.
                   Add IOS Image to GNS3. 

4. Now, on symbols bar, drop the EtherSwitch Router and fire it up.

By :- Vishal Sharma