create_cisco_topology.md

Create Cisco Topology

To configure a Cisco topology, you must first add IOS images to GNS3. Watch this video to understand how to add images and setup Cisco topology.

Example 1: GNS3 topology consisting of two Cisco routers

The official document explains to configure a simple GNS3 topology consisting of two Cisco routers.

Example 2: Set-up Cisco router configuration to receive/forward data packets between computer networks

Final topology snapshot:

Open console for respective node and copy following commands.

PC1 configuration:

ip 192.168.10.1 255.255.255.0 192.168.10.2

PC2 configuration:

ip 192.168.20.1 255.255.255.0 192.168.20.2

Router(R1) configuration:

ip address of interface fa0/0 will be same as default Gateway(192.168.10.2) of PC1.

Router>enable
Router#conf t
Router(config)#int fa0/0
Router(config-if)#ip address 192.168.10.2 255.255.255.0
Router(config-if)#no shut
Router(config-if)#exit
Router(config)#int serial0/0
Router(config-if)#clock rate 128000
Router(config-if)#ip address 192.168.30.1 255.255.255.0
Router(config-if)#no shut
Router(config-if)#exit
Router(config)#ip route 0.0.0.0 0.0.0.0 192.168.30.3
Router(config)#exit
Router#wr

Router(R2) configuration:

ip address of interface fa0/0 will be same as default Gateway(192.168.20.2) of PC2.

Router>enable
Router#conf t
Router(config)#int fa0/0
Router(config-if)#ip address 192.168.20.2 255.255.255.0
Router(config-if)#no shut
Router(config-if)#exit
Router(config)#int serial0/0
Router(config-if)#clock rate 128000
Router(config-if)#ip address 192.168.30.2 255.255.255.0
Router(config-if)#no shut
Router(config-if)#exit
Router(config)#ip route 0.0.0.0 0.0.0.0 192.168.30.3
Router(config)#exit
Router#wr

Test the topology :

• From PC1 ping 192.168.20.1(PC2)
• From PC2 ping 192.168.10.1(PC1)

Both should be able to ping sucessfully

References:

• https://www.youtube.com/watch?v=52tbNuHX2G8