Switch virtual interface SVI configuration on gns3

A switch virtual interface (SVI) is a VLAN of switch ports represented by one interface to a routing or bridging system. There is no physical interface for the VLAN and the SVI provides the Layer 3 processing for packets from all switch ports associated with the VLAN.

How Switch virtual interface SVI  works:

This is much simpler than inter VLAN, but disadvantage is high cost of a layer-3 switch.

In SVI configuration we need a layer-3 switch, I use a 3640 router IOS and use the NM-16ESW module for layer-3 switching. The topology I used for switch virtual interface (SVI) is consist of one switch and two hosts one of them is in VLAN 10 and other is in VLAN 20. I have create two switch virtual interface s(SVI) on switch for VLAN 10 and 20, which are responsible for communicating these two VLANs.

 

Configuration for Switch:

SW#vlan database

SW(vlan)#vlan 10 name office1

SW(vlan)#vlan 20 name office2

SW(vlan)#exit

SW(config-if)#interface vlan 10

SW(config-if)#ip address 10.1.1.1 255.255.255.0

SW(config-if)#no shu

SW(config-if)#interface vlan 20

SW(config-if)#ip address 20.1.1.1 255.255.255.0

SW(config-if)#exit

SW(config)#ip routing

SW(config-if)#interface f0/0

SW(config-if)#no shutdown

SW(config-if)# switchport mode access

SW(config-if)# switchport access vlan 10

SW(config-if)#interface f0/1

SW(config-if)#no shutdown

SW(config-if)#switchport mode access

SW(config-if)# switchport access vlan 20

Configuration for Qemu1

tc@box:$ sudo su 
root@box:$ Ifconfig eth0 10.1.1.2 netmask 255.255.255.0

root@box:$ Route add default gw 10.1.1.1 eth0

Configuration for Qemu2

tc@box:$ sudo su 
root@box:$ Ifconfig eth0 20.1.1.2 netmask 255.255.255.0

root@box:$ Route add default gw 20.1.1.1 eth0

Results:

Ping from qemu1 to qemu2 is successful and voice versa.