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Loopback Interface in GNS3 | How to create a Loopback Interface



Loopback interfaces can be created in GNS3. In this tutorial, we will learn what is a loopback interface how we can create it.


Loopback Interface is a virtual interface which can be created on the routers. Since it is virtual, it is not dependent on any physical interface and hence is always up.



How to create:


Lets create 3 loopbacks on the same router- Loopback 1, Loopback 2 and Loopback 3 with IP Address–, and respectively.



Router(config)#int loopback 1


Router(config-if)#ip address


Router(config)# int loopback 2


Router(config)# ip address


Router(config)# int loopback 3


Router(config)# ip address



Please note that each loopback interface must belong to different Network/ Subnet.



We need not to give “No Shutdown” command after giving IP Address to the Loopback interfaces; like we do when we give IP Address to a real interface.



This is because Loopback interfaces are virtual interfaces and they are always up.



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