![What is Loopback interface in Cisco Router and what is use of loopback interface how to configure Loopback interface What is Loopback interface in Cisco Router and what is use of loopback interface how to configure Loopback interface](https://1.bp.blogspot.com/-qM2HiAxY3v4/X9It9Jdz51I/AAAAAAAABwo/AuEgUHblwjAAzIpsGsHNElGst-lA1yElQCLcBGAsYHQ/s384/a5.jpg)
What is Loopback interface in Cisco Router and what is use of loopback interface how to configure Loopback interface
David Bombal on Twitter: "Paul tries to configure a loopback interface on a Cisco router with a loopback address. The router however displays the following error. Why is this configuration invalid? #CCNA #
![Basic Settings on a Router (1.1.3) > Cisco Networking Academy's Introduction to Routing Concepts | Cisco Press Basic Settings on a Router (1.1.3) > Cisco Networking Academy's Introduction to Routing Concepts | Cisco Press](https://www.ciscopress.com/content/images/chap1_9781587133237/elementLinks/01fig16_alt.jpg)
Basic Settings on a Router (1.1.3) > Cisco Networking Academy's Introduction to Routing Concepts | Cisco Press
![How to configure loopback interfaces on cisco router | Learn Linux CCNA CEH IPv6 Cyber-Security Online How to configure loopback interfaces on cisco router | Learn Linux CCNA CEH IPv6 Cyber-Security Online](https://linuxtiwary.files.wordpress.com/2016/10/loopback-interfaces-tutorial.png)