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What is Loopback interface in Cisco Router and what is use of loopback interface how to configure Loopback interface
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Basic Settings on a Router (1.1.3) > Cisco Networking Academy's Introduction to Routing Concepts | Cisco Press
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Fred de Jonge | Cisco Router - Site to site configuration on a router with 2 BGP interfaces and 1 Loopback interface with External IP.
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