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Loopback
Lookback interface is a widely known virtual interface on routers which is highly robust and always up,
not like physical interfaces which disconnect every now and then. The lookback interface can have its
own IP and subnet mask. It is often used for router management as Telnet management IP and
involved in BGP as BGP Update-Source, involved in OSPF as Router ID.
IP Address: To specify the IP for the lookback interface.
IP Subnet Mask: To specify the subnet mask for the lookback interface.
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