a virtual interface that allows Border Gateway Protocol (BGP) and remote source-route bridging (RSRB) sessions to stay up even if the outbound interface is down
a virtual interface that is always up and allows BGP and RSRB sessions to stay up even if the outbound interface is down
a virtual interface that is always up and allows routing protocols to stay up even if the physical interface is down
An interface that bypasses unnecessary communications functions when the information is addressed to an entity within the same system.
A software function that emulates many of the functions of a real interface.The loopback interface has no hardware associated with it, and it is not physically connected to a network. Internet Control Message Protocol (ICMP) Network layer Internet protocol that reports errors and provides other information relevant to IP packet processing.