Stub hosts are visible to the routing protocols but not used for forwarding. Loopback interface is treated as a stub HostĪll loopback interfaces are considered as OSPF “LOOPBACK” network type and treated as stub host. Process ID 10, Router ID 3.3.3.3, Network Type LOOPBACK, Cost: 1 The purpose of this lab is enumerate different methods that will help get rid of these limitations to make the lab topology as close as possible to the production environment.įigure1 shows an example of Lab topology in which a loopback interfaces are used: “Loopback” type is frequently used in testbeds and lab environments to imitate subnet segments, but there is some limitations related to this network type. In production environment you certainly have been dealing with “point-to-point”, “broadcast”, ”NBMA”, “point-to-multipoint” and “point-to-multipoint-non Broadcast” but less with “loopback” type.
OSPF network type classification is an example of this organization. The main advantage of OSPF over other IGP protocols is its organizational aspect, it brings routing design efforts down to the infrastructure, providing better stability and faster troubleshooting.
