![]() 127.0.0.1 is the address most commonly used for testing purposes. will borrow the loopback 5 IP address to use it on the GigabitEthernet0/0 interface as a next hop for the neighbor. interface GigabitEthernet0/0 ip unnumbered loopback 5. Is there anything wrong with my configurations. On a point-to-point link, you dont always need an IP address on the routers interface but you must inform the router of this fact, using the ip unnumbered command. ![]() Since the lower layers are short-circuited, sending to a loopback address allows the higher layers (IP and above) to be effectively tested without the chance of problems at the lower layers manifesting themselves. During the configuration I noticed that the created loopback interface is not pingable and the vxlan interface is down due to loopback interface is inactive. The purpose of the loopback range is testing of the TCP/IP protocol implementation on a host. In essence, this represents a “short-circuiting” of the normal protocol stack data is sent by a device's layer three IP implementation and then immediately received by it. Instead, they “loop back” to the source device at the IP level. IP datagrams sent by a host to a 127.x.x.x loopback address are not passed down to the data link layer for transmission. However, one special range of addresses is set aside for loopback functionality. That datagram then passes down to the data link layer of the device's physical network for transmission to the next hop, on the way to the IP destination. Normally, when a TCP/IP application wants to send information, that information travels down the protocol layers to IP where it is encapsulated in an IP datagram.
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