Each loopback required a unique IPv4 address. We can enable multiple loopbacks on the Cisco router. The configuration of the Loopback interface We can also apply stateless firewall filters to the loopback address to filter packets originating from, or destined for, the Routing Engine. Additionally, ping and mpls also need a loopback address to function correctly. ![]() The OSPF also uses the loopback address to determine protocol-specific properties for the device or network. Loopback interfaces are also used as the termination points for Remote Source-Route Bridging and Data-Link Switching Plus. Loopback Interface is always up and allows Border Gateway Protocol ( BGP) neighbours between two routers to stay up even if one of the outbound physical interfaces connected between the routers is down. We can use the loopback to recognize the device because the address of the loopback never changes, therefore it is the preferred method for identification of the router. We can use the loopback interface for routing purposes instead of a physical interface address. For example, we can use a loopback for testing purposes. It is very useful in troubleshooting and managing a Cisco router because it ensures that at least one interface should always be available for management. Its state is always up when a router is functioning. Therefore it is cannot connect to any other device physically. So let’s come to the topic as I said that the loopback interface is a logical interface and it is not physically found in the router. ![]() ![]() The address of the lesson is Cisco Router Interface Configuration I have already discussed the IPv4 interface configuration in one of my previous lessons. In this lesson, we should discuss this interface configuration but at this stage, it is necessary to know the Pv4 interface configuration before the IPv4 loopback interface configuration. The IPv4 loopback interface is a logical interface configure internally in the router.
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