12/23/2023 0 Comments Loopback addressExample 5-2 demonstrates the process.Įxample 5-2 Configuring a Loopback InterfaceĮnter configuration commands, one per line. You can configure a loopback interface by executing the interface loopback 0 command in the router configuration mode. ![]() ![]() Because a loopback interface is not a physical interface, like Ethernet, you must create it. The use of a loopback interface enables you to assign the RID. The default method to determine the OSPF RID for Cisco routers is loopback interface and then the highest IP address assigned to an interface. Configuring a Loopback InterfaceĪs previously discussed, the use of a loopback interface forces the selection by OSPF of its RID. It has built-in defaults that force it to accept a loopback interface first and then accept the highest IP address on any interface. TIP You cannot tell OSPF to use a particular interface as its RID. Because loopback interfaces never go down, greater stability throughout your OSPF network is achieved. If a loopback interface is configured with an IP address, OSPF defaults to using this IP address as its RID, even if other interfaces have higher IP addresses. The highest IP address on a router would be the largest numerical IP address assigned to an active interface. ![]() If the interface associated with this IP address is ever unavailable, or if the address is removed, the OSPF process must recalculate a new RID and flood all its routing information out its interfaces. OSPF uses the highest IP address configured on an active interface as its RID.
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