To enable OSPF on an interface, you only need to add it into the prefix list. Note that using a loopback interfaces requires the configuration of appropriate firewall policies that allow traffic to it. Using loopback interface allows having an IP address that does not depend on a physical interface, hence is always up. It is also used within the Customer network for the iBGP peering. The use of loopback interfaces into this BGP/OSPF design is a simple rule that eases the OSPF troubleshooting and administration, where we will set the OSPF router ID identically to the loopback interface. Note: all requirements, addresses and network information above are only given as examples for this case study.
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