OSPF advertising loopback network

OSPF will always advertise the networks on loopback interfaces as /32 networks, even if you have configured them with a different subnet. This is how OSPF operates, and it is even defined within the RFC. If you want to change this behavior, you can use the ip ospf network point-to-point command under the loopback interface configuration mode. This will cause OSPF to advertise the configured subnet mask of the loopback interface.




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