Enabling OSPF Neighbor Discovery on LANs
OSPF sends multicast OSPF Hello messages on LAN interfaces, attempting to discover OSPF neighbors, when two requirements are met:
OSPF has been enabled on the interface, either through the network router subcommand or the ip ospf area interface subcommand.
The interface has not been made passive by the passive-interface router subcommand.
When both requirements are met, OSPF sends Hellos to the 224.0.0.5 ...
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