27.3.1 OSPFv3 Interface types
OSPFv3 classifies the interfaces that connect routers into the following three types, in terms of how packets are sent and received:
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Broadcast
A broadcast type network in which multiple neighboring routers are managed in an integrated manner and addressed by multicast packets
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Non-broadcast (NBMA), which is not supported
A broadcast type network in which multiple neighboring routers are managed in an integrated manner, but which has no broadcast or multicast capability
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Point-point
An interface that directly connects to a single neighboring router. It operates as a point-to-point interface on a virtual link.
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(1) Notes on configuring interfaces that use OSPFv3
OSPFv3 sometimes transmits packets that are equal in length to the Maximum Transfer Unit (MTU) value assigned to the interface. If the packet is longer than the Maximum Receive Unit (MRU, typically equal to the MTU) set on the interface that receives it, a situation might arise in which routers are unable to communicate with each other.This would not occur for normal traffic. For this reason, we recommend that you make sure the MTU of every network and every router that connects them is set to a value equal to or less than the MRU of all other interfaces when using OSPFv3.