3Com Switch 7750 SeriesCommand Reference Guide – Routing Protocol Chapter 3 OSPF Configuration Commands3-42Example# Configure interface Vlan-interface 3 to write MTU value area when sending DDpackets.<3Com> system-viewSystem View: return to User View with Ctrl+Z.[3Com] interface Vlan-interface 3[3Com-Vlan-interface3] ospf mtu-enable3.1.36 ospf network-typeSyntaxospf network-type { broadcast | nbma | p2mp | p2p }undo ospf network-typeViewInterface viewParameterbroadcast: Changes the interface network type to broadcast.nbma: Changes the interface network type to NBMA.p2mp: Changes the interface network type to point-to-multipoint.p2p: Changes the interface network type to point-to-point.DescriptionUse the ospf network-type command to configure the network type of OSPFinterface.Use the undo ospf network-type command to restore the default network type of theOSPF interface.OSPF divides networks into four types based on link layer protocol:z Broadcast: If Ethernet or FDDI is adopted, OSPF defaults the network type tobroadcast.z Non-Broadcast Multi-access (nbma): If Frame Relay, ATM, HDLC or X.25 isadopted, OSPF defaults the network type to NBMA.z Point-to-Multipoint (p2mp): OSPF will not default the network type of any linklayer protocol to p2mp. The general undertaking is to change a partiallyconnected NBMA network to p2mp network if the NBMA network is notfully-meshed.z Point-to-point (p2p): If PPP, LAPB or POS is adopted, OSPF defaults thenetwork type to p2p.
