Operation Manual – Routing ProtocolH3C S7500 Series Ethernet Switches Chapter 4 OSPF Configuration4-13Note:z You must use the stub command on all the routers connected to a stub area toconfigure the area with the stub attribute.z You must use the nssa command on all the routers connected to an NSSA area toconfigure the area with the NSSA attribute.4.5 OSPF Network Type ConfigurationOSPF divides networks into four types by link layer protocol. See section 4.1.4"OSPF Network Types". An NBMA network must be fully connected. That is, any tworouters in the network must be directly reachable to each other through a virtual circuit.However, in many cases, this cannot be implemented and you need to use acommand to change the network type forcibly.Configure the interface type as P2MP if not all the routers are directly accessible onan NBMA network. Change the interface type to P2P if the router has only one peer onthe NBMA network.In addition, when configuring a broadcast network or NBMA network, you can alsospecify DR priority for each interface to control the DR/BDR selection in the network.Thus, the router with higher performance and reliability can be selected as a DR orBDR.4.5.1 Configuration PrerequisitesBefore configuring the network type of an OSPF interface, perform the followingtasks:z Configuring the network layer address of the interface so that adjacent nodes arereachable at network layerz Performing basic OSPF configuration4.5.2 Configuring the Network Type of an OSPF InterfaceFollow these steps to configure the network type of an OSPF interface:To do... Use the command... RemarksEnter system view system-view —Enter interface view interface interface-typeinterface-number —
