OSPF Configuration 239Entering OSPF Area ViewPerform the following configurations in OSPF View.area_id is the ID of the OSPF area, which can be a decimal integer or in IP addressformat.Specifying the InterfaceOSPF divides the AS into different areas. You must configure each OSPF interface tobelong to a particular area, identified by an area ID. The areas transfer routinginformation between them through the ABRs.In addition, parameters of all the routers in the same area should be identical.Therefore, when configuring the routers in the same area, please note that mostconfigurations should be based on the area. An incorrect configuration can disablethe neighboring routers from transmitting information, and lead to congestion orself-loop of the routing information.Perform the following configuration in OSPF Area View.You must specify the segment to which the OSPF will be applied after enabling OSPF.ip-mask can be IP address mask or IP address wildcard shielded text (similar to thecomplement of the IP address mask).Configuring a Router IDA Router ID is a 32-bit unsigned integer that uniquely identifies a router within an AS.A Router ID can be configured manually. If a Router ID is not configured, the systemselects the IP address of an interface automatically. When you set a Router IDmanually, you must guarantee that the IDs of any two routers in the AS are unique. Itis usual to set the router ID to be the IP address of an interface on the router.Perform the following configurations in System View.To ensure the stability of OSPF, you must determine the division of router IDs andmanually configure them when implementing network planning.Table 222 Entering OSPF Area ViewOperation CommandEnter an OSPF Area View area area_idDelete a designated OSPF area undo area area_idTable 223 Specifying interfaceOperation CommandSpecify an interface to run OSPF network ip_address ip_maskDisable OSPF on the interface undo network ip_address ip_maskTable 224 Configuring a router IDOperation CommandConfigure a Router ID router id router_idRemove the router ID undo router id
