Configuring Routing 499OSPFThe Open Shortest Path First (OSPF) routing protocol is an Interior Gateway Protocol (IGP). EveryOSPF router builds a shortest path tree of all the routers and networks in the domain. Routinginformation is propagated in Link State Update packets both periodically and in the event of networktopology changes. This information is received, assimilated and stored in the OSPF databases ofindividual routers. An integral piece of information in the database exchange is the number and IPAddresses of the interfaces that are associated with the router. OSPF treats secondary IP Addresses asstub networks attached to the router. Hence though these networks are advertised in the OSPF routingdomain, neighbor adjacencies are never established on secondary addresses. It is also important to notehere that all secondary IP Addresses must be in the same area as the primary IP Address so that they getadvertised by OSPF. This is always true in the case of the PowerConnect 8024/8024F softwareimplementation because the area configuration is on a per interface basis as against a per network basis.The OSPF menu page contains links to web pages that configure and display OSPF parameters and data.To display this page, click Routing →OSPF in the tree view. Following are the web pages accessible fromthis menu page:• OSPF Configuration• Area Configuration• Stub Area Summary• Area Range Configuration• Interface Statistics• Interface Configuration• Neighbor Table• Neighbor Configuration• Link State Database• Virtual Link Configuration• Virtual Link Summary• Route Redistribution Configuration• Route Redistribution SummaryOSPF ConfigurationUse the OSPF Configuration page to enable OSPF on a router and to configure the related OSPFsettings.To display the page, click Routing →OSPF →Configuration in the tree view.
