Chapter 5: OSPF Configuration Guide60 SmartSwitch Router User Reference ManualOSPF MultipathThe SSR also supports OSPF and static Multi-path. If multiple equal-cost OSPF or staticroutes have been defined for any destination, then the SSR “discovers” and uses all ofthem. The SSR will automatically learn up to four equal-cost OSPF or static routes andretain them in its forwarding information base (FIB). The forwarding module then installsflows for these destinations in a round-robin fashion.Configure OSPFTo configure OSPF on the SSR, you must enable OSPF, create OSPF areas, assign interfacesto OSPF areas, and, if necessary, specify any of the OSPF interface parameters.To configure OSPF, you may need to perform some or all of the following tasks:• Enable OSPF.• Create OSPF areas.• Create an IP interface or assign an IP interface to a VLAN.• Add IP interfaces to OSPF areas.• Configure OSPF interface parameters, if necessary.Note: By default, the priority of an OSPF router for an interface is set to zero, whichmakes the router ineligible from becoming a designated router on the network towhich the interface belongs. To make the router eligible to become a designatedrouter, you must set the priority to a non-zero value.The default cost of an OSPF interface is 1. The cost of the interface should beinversely proportional to the bandwidth of the interface; if the SSR has interfaceswith differing bandwidths, the OSPF costs should be set accordingly.• Add IP networks to OSPF areas.• Create virtual links, if necessary.Enable OSPFOSPF is disabled by default on the SSR.To enable or disable OSPF, enter one of the following commands in Configure mode.Enable OSPF. ospf startDisable OSPF. ospf stop
