1-2Application Environment of Static RoutingBefore configuring a static route, you need to know the following concepts:1) Destination address and maskIn the ip route-static command, an IPv4 address is in dotted decimal format and a mask can be eitherin dotted decimal format or in the form of mask length (the digits of consecutive 1s in the mask).2) Output interface and next hop addressWhile configuring a static route, you can specify either the output interface or the next hop addressdepending on the specific occasion. The next hop address can not be a local interface IP address;otherwise, the route configuration will not take effect.In fact, all the route entries must have a next hop address. When forwarding a packet, a router firstsearches the routing table for the route to the destination address of the packet. The system can find thecorresponding link layer address and forward the packet only after the next hop address is specified.When specifying the output interface, note that:z If the output interface is a Null 0 interface, there is no need to configure the next hop address.z If you specify a broadcast interface (such as a VLAN interface) as the output interface, you mustspecify the corresponding next hop for the output interface.3) Other attributesYou can configure different preferences for different static routes so that route management policies canbe applied more flexibly. For example, specifying the same preference for different routes to the samedestination enables load sharing, while specifying different preferences for these routes enables routebackup.Configuring a Static RouteConfiguration PrerequisitesBefore configuring a static route, you need to finish the following tasks:z Configure the physical parameters for related interfacesz Configure the link-layer attributes for related interfacesz Configure the IP addresses for related interfacesConfiguration ProcedureFollow these steps to configure a static route:To do… Use the command… RemarksEnter system view system-view —Configure a staticrouteip route-static dest-address { mask | mask-length }{ next-hop-address | interface-type interface-numbernext-hop-address } [ preference preference-value ][ description description-text ]RequiredBy default,preference forstatic routes is 60,tag is 0, and nodescriptioninformation isconfigured.
