Static Route Configuration With 3Com SwitchesYou can set up an interconnecting network with thestatic route configuration. The problem for such configuration is when a fault occursto the network, the static route cannot change automatically to steer away from thenode causing the fault, if without the help of an administrator.In a relatively simple network, you only need to configure the static routes to makethe router work normally. The proper configuration and usage of the static route canimprove the network performance and ensure the bandwidth of the importantapplications.All the following routes are static routes:1. Reachable route: A normal route is of this type. That is, the IP packet is sent to thenext hop using the route marked by the destination. It is a common type of staticroutes.2. Unreachable route: When a static route to a destination has the rejectattribute, all the IP packets to this destination will be discarded, and theoriginating host will be informed destination unreachable.3. Blackhole route: If a static route to a destination has the blackhole attribute,the outgoing interface of this route is the Null 0 interface regardless of the nexthop address, and all the IP packet addressed to this destination are droppedwithout notifying the source host.Default route is very useful in the networks. Suppose that there is a typical network,which consists of hundreds of routers. In that network, far from less bandwidthwould be consumed if you put all kinds of dynamic routing protocols into use withoutconfiguring a default route. Using the default route could provide an appropriatebandwidth, even not achieving a high bandwidth, for communications between largenumbers of users.IP address and maskThe IP address and mask are in a dotted decimal format. As 1s in the 32-bitmask is required to be consecutive, the dotted decimal mask can also be replacedby the mask-length (which refers to the digits of the consecutive 1s in themask).Next hop address and NULL interfaceWhen configuring a static route, you can specify the next-hop to decide the nexthop address. In fact, for all the routing items, the next hop address must bespecified. When IP layer transmits a packet, it will first search the matching routein the routing table according to the destination address of the packet. Only whenthe next hop address of the route is specified can the link layer find thecorresponding link layer address, and then forward the packet according to thisaddress.Networking diagram of the static route configuration example

Configuration procedure1 Configure the static route for Ethernet Switch A[ Switch A] ip route-static 1.1.3.0 255.255.255.0 1.1.2.2[ Switch A] ip route-static 1.1.4.0 255.255.255.0 1.1.2.2[ Switch A] ip route-static 1.1.5.0 255.255.255.0 1.1.2.22 Configure the static route for Ethernet Switch B[ Switch B] ip route-static 1.1.2.0 255.255.255.0 1.1.3.1[ Switch B] ip route-static 1.1.5.0 255.255.255.0 1.1.3.1[ Switch B] ip route-static 1.1.1.0 255.255.255.0 1.1.3.13 Configure the static route for Ethernet Switch C[ Switch C] ip route-static 1.1.1.0 255.255.255.0 1.1.2.1[ Switch C] ip route-static 1.1.4.0 255.255.255.0 1.1.3.24 Configure the default gateway of the Host A to be 1.1.5.15 Configure the default gateway of the Host B to be 1.1.4.16 Configure the default gateway of the Host C to be 1.1.1.1