The Static Routing
The router adds the remoter network to the routing table by configuring the static routes or configuring the dynamic route. When the router learn about the remoter network and the interface through which the packet send to the remote network, it adds the information of that router in the routing rable.A static route include the network address and subnet mask of the remote network with the ip address of the next hop router or the exit interface. Static router is denoted as S in the routing table.
When to use the static routing in the router to reach the destination-
1. When a network consist of only few routers so that the network administrator manually configure all the remote router and set up interfaces
2. When the network is connected to the internet through the single IP.In this point there is no use of dynamic routing protocol because ISP only one exit point to the internet.
3. When the large network is configured into hub and spoke topology because each location only has one path to a given destination through the main network.
In the static routing when there is any change or the network failure occurs between two hosts, this change is not route through the network as in dynamic routing protocol. It means after the troubleshooting of the network packet can route.
Static routing command-
Static routes are commonly used when routing from a network to a stub network stub network is a network accessed by a single route. The command is-
Router (config) # ip route (destination network id) (mask of destination network) (next-hop address or exit interface)
This is an advantage to using exit interface in the static routes. The routing table process only has to perform a single lookup to find the exit interface to resolve a next- hop address. For static routes with outbound point to point serial network, it is best to configure the static routes with only the exit interface. For point to point serial interfaces, the next hop address in the routing table is never used by the packet delivery procedure, so it is not needed. For the static route with outbound Ethernet network, it is best to configure the static routes with the both next-hop address and exit interface.
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