Static routing (detailed)

One 、 How routers work

              The function of the router ： Forward data to the right destination , And choose the best path .

              How routers work ：

  working principle ： host 1.1 Want to communicate with the host 4.1 Communications , Data from 1.1 come out , The router receives data , The destination address in the packet is 4.1 Lookup routing table , From... Through the routing table S0 Out of the mouth , The router receives data and finds out from the routing table E0 Out of the mouth . 

1.1 Routing table

        （ When the router is not configured ip when , The routing table is empty , After configuration, the routing table will automatically add the information of the web address ）

         1 Direct link routing ： The network segment connected to yourself  

         2： Indirect routing

         3： Static routing ： Manually configured by myself （ Is one-way , Bidirectional configuration needs to continue , Not very flexible but very fast ）

          4： Dynamic routing ： In the network, routers learn the network segments they don't have by themselves through packets

          #### Check the routing table on the router ：display ip routing-table protocol direct

            The priority of the default route is 60, The smaller the better Parameters preference 

• The router queries the routing table , Realize data forwarding
• There are two ways to form a routing table: static addition and dynamic learning
• Static route is the route information manually added by the operator
• The default route is a special static route

Without any reason ARP： Detect whether the address exists

Two 、 Comparison between route and switch

3、 ... and 、 Network topology

Default route ：ip route-static 0.0.0.0 0.0.0.0 Next hop interface address ）

Static routing ：ip route-static Destination address segment Subnet mask   Next hop interface address ）

Routers can set up many routes to jump to other places

Four ： summary

  Make sure the address of the next hop of the static route , In order to better use static routing