11
Router A
Router B
Router H
Router E
16.0.0.2
17.0.0.3
15.0.0.0
12.0.0.0
17.0.0.0
11.0.0.0
16.0.0.0
13.0.0.0
14.0.0.0
Router C
Router D
Router F
Router G
11.0.0.1
12.0.0.1
12.0.0.2
15.0.0.1
15.0.0.2
17.0.0.1
16.0.0.1
13.0.0.1
13.0.0.2
14.0.0.1
14.0.0.2
14.0.0.3
14.0.0.4
17.0.0.2
11.0.0.2
13.0.0.3
Destination Network
Nexthop
Interface
11.0.0.0 11.0.0.1 2
12.0.0.0 12.0.0.1
1
13.0.0.0 12.0.0.2
1
14.0.0.0 14.0.0.4 3
15.0.0.0 14.0.0.2
3
16.0.0.0 14.0.0.2
3
17.0.0.0 11.0.0.2 2
Routing protocol overview
Static routing and dynamic routing
Static routing is easier to configure and requires fewer system resources. It works well in small, stable
networks with simple topologies. Its major drawback is that you must reconfigure it whenever the network
topology changes; it cannot self-adjust to network changes.
Dynamic routing is based on dynamic routing protocols, which can detect network topology changes and
recalculate the routes accordingly; therefore, dynamic routing is suitable for large networks. Its
disadvantages are that it is difficult to configure, imposes higher requirements on the system, and
consumes network resources.
Routing protocols and routing priority
Different routing protocols may find different routes to the same destination. However, not all of those
routes are optimal. At a particular moment, only one protocol can uniquely determine the current optimal
route to the destination. For the purpose of route selection, each routing protocol (including static routes) is
assigned a priority. The route found by the routing protocol with the highest priority is preferred.
