Hello,
whats the benefits and requirement of dynamic if everything works with static ?
Truth be told, this is a fundamental, and even slightly philosophical question, and one that opens a very wide door for answers.
Dynamic routing, as its name suggests, is an approach by which the contents of the routing tables on routers (and multilayer switches) adapt dynamically, in real time, to any change in the network. Dynamic routing necessarily requires the routers to actively cooperate in populating their routing tables by collecting, disseminating, and processing information about reachable destinations in the network and possible paths to them. In the end, a network that runs a dynamic routing protocol requires little to no manual intervention when a change occurs; the routing protocol will attempt to update the routing tables to always reflect on the currently reachable destinations, and best paths toward them.
In networks that are stable, such as data centers, dynamic routing may be of little use if the static routing is working fine, and the amount of manual configuration work needed to implement a change is manageable. However, not all networks work this way. For example, with service providers whose clients connect and disconnect, advertise their own networks, the need to (re)configure all affected routers manually would not be realistic. Even in a large network that is relatively stable, configuring hundreds or thousands of routing table entries manually, on tens or hundreds of routers, is an insurmountable task, not to mention the absolute lack of automated adaptivity if the network changed (a link or a router fails, or a new link or a router comes up).
The main advantages of dynamic routing are, therefore:
- After initial routing protocol configuration, routing tables are populated automatically
- Routing table contents are always up-to-date
I am sure other friends here will add their own views and observations.
Please feel welcome to ask further!
Best regards,
Peter
