Updating routing table
The router makes the routing decision according to the “routing table” maintained by the router, which is a list of the preferred routes to various networks.
When receiving a packet, the router looks up the packet's destination IP in the routing table, find the best match, then send the packets to the specified interface and gateway IP address.
The main difference between policy-based routing and static/ dynamic routing is that policy-based routing allows the router to make routing decisions not only base on the destination IP address, but also criteria such as protocol, source IP address, and destination port.
This primary purpose of policy-based routing no longer is to select the route that is more likely to reach the destination; instead, it is more like setting up a regulation to restrict certain types of traffic to a particular path.
There are several routing protocols to achieve dynamic routing.This article introduces the basic concept of routing and the types of routing supported by Vigor Router.By the end of this article, we hope the readers will be able to read the routing table and get useful information from it, as well as understand how to add routing information and policies on Vigor Router.After that, the router will periodically exchange routing information on this LAN interface through multicast packets.The routing information learned by RIP from the other routers will be listed on the routing table as well, and there will be an “R” mark.