Basic Content of Routing Information Protocol

Learning the basic concepts of routing information protocols will be of great help for us to deal with some routing faults in the future. Through some previous simple introductions, we know that RIP, also known as the routing information protocol, is a very early version of the routing protocol, so some features of this protocol, let's take a look at the content of this article. This article is excerpted from the Informit website that studies the basic features of the internal gateway protocol ｡

Route information protocol (RIP)

The routing information protocol was originally designed for Xerox PUP (PARC universal protocol). the routing information protocol was collectively referred to as "GWINFO" in the Xerox network system protocol in 1981 ", it was also defined as "RFC 1988" in 1058. the routing information protocol is easy to configure and works very well in small networks. However, in large networks, the routing information protocol is inefficient. As I said to myself, the routing information protocol will split your network. In large network environments, there is a protocol to replace the routing information protocol. The Routing Information Protocol has the following characteristics:

1. open protocols are widely used and stable ｡

2. Suitable for small networks and easy to configure ｡

3. There is a distance vector routing information protocol similar to the routing information protocol for Novell and AppleTalk software ｡

4. Internal Gateway Protocol (IGP)

5. IP route information protocol updates are broadcast once every 30 seconds (the multicast addresses of all RIPv2 routers are 224.0.0.9 )｡

6. UDP (User Datagram Protocol) Port 520 ｡

7. The manageable distance is 120 ｡

8. A single measurement criterion is the number of computing hops (the limit is 15 and the count is infinite )｡

9. The timer helps adjust performance ｡

Update timer-the frequency of Route updates. A complete route table is sent every 30 seconds based on the horizontal split) illegal timer-content not refreshed in route updates. The route information protocol waits for 180 seconds, and then marks a route as illegal and immediately puts the route in a restrained timing state ｡

Maintain timing and trigger updates-help with stable routing in Cisco magic. suppressing timing ensures that normal updates do not properly cause route loops. routers do not offer superior performance during a specific period of time. the suppression time of the routing information protocol is 180 seconds. Refresh the timer -- before the routing information protocol deletes the route from the routing table, wait an additional 240 seconds ｡