Rip introduction

Dynamic routing protocol ——RIP

characteristic ： Routing information protocol RIP（Routing Information Protocol） For short , It is a protocol based on distance vector algorithm , Use hops as a measure to
Measure the distance to the destination network .RIP It's mainly used in smaller networks
1） Simple configuration
2） Easy to maintain
3） Suitable for small and medium-sized networks
RIP—— Routing information protocol
1） Distance vector routing protocol , Belong to IGP agreement
2） Suitable for small and medium-sized networks , Yes RIPv1 and RIPv2 Two versions
3） be based on UDP, Target port number 520
4） Cycle update
5） Support horizontal segmentation 、 The mechanism of toxicity reversion and trigger renewal
working principle ：

1. Router operation RIP after , Route update request will be sent first , The router that receives the request will send its own RIP Route to respond
2. When the network is stable , The router will periodic (30s) Send route update information （ Update the routing table with each other ）
RIP—— measurements

1.RIP Use Hops As a measure of the distance to the destination network
2. By default , The number of routing hops of direct network is 0, When the router sends a route update , Will be able to Measure plus 1
2.RIP The regulations exceed 15 Jump to network unreachable , This is a RIP The protocol can only be used in small and medium-sized networks （16 Can't jump ）
RIPv1 and RIPv2
RIPv1：
1.RIPv1 yes Some kind Don't the routing protocol , I won't support it VLSM and CIDR
2. With radio broadcast Send a message in the form of
3. Authentication is not supported
RIPv2:
1.RIPv2 by No class Don't the routing protocol , Support VLSM. Support routing polymerization And CIDR
2. Support broadcasting or Multicast (224.0.0.9) Send a message by
3. Support clear text authentication and MD5 Ciphertext Authentication
RIP The loop