Rip protocol of dynamic routing protocol

Dynamic routing protocol RIP agreement
One 、 Dynamic routing
1.1 Overview of dynamic routing
1.1.1 Dynamic routing
1.1.2 Dynamic routing features
1.1.3 Workflow of dynamic routing
1.2 Dynamic routing protocol
1.2.1 Overview of dynamic routing protocol
1.2.2 measurements
1.2.3 convergence
1.2.4 Dynamic routing protocol classification
Two 、RIP（ distance —— Vector routing protocol ）
2.1RIP Basic concepts of
2.2 The formation of routing table
2.3 RIP The measure of 、 Update time
2.4 Routing loops
2.4.1 The formation of a loop
2.4.2 Horizontal segmentation and toxicity reversal
2.5RIPv1 And RIPv2 The difference between
3、 ... and 、RIP The basic configuration command of
One 、 Dynamic routing
1.1 Overview of dynamic routing
1.1.1 Dynamic routing
Based on some kind of routing protocol

1.1.2 Dynamic routing features
（1） advantage ： Reduced management tasks
（2） shortcoming ： It's taking up the network bandwidth

1.1.3 Workflow of dynamic routing
It means that the router can learn the routing information , Form your own routing table , And it can be adjusted timely according to the changes of the actual situation .

1.2 Dynamic routing protocol
1.2.1 Overview of dynamic routing protocol
The language used to exchange information between routers

1.2.2 measurements
The router will determine the best routing path through the measurement , Including hops 、 Broadband 、 load 、 Time delay 、 reliability 、 cost

1.2.3 convergence
The process of making all routing tables in the persistent state

1.2.4 Dynamic routing protocol classification
According to the algorithm of routing execution .
Distance vector routing protocol ： The route is selected according to the number of routers from the source network to the target network （RIP,IGRP）
Link state routing protocol ： The route is selected by comprehensively considering each path from the source network to the target network （OSPF,IS-IS）

Two 、RIP（ distance —— Vector routing protocol ）
2.1RIP Basic concepts of
→ Regular updates
→ neighbor
→ Broadcast updates
→ Full route table update

2.2 The formation of routing table
① Routers learn direct routing
② Update cycle 30s then , The router sends routing tables to its neighbors
③ In another 30s, The second update cycle is to send the routing table again

2.3 RIP The measure of 、 Update time
1、RIP The metric is hops , The maximum number is 15 jump ,16 Jump to unreachable
2、RIP Update time ： every other 30s Send route update message ,UDP520 port
3、RIP The route update message is the information that sends the entire route table

2.4 Routing loops
2.4.1 The formation of a loop
When 40 After the network segment is blocked ,R3 Normally, this message will be sent , But because it exists 30s Update time of , So if R3 Before the update cycle of ,R2 Send... First , Then it will R3 This announcement of covers ,R3 Will think 40 The network segment is normal , hold 40 The normal working data of the network segment is returned R2,R2 And then send it back to ru R3, This cycle forms a loop .

2.4.2 Horizontal segmentation and toxicity reversal
Horizontal segmentation and toxicity reversal are mainly aimed at dynamic routing protocols RIP in , Avoid routing loops , Increasing the convergence rate produces .
1、 Horizontal segmentation ：
In the process of routing information transmission , The update information received by the router from an interface cannot be sent back from this interface . At the same time, it can also reduce the link bandwidth resources occupied by routing update information .
2、 Poison Reverse ：
After the router receives the routing information of a network segment from an interface , It's not that you don't send back messages , But to send , Just mark this network segment as unreachable , Send it out . After receiving such routing information , The receiving router will immediately abandon the route , Instead of waiting for it to age . This can accelerate the convergence of routing .

2.5RIPv1 And RIPv2 The difference between

3、 ... and 、RIP The basic configuration command of
[R1]rip 1 ### start-up RIP
[R1-rip-1]version 2 ## Launch version 2 ( The default is version 1)
[R1-rip-1]undo summary ## Turn off automatic route aggregation ( That is, all routing information will follow IP Address classification )
[R1-rip-1]network 192.168.10.0 ## Announce the main network number , v2 Will carry mask multicast updates 224.0.0.9, v1 Broadcast updates without mask 255.255.255.255
[R1-rip-1]network 200.1.1.0
---- Compatibility mode --------
[R1] int go/0/1
[R1-GigabitEthernet0/0/1]rip version 2 multicast ## Set to rip1 A certain interface of the router is separately set as rip edition 2
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Dynamic routing protocol 、 RIP
https://www.cnblogs.com/00huajiang/p/11358107.html
https://blog.51cto.com/yangshufan/1959692
https://blog.51cto.com/dengqi/1258780
https://blog.csdn.net/weixin_50355475/article/details/109468247
https://blog.csdn.net/qq_39689711/article/details/103751137