Rip in routing

Static routing and dynamic routing
Static routing
Routing entries manually configured by the network administrator
Dynamic routing
So after the router runs the same routing protocol , Routers communicate with each other , Exchange and calculate the routing information of the unknown network segment

Advantages and disadvantages of dynamic routing
advantage
1、 Dynamic routing configuration is simple
2、 Dynamic routing can automatically converge based on the change of topology
shortcoming
1、 Because there is the sending of data packets , May take up additional resources （ Bandwidth resources , Hardware resources ）
2、 There may be security risks
3、 Because dynamic routing uses a single algorithm to calculate the path , Therefore, poor route selection may occur , There may even be a loop

Dynamic routing classification （ According to the scope ）
IGP（ Internal gateway protocol ）
Dynamic routing protocol applied in autonomous system
EGP（ External gateway protocol ）
Dynamic routing protocol applied between autonomous systems

RIP
Routing information protocol
It adopts asynchronous periodic update

1、R2 take 2.0 The routing information of the network segment is sent to R1, however ,R1 Local did not arrive 2.0 Routing information of network segment . be R1 Refresh the routing information to the local router .

2、R2 take 2.0 The routing information of the network segment is sent to R1, however ,R1 Local presence arrives 2.0 Routing information of network segment , also , The next jump is also R2. be R1 take R2 The routing information sent is refreshed to the local router .

3、R2 take 2.0 The routing information of the network segment is sent to R1, however ,R1 Local presence arrives 2.0 Routing information of network segment , also , The next jump is not R2. Then compare the cost value , If the local cost value is greater than R2 The cost value sent , be R1 take R2 The message sent is refreshed to the local routing table .

4、R2 take 2.0 The routing information of the network segment is sent to R1, however ,R1 Local presence arrives 2.0 Routing information of network segment , also , The next jump is not R2. Then compare the cost value , If the local cost value is less than R2 The cost value sent , be R1 Will not refresh .

RIPV1 and RIPV2 The difference between
1、RIPV1 There are categories of routing protocols ,RIPV2 Is a classless routing protocol
2、RIPV1 Manual authentication is not supported ,RIPV2 Support manual authentication
3、RIPV1 It transmits routing information in the form of broadcast ,RIPV2 It transmits routing information in the form of multicast

Switch flooding scenario
1、 Encounter broadcast frame
2、 Encounter multicast frame
3、 Encountered unknown unicast frame

RIP The main reason for choosing periodic updates
1、 There is no confirmation mechanism
2、 There is no survival mechanism

RIP It's a loop problem
1、15 Jump limit
2、 Trigger update
Transmit the change information at the moment of topology change
3、 Horizontal segmentation
The information learned from which interface will no longer be sent out from this interface
4、 Poison Reverse
The information learned from which interface can still be sent from this interface , But it must be poisonous

RIP Basic configuration
1、 start-up RIP process
2、 Choose the version
3、 Declare

RIP Extended configuration
1、RIPV2 Manual certification
2、RIPV2 Manual summary
3、 Default route
4、 Speed up convergence