1. RIP:

Routing information protocol (1)

(2) based on distance vector algorithm

(3) belong to the IGP agreement

(4) is suitable for small and medium-sized network

(5) RIPv1 and RIPv2

6 for routing information interaction, using UDP port number of 520

All landowners periodic update: each router periodically to the direct connect other router to send its own routing table

2. RIP routing table form: (1) RIP starts, r1 r2 to radio sends a Request message,

(2) after the Request message received r1, r2 to the routing table encapsulated in Reponse message broadcast r1,

Received (r1 r2 Reponse message sent, form a routing table,

3. RIP routing table updates principle:

Item (1) of this routing table for routing, when sending a message gateway phase at the same time, regardless of the measurement value rise or fall, all update this by item (metric value will only reset aging time) at the same time,

(2) of this routing table for routing, when sending a message gateway is not at the same time, only when the measurements to reduce, update this by,

Item (3) the routing of this are not present in the routing table, the measurement value is less than (16), in which the increase in the table which by item,

//update parameters: the update time of 30 s, 180 largest aging time, waste time 120 s,

4. Version:

RIPv1: classful routing protocol, does not support VLSM and CIDR, send a message in the form of broadcast, does not support authentication,

RIPv2: no category routing protocol, support VLSM, routing aggregation and CIDR, broadcast or multicast (224.0.0.9), support the plaintext certification and accreditation of MD5 ciphertext

//configuration commands:

Rip

Ver 2

.net 192.168.1.0

Routing aggregation
5.
(1) only support RIPv2,

(2) by default, RIP can enable routing aggregation work;

//shutdown command (undo the summary)

Routing proof ring
6.
(1) the level of segmentation: RIP routers receive routing from an interface won't notice back from the interface,

(2) toxicity reverse: from the interface Response message sent to measure the value of 16 jump, remove useless in the other routing table routing,

(3) triggered update: when the router topology perception or RIP routing metric values change, it does not wait for the next update cycle can immediately send the Response message,//to accelerate network convergence

7. Verify the way:

1) RIPv2 supports: plaintext authentication, ciphertext certification,

2) RIP faults:

1) update the unreliable (rumor routing protocol),

(2) the hop limit, 16 for inaccessible,

(3) the distance vector model, is not sensitive to link bandwidth,