Cisco QOS Knowledge Detailed first three models

As an effort in the IT line struggle people, inspirational to do the following points:

Moved the machine, played the system, proficient in the protocol, hit the code.

--I want to keep my efforts!

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Three models of QoS

Network Service quality is QoS, the implementation of QoS in the network, there are three models need reference, to guide the various requirements, how to implement QoS:

Best-effort Service Best Effort Services model

in the best effort service model, all network equipment is to do their best to transfer data, all the data, despite the transmission, do not need to get permission, how much, no data can be guaranteed, delay can not be expected, so the best efforts service model, actually did not implement any QoS, The default network works under this model.

Integrated Service Integrated services model, referred to as IntServ

Before the application sends the data, it must request bandwidth to the network, and when some program traffic needs absolute bandwidth, it can secure its traffic by requesting bandwidth in the network of the integrated service model, and when requesting bandwidth, the protocol used is resource reservation Protocol ( RSVP). In the Integrated services model, important data can be guaranteed by requesting bandwidth, but must be applied before transmission, and additional time is required, and in existing networks, the QoS of the integrated service model is not usually adopted.

Differentiated service Differentiated Services model, referred to as DiffServ

The network will provide different services according to different data, therefore, all data are divided into different categories, or set to a different priority, when the network congestion, the network always first guarantee the transmission of high-priority data, thereby discarding the transmission of low-priority data, but when the network is not congested, All data is transmitted as usual. In implementing QoS differentiated service models, you must first divide the data into different categories, or set different priority levels. In today's networks, a differentiated services model is typically used when implementing QoS.

This article is from the "It is not a thing" blog, please make sure to keep this source http://imccie.blog.51cto.com/4710872/1749993

Cisco QOS Knowledge Detailed first three models