Design and configuration on Junos class of Service (CoS) in a service provider network

A service provider network has to transmit different kinds of data through the network. Sometimes there may be multiple packets arriving at the router at the same time. There can be some important, latency-sensitive packets that are to be transmitted without delay. In this case, Class of Service (CoS) is the solution. Class of Service is a way of managing traffic in a network by grouping traffic together and treating each type as a class with its own level of service priority. Here, the CoS is implemented under Junos platform. Junos OS class of service (CoS) enables you to divide traffic into classes and offer various levels of throughput. This allows packets to be transmitted according to rules that we configure. CoS allows us to treat traffic differently by providing a minimum bandwidth guarantee, low latency, low packet loss, or a combination of these things for categories of traffic.

As part of implementation of project, we will be designing a Service provider Network with real-time routers. We will then implement the Class of Service (CoS) on this live network. For this purpose we need two Juniper SRX-series service provider routers with Giga Ethernet ports. Implementing the Class of Service includes configuring IP(Internet Protocol) addresses to interfaces, configuring Open Shortest Path First (OSPF) Protocol and finally configuring Class of Service (CoS). During the process of implementing routing protocol, various import and export policies are used to control which incoming routes are chosen and which outing routes are propagated and firewall filters are used to categorize traffic. Project is achieved using Junos software, its Command Line Interface (CLI) and XML. Junos Operating System is a high performance network operating system for routing switching and security.