QOS-Enabled Networks

Advanced Queuing Topics (QOS-Enabled Networks) Part 2

Using RED with TCP Sessions As discussed earlier, TCP protocols have the concept of rate optimization windows, such as congestion windows and receiving windows, which can be translated into the volume of traffic that can be transmitted or received before the sender has to wait to receive an acknowledgment. Once an acknowledgment is received, data […]

The VPLS Case Study (QOS-Enabled Networks) Part 1

We have now introduced all the different parts of the QOS equation and are ready to move forward and present two case studies that illustrate end-to-end QOS deployments in the format of case studies. The case study in this topic focuses on a VPLS (Virtual Private LAN Service) scenario, and the study in the next […]

The VPLS Case Study (QOS-Enabled Networks) Part 2

Classification and Trust Borders In terms of classification, interfaces can be divided into two groups according to what is present at the other end, either another network router or a customer device. When traffic arrives at the network from the customer (on a customer-facing interface), it is classified based on the User Priority bits present […]

The VPLS Case Study (QOS-Enabled Networks) Part 3

Queues and Scheduling at Core – Facing Interfaces The routing model so far is that all the traffic sourced from PE X to PE Y travels inside a single LSP established between the two, and the maximum number of hops crossed is four, which includes both the source and destination PE routers. If the primary […]

Case Study IP RAN and Mobile Backhaul QOS Part 1

Radio Access Networks (RANs) connect mobile base stations to the mobile backhaul network. RAN networks have evolved from 2G networks with GSM handsets to 3G, which introduces IP. However, 3G networks do not offer true IP-based service. Rather, SSGN tunnels the data portion of the traffic to GPRS routers, which act as gateways to IP-based […]

Case Study IP RAN and Mobile Backhaul QOS Part 2

Traffic on 3G Networks Voice traffic on a 3G network continues to be circuit switched, so in this sense it is identical to voice traffic on a 2G network. The difference lies in the data service packets, which are routed in a packet-based network structure. As we have discussed, an end user packet is not […]

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