Quality of Service (QoS) – Smarter Traffic Management for Smarter Networks

Quality of Service (QoS) – Smarter Traffic Management for Smarter Networks

In today’s IP networks, especially when handling voice, video, and real-time applications traffic, QoS isn’t optional—it’s essential.

QoS involves various techniques to classify, mark, queue, and schedule packets so that critical traffic gets priority. Here are a few key scheduling and congestion avoidance mechanisms:

WRR (Weighted Round Robin): Distributes bandwidth fairly across queues based on assigned weights. Higher priority queues get more transmission opportunities while still serving lower-priority traffic.

WFQ (Weighted Fair Queuing): Offers fair bandwidth allocation to different flows. It automatically classifies flows and ensures low-latency service for small, delay-sensitive packets (like voice) while still handling bulk data fairly.

WRED (Weighted Random Early Detection): A proactive congestion avoidance mechanism. Instead of waiting for buffers to overflow, WRED selectively drops lower-priority packets early based on queue thresholds—helping prevent global TCP synchronization and keeping queues under control.

These tools help ensure your network can handle congestion gracefully, minimize packet loss, and guarantee performance for critical services.

Whether you’re designing a large ISP backbone or an enterprise network, QoS is key to a robust architecture.

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Source: LinkedIn

Credits: Mr. Hardik Patel