The Everything Feed - All Packet Pushers Pods N4N048: QoS Fundamentals
16 snips
Feb 5, 2026 A lively walkthrough of Quality of Service fundamentals and the common acronyms that come with it. They cover when QoS helps and when bandwidth is the real solution. Topics include marking strategies like DSCP and ECN, queueing and scheduling approaches, congestion avoidance techniques, and traffic conditioning with shaping versus policing.
AI Snips
Chapters
Transcript
Episode notes
Shaper Saved Real‑Time Payment Traffic
- Ethan deployed a shaper to protect payment card transactions from FTP elephant flows.
- He limited FTP to half the WAN so real‑time payments always had capacity.
Carve Bandwidth With CBWFQ And LLQ
- Use CBWFQ to allocate bandwidth per traffic class and let unused bandwidth be shared.
- Combine CBWFQ with a low‑latency queue for realtime traffic like voice.
Protect Realtime Flows Without Starving Others
- Low Latency Queuing protects realtime flows but caps their bandwidth to prevent starvation.
- Map a small set of delay‑sensitive classes into LLQ and serve the rest via CBWFQ.