Chapter 7 of 11 · MikroTik MTCSWE
QoS
802.1p priority, bridge filter priority, CRS chip queues, traffic shaping and bandwidth limits in bridge and chip.
- 3topics
- 12 minfast track
Topics in this chapter
Take them in order, or jump to the one you need.
- 1Layer 2 QoS with 802.1p and Bridge Filter PriorityLearn how 802.1p priority bits mark Layer 2 traffic, and how a RouterOS bridge filter can set or keep the priority of frames…4 min
- 2CRS Priority Configuration and Switch Chip Rate LimitsUnderstand how a CRS switch chip classifies priority into hardware queues, and how ingress and egress rate limits cap a switch…4 min
- 3Traffic Shaping and Bandwidth Limits with QueuesLimit and shape bridged traffic in RouterOS with simple queues and queue trees, see how shaping differs from policing, and why…4 min
About this chapter
What this chapter covers
The QoS chapter explains how a MikroTik switch decides which frames go first, and how it limits bandwidth.
The syllabus has a single topic, Layer 2 QoS with 802.1p, and it lists five sub points. They fall into two groups: priority marking, and bandwidth control.
Three pages cover the five sub points.
How the topics fit together
Priority tells devices what matters, and rate limits decide how much traffic may flow.
The same split between the CPU and the chip appears throughout. The bridge filter and queues run on the CPU and can do many things, but they are slow.
The chip does fewer things, at full speed. Most designs mark priority in the chip and keep CPU rules for special cases.
Priority and limits solve different problems. Priority orders traffic during congestion, and limits cap it all the time.
How to use these pages
Each topic page has the same shape, so you can skim for what you need.
- What it is: the idea in plain words.
- How it works: the mechanism, with diagrams and example commands.
- What to remember for the exam: the facts to memorise.
- Common mistakes: the classic traps.
- Check yourself: three questions to test your understanding.
Read the pages in order. The first explains the priority value itself.
The second shows the same ideas in the switch chip, together with chip rate limits. The third covers queues and shaping on the CPU, and explains why they do not apply to hardware switched frames.
Build a small lab if you can. Mark a stream with a bridge filter rule, then limit another stream with a queue, and compare the counters. Seeing a rule match, or fail to match, teaches more than reading about it.
After this chapter you should be able to do the following:
- Say where the 802.1p priority is carried, and what values it can hold.
- Mark and re-mark priority on a bridge and in a chip.
- Choose between a chip rate limit and a queue.
Ready for more practice?
The full MikroTik MTCSWE question bank has 484 questions, with timed practice exams and an explanation for every answer.
This study guide is independent and is not affiliated with, endorsed by, or sponsored by MikroTik. Vendor names, certification names and exam codes are trademarks of their respective owners and are used for identification only.