QoS - Quality of Service - is how you give priority to traffic that needs it (voice, video) over traffic that does not (bulk file copies, software updates). The first step is CLASSIFICATION (identifying traffic that needs special treatment) and MARKING (tagging the packet with a DSCP or CoS value so other devices recognize the priority). This lab configures classification + marking on R1 with class-maps and a policy-map.
What you will learn
- Class-maps and how they match traffic
- Policy-maps and how they apply actions
- DSCP values: EF (Expedited Forwarding), AF41 (Assured Forwarding for video), default
- How service-policies attach to interfaces
What this lab does NOT cover
- Queueing implementation (LLQ + CBWFQ) - that is the next lab, ips-10
- Policing and shaping
- Trust boundary concepts
Topology
Download the CCNA Base Topology .yaml
3 iol-xe routers + 1 alpine + 1 ioll2-xe managed switch.