# Configuring QoS

QoS is a suite of features that configure queuing and scheduling on the forwarding path of your E Series router. QoS provides a level of predictability and control beyond the best-effort service that is the E Series router’s default data delivery service. Packets not assigned to a specific traffic class are carried in the best-effort traffic class. Best-effort service provides packet transmission with no guarantee of results.

The major QoS features that the E Series router provides are:

- Multiple traffic classes
- Configurable scheduling
- Configurable buffer management

For information about configuring QoS, see JunosE Quality of Service Configuration Guide.