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# 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.

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