QoS Behavior Differences

The implementation of QoS is similar in all VOSS switches but there are some differences as summarized in the following table.

QoS

VSP 4450 Series

VSP 7200 Series/VSP 8000 Series/VSP 4900 Series

5520 Series/VSP 7400 Series

VSP 8600 Series

XA1400 Series

Ingress traffic

Policing

Port-rate limiting

Not available

Port-rate limiting

Not available

Egress traffic

Shaping

Shaping

Shaping

Shaping

Follows default queue profile weights

Egress queuing CoS 0–5

WDRR

WRR

WRR

WRR

Heirarchy Token Bucket (HTB)

Classification

Routed packet classification

No routed packet classification

No routed packet classification

No routed packet classification

No routed packet classification

Internal QoS derivation for ingress Layer 3 trusted port

  • Routed IP packet-derived from DSCP

  • Switched IP packet-derived from 802.1p

Always derived from DSCP

Always derived from DSCP

Always derived from DSCP

Always derived from DSCP

Automatic QoS

Always derived from DSCP

Always derived from DSCP

Always derived from DSCP

Not Supported on 5520 Series

Derived from DSCP for routed traffic only. Automatic QoS is not available for switched traffic.

Always derived from DSCP

For QoS scaling and filter scaling information, see Release Notes for VOSS.