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Dell PowerEdge FN I/O Module Configuration Guide 9.10(0.0)

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Honoring DSCP Values on Ingress Packets

The Dell Networking OS provides the ability to honor DSCP values on ingress packets using Trust DSCP feature.

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The following table lists the standard DSCP definitions and indicates to which queues the Dell Networking OS maps DSCP values. When you configure trust DSCP, the matched packets and matched bytes counters are not incremented in the show qos statistics command.

  • NOTE: Packets with DSCP value of 63 are dropped.
Table 1. Default DSCP to Queue Mapping
DSCP/CP hex range (XXX)xxx DSCP Definition Traditional IP Precedence Internal Queue ID DSCP/CP decimal
111XXX   Network Control 3 48–63
110XXX   Internetwork Control 3 48–63
101XXX EF (Expedited Forwarding) CRITIC/ECP 2 32–47
100XXX AF4 (Assured Forwarding) Flash Override 2 32–47
011XXX AF3 Flash 1 16–31
010XXX AF2 Immediate 1 16–31
001XXX AF1 Priority 0 0–15
000XXX BE (Best Effort) Best Effort 0 0–15
Enable the trust DSCP feature. POLICY-MAP-IN mode trust diffserv

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