Reference Guide

772 | Quality of Service (QoS)
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Table 38-5. Default DSCP to Queue Mapping
Honoring dot1p values on ingress packets
FTOS provides the ability to honor dot1p values on ingress packets with the Trust dot1p feature. Enable
Trust dot1p using the command
trust dot1p from POLICY-MAP-IN mode. Table 38-6 specifies the queue to
which the classified traffic is sent based on the dot1p value.
The dot1p value is also honored for frames on the default VLAN; see Priority-tagged Frames on the
Default VLAN.
Fall Back to trust diffserve or dot1p
Fall Back to trust diffserve or dot1p is available only on platforms: e
DSCP/CP
hex
range
(XXX)xxx DSCP Definition
Traditional IP
Precedence
E-Series
Internal
Queue ID
C-Series
Internal
Queue ID
S-Series
Internal
Queue ID
DSCP/CP
decimal
111XXX Network Control 7 3 3
48–63
110XXX Internetwork Control 6 3 3
101XXX EF (Expedited
Forwarding)
CRITIC/ECP 5 2 2
32–47
100XXX AF4 (Assured
Forwarding)
Flash Override 4 2 2
011XXX AF3 Flash 3 1 1
16–31
010XXX AF2 Immediate 2 1 1
001XXX AF1 Priority 1 0 0
0–15
000XXX BE (Best Effort) Best Effort 0 0 0
Table 38-6. Default dot1p to Queue Mapping
dot1p
E-Series
Queue ID
C-Series
Queue ID
S-Series
Queue ID
0211
1000
2100
3311
4422
5522
6633
7733