Concept Guide

trust
Specify dynamic classication (DSCP) or dot1p to trust.
Syntax
trust {diffserv [fallback]| dot1p [fallback]}
Parameters
diserv Enter the keyword diffserv to specify trust of DSCP markings.
dot1p Enter the keyword dot1p to specify trust dot1p conguration.
fallback Enter the keyword fallback to classify packets according to their DSCP value as a
secondary option in case no match occurs against the congured class maps.
Defaults none
Command Modes CONFIGURATION (conf-policy-map-in)
Supported Modes Full–Switch
Command History
Version Description
9.9(0.0) Introduced on the FN IOM.
8.3.16.1 Introduced on the MXL 10/40GbE Switch IO Module.
Usage Information
When you congure trust, matched bytes/packets counters are not incremented in the show qos
statistics command.
Dynamic mapping honors packets marked according to the standard denitions of DSCP. The following lists the
default mapping.
Table 2. Default Mapping
DSCP/CP hex
Range (XXX)
DSCP Denition Traditional IP
Precedence
MXL Switch
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 Eort) Best Eort 0 0–15
Quality of Service (QoS) 1097