Reference Guide

trust
Specify dynamic classification (DSCP) or dot1p to trust.
S4820T
Syntax
trust {diffserv [fallback]| dot1p [fallback]}
Parameters
diffserv Enter the keyword diffserv to specify trust of DSCP markings.
dot1p Enter the keyword dot1p to specify trust dot1p configuration.
fallback Enter the keyword fallback to classify packets according to their
DSCP value as a secondary option in case no match occurs against
the configured class maps.
Defaults none
Command Modes CONFIGURATION (conf-policy-map-in)
Command History
This guide is platform-specific. For command information about other platforms, refer to the
relevant FTOS Command Line Reference Guide .
The following is a list of the FTOS version history for this command.
Version 8.3.19.0 Introduced on the S4820T.
Version 8.3.11.1 Introduced on the Z9000.
Version 8.3.7.0 Introduced on the S4810.
Version 8.3.1.0 Added fallback to the E-Series.
Version 8.2.1.0 Added dot1p to the C-Series and S-Series.
Version 7.6.1.0 Introduced on the S-Series.
Version 7.5.1.0 Introduced on the C-Series.
Version 7.4.1.0 Added dot1p and IPv6 DSCP.
pre-Version
6.1.1.1
Introduced on the E-Series
Usage
Information
When you configure trust, matched bytes/packets counters are not incremented in the
show qos statistics command.
Dynamic mapping honors packets marked according to the standard definitions of DSCP. The
following lists the default mapping.
DSCP/CP hex
Range (XXX)
DSCP Definition Traditional IP
Precedence
S-Series
Internal Queue
ID
DSCP/CP
Decimal
111XXX Network Control 3 48–63
110XXX Internetwork
Control
3 48–63
1133