Cisco Catalyst 3750 Metro Command Reference Manual page 771

Chapter 2 Catalyst 3750 Metro Switch Cisco IOS Commands
If you specify trust ip-precedence, QoS uses the IP precedence value from the ingress packet and the
IP-precedence-to-DSCP map. For non-IP packets that are tagged, QoS uses the received CoS value; for
non-IP packets that are untagged, QoS uses the default port CoS value. In either case, the DSCP for the
packet is derived from the CoS-to-DSCP map.
When port trust policies are used with 802.1Q tunneling, all ports sharing the same tunnel VLAN must
be configured with the same trust policy, and the ports involved must use the same DSCP-to-DSCP
mutation map. For more information, see the
qos map" section on page
For 802.1Q tunnels, the switch processes inbound traffic on a standard port according to the trusted
setting applied to this port. For information about how the switch configures the inner and outer tags for
packets sent over the enhanced-services (ES) trunk port, see the
To return to policy-map configuration mode, use the exit command. To return to privileged EXEC mode,
use the end command.
Examples
This example shows how to define a port trust state to trust inbound DSCP values for traffic classified
with class1:
Switch(config)# policy-map policy1
Switch(config-pmap)# class class1
Switch(config-pmap-c)# trust dscp
Switch(config-pmap-c)# police 1000000 20000 exceed-action policed-dscp-transmit
Switch(config-pmap-c)# exit
You can verify your settings by entering the show policy-map privileged EXEC command.
Related Commands Command
class
police
policy-map
set
show policy-map
OL-9645-10
"mls qos dscp-mutation" section on page
2-285, and the "mls qos trust" section on page
Description
Specifies the name of the class whose traffic policy you want to
create or change.
Configures a single-rate ingress traffic policer for a class of traffic.
Creates or modifies a policy map that can be attached to multiple
ports to specify a service policy.
Classifies IP traffic by setting a CoS, a DSCP, an IP precedence, or
the multiprotocol label switching (MPLS) experimental (EXP) bits in
the packet.
Displays QoS policy maps.
Catalyst 3750 Metro Switch Command Reference
2-281, the
2-312.
"mls qos trust" section on page
trust
"mls
2-312.
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