Mqc-Based Qos Configuration - Cisco Catalyst 4500 series Administration Manual

Configuring QoS on a Standalone Supervisor Engine 6-E/6L-E or Supervisor Engine 7-E/7L-E/8-E
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MQC-based QoS Configuration

Starting with Cisco IOS Release 12.2(40)SG, a Catalyst 4900M, a Catalyst 4948E, or a Catalyst 4500
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Series Switch with Supervisor Engine 6-E or Supervisor Engine 6L-E use the MQC model of QoS.
To apply QoS, you use the Modular QoS Command-Line Interface (MQC), which is a CLI structure that
allows you to complete the following tasks:
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For more information about the MQC, see the "Modular Quality of Service Command-Line Interface"
section of the Cisco IOS Quality of Service Solutions Configuration Guide, Release 12.3.
The incoming traffic is considered trusted by default. Only when the trusted boundary feature is enabled
Note
on an interface can the port enter untrusted mode. In this mode, the switch marks the DSCP value of an
IP packet and the CoS value of the VLAN tag on the Ethernet frame as "0".
Platform-supported Classification Criteria and QoS Features
The following table provides a summary of various classification criteria and actions supported on the
Catalyst 4500 Series Switch. For details, refer to the Catalyst 4500 Series Switch Command Reference.
Supported classification actions
match access-group
match any
match cos
match [ip] dscp
match [ip] precedence
match protocol
match qos-group
Supported Qos Features
Software Configuration Guide—Release IOS XE 3.6.0E and IOS 15.2(2)E
42-48
Enabling Per-Port Per-VLAN QoS, page 42-70
Applying Flow-based QoS Policy, page 42-75
Configuring CoS Mutation, page 42-79
Configuring System Queue Limit, page 42-80
Specify the matching criteria used to define a traffic class.
Create a traffic policy (policy map). The traffic policy defines the QoS policy actions to be taken for
each traffic class.
Apply the policy actions specified in the policy map to an interface, VLAN, or port and VLAN.
Descriptions
Configures the match criteria for a class map on the basis of the specified ACL.
Configures the match criteria for a class map to be successful match criteria for all
packets.
Matches a packet based on a Layer 2 class of service (CoS) marking.
Identifies a specific IP differentiated service code point (DSCP) value as a match
criterion. Up to eight DSCP values can be included in one match statement.
Identifies IP precedence values as match criteria.
Configures the match criteria for a class map on the basis of the specified protocol.
Identifies a specific QoS group value as a match criterion. Applies only on the egress
direction.
Descriptions
Chapter 42 Configuring Quality of Service
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