Mqc - Cisco Nexus 5000 Series Configuration Manual
Nx-os quality of service
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Also See for Nexus 5000 Series:
- Cli configuration manual (660 pages) ,
- Configuration manual (334 pages) ,
- Command reference manual (196 pages)
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MQC
switch(config-sys-qos)# service-policy type qos input fcoe-default-in-policy
switch(config-sys-qos)# service-policy type network-qos fcoe-default-nq-policy
Standard Ethernet is a best-effort medium which means that it lacks any form of flow control. In the event
Note
of congestion or collisions, Ethernet will drop packets. The higher level protocols detect the missing data
and retransmit the dropped packets.
Fibre Channel requires a reliable transport system that guarantees the delivery of every packet. To properly
support FCoE, Ethernet has been enhanced with a priority flow control (PFC) mechanism to prevent
congestion.
MQC
The Cisco Modular QoS CLI (MQC) provides a standard set of commands for configuring QoS.
You can use MQC to define additional traffic classes and to configure QoS policies for the whole system and
for individual interfaces. Configuring a QoS policy with MQC consists of the following steps:
1 Define traffic classes.
2 Associate policies and actions with each traffic class.
3 Attach policies to logical or physical interfaces as well as at the global system level.
MQC provides two command types to define traffic classes and policies:
• class-map—Defines a class map that represents a class of traffic based on packet-matching criteria.
• policy-map—Defines a policy map that represents a set of policies to be applied on a class-by-class
You define the following class-map and policy-map object types when you create them:
• network-qos—Defines MQC objects that you can use for system level related actions.
• qos—Defines MQC objects that you can use for classification.
• queuing—Defines MQC objects that you can use for queuing and scheduling.
The qos type is the default for the class-map and policy-map commands, but not for the service-policy
Note
which requires that you specify an explicit type.
You can attach policies to interfaces or EtherChannels as well as at the global system level by using the
service-policy command.
You can view all or individual values for MQC objects by using the show class-map and show policy-map
commands.
Cisco Nexus 5000 Series NX-OS Quality of Service Configuration Guide
6
Class maps are referenced in policy maps.
The class map classifies incoming packets based on matching criteria, such as the IEEE 802.1p CoS
value. Unicast and multicast packets are classified.
basis to class maps.
The policy map defines a set of actions to take on the associated traffic class, such as limiting the
bandwidth or dropping packets.
Configuring QoS
OL-20921-01
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