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Cisco Systems OL-4266-08 manual Mapping QoS Labels to Queues and Drop Thresholds, 42-98

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Chapter 42 Configuring PFC QoS

Configuring PFC QoS

Mapping QoS Labels to Queues and Drop Thresholds

These sections describe how to map QoS labels to queues and drop thresholds:

Note Enter the show queueing interface {ethernet fastethernet gigabitethernet tengigabitethernet} slot/port include type command to see the queue structure of a port.

These sections describe how to map QoS labels to queues and drop thresholds:

•Queue and Drop Threshold Mapping Guidelines and Restrictions, page 42-98

•Configuring DSCP-Based Queue Mapping, page 42-98

•Configuring CoS-Based Queue Mapping, page 42-104

Queue and Drop Threshold Mapping Guidelines and Restrictions

When mapping QoS labels to queues and thresholds, note the following information:

•When SRR is enabled, you cannot map any CoS values or DSCP values to strict-priority queues.

•Queue number 1 is the lowest-priority standard queue.

•Higher-numbered queues are higher priority standard queues.

•You can map up to 8 CoS values to a threshold.

•You can map up to 64 DSCP values to a threshold.

•Threshold 0 is a nonconfigurable 100-percent tail-drop threshold on these port types:

–1p1q0t (receive)

–1p1q8t (receive)

–1p3q1t (transmit)

–1p2q1t (transmit)

•The standard queue thresholds can be configured as either tail-drop or WRED-drop thresholds on these port types:

–1p1q8t (receive)

–1p3q1t (transmit)

–1p3q8t (transmit)

–1p7q1t (transmit)

Configuring DSCP-Based Queue Mapping

These sections describe how to configure DSCP-based queue mapping:

•Configuring Ingress DSCP-Based Queue Mapping, page 42-99

•Mapping DSCP Values to Standard Transmit-Queue Thresholds, page 42-102

•Mapping DSCP Values to the Transmit Strict-Priority Queue, page 42-103

Note DSCP-based queue mapping is supported on WS-X6708-10GE ports.

	Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
42-98	OL-4266-08

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Cisco Systems OL-4266-08 Mapping QoS Labels to Queues and Drop Thresholds, Configuring DSCP-Based Queue Mapping, 42-98

Contents

A P T E R 42-142-2 Port Types Supported by PFC QoSOverview PFC QoS Feature Processing Overview 42-32shows traffic flow and PFC QoS features with a PFC3 42-43shows traffic flow and PFC QoS features with a PFC2 42-542-6 Ingress LAN Port PFC QoS FeaturesComponent Overview Flowchart of Ingress LAN Port PFC QoS Features 42-7Ingress Congestion Avoidance PFC and DFC QoS FeaturesPort Trust These sections describe PFCs and DFCs as they relate to QoSFeature Supported Policy Feature CardsPFC and DFC QoS Feature List and Flowchart Supported Distributed Forwarding Cards42-10 Ingress PFC QoSFinal Internal Dscp Value Internal Dscp ValuesInitial Internal Dscp Value 42-11Port-Based PFC QoS and VLAN-Based PFC QoS PFC QoS Egress Port FeaturesThese sections describe PFC QoS egress port features 42-1242-13 Flowchart of PFC QoS Egress LAN Port FeaturesEgress CoS Values Egress PFC QoS Interfaces Egress Dscp Mutation with a PFC3Egress ToS Byte Egress ACL Support for Remarked DscpMarking on Egress OSM Ports 42-15Ingress Classification and Marking at Trusted Ports Understanding Classification and MarkingClassification and Marking at Untrusted Ingress Ports 42-16Ingress Classification and Marking at Trust Dscp Ports Classification and Marking at Ingress OSM PortsIngress Classification and Marking at Trust CoS LAN Ports 42-1742-18 Overview of Policers PolicersClassification and Marking on the Msfc These sections describe policersAggregate Policers 42-20Microflow Policers 42-2142-22 Understanding Port-Based Queue TypesIngress and Egress Buffers and Layer 2 CoS-Based Queues 42-23 Ingress Queue Types 42-24Egress Queue Types 42-2542-26 Module to Queue Type MappingsIngress Egress Queue Drop 42-27 42-28 Feature Default Value PFC QoS Global SettingsFollowing global PFC QoS settings apply = CoS Egress CoS set from final internal Dscp valuesTransmit-Queue Limit s Default Values With PFC QoS EnabledReceive-Queue Limits 42-3042-31 Default Drop-Threshold Percentages and CoS Value MappingsBandwidth Allocation Ratios 42-32 1q2t Receive Queues1q4t Receive Queues 42-33 1p1q4t Receive Queues1p1q0t Receive Queues 1p1q8t Receive Queues 42-341q8t Receive Queues 42-352q8t Receive Queues 42-3611, 13, 15-17, 19, 21, 23 8q4t Receive QueuesStandard receive queue Threshold CoS Lowest priority 27, 29, 31, 33, 39, 41-4542-38 48-63 42-3942-40 42-41 8q8t Receive Queues2q2t Transmit Queues 1p2q2t Transmit Queues 42-421p3q8t Transmit Queues 42-431p7q4t Transmit Queues 42-4442-45 48-63 42-4642-47 Tail-drop 100% nonconfigurable1p7q8t Transmit Queues 1p3q1t Transmit Queues 42-4842-49 Default Values With PFC QoS Disabled1p2q1t Transmit Queues General Guidelines 42-5042-51 PFC3 GuidelinesWrr-queue bandwidth except Gigabit Ethernet LAN ports PFC2 Guidelines 42-52Policy Map Class Command Restrictions Class Map Command RestrictionsPolicy Map Command Restrictions Supported Granularity for CIR and PIR Rate ValuesSupported Granularity for CIR and PIR Token Bucket Sizes 42-54IP Precedence and Dscp Values 42-5542-56 Command PurposeEnabling PFC QoS Globally Default Enables ignore port trust globally on the routerDisables ignore port trust globally on the router Enabling Ignore Port Trust42-58 Configuring Dscp TransparencyEnabling Queueing-Only Mode Enabling Microflow Policing of Bridged Traffic 42-59Enabling VLAN-Based PFC QoS on Layer 2 LAN Ports 42-6042-61 Enabling Egress ACL Support for Remarked DscpCreating Named Aggregate Policers 42-62 42-63 42-64 Configuring a PFC QoS PolicyThese sections describe PFC QoS policy configuration IPv4 Yes 100 to 1300 to 2000 to IPv6 Yes named PFC QoS Policy Configuration OverviewProtocol Numbered ACLs Extended ACLs Named ACLs Yes 800 to Yes 900 to Supported only with PFC2 MAC Layer42-66 Configuring MAC ACLsConfiguring Protocol-Independent MAC ACL Filtering Enabling VLAN-Based MAC QoS Filtering 42-67Configuring MAC ACLs 42-68Configuring ARP ACLs for QoS Filtering 42-6942-70 Configuring a Class MapCreating a Class Map Clears the ACL configuration from the class map Configuring Filtering in a Class MapOptional Configures the class map to filter using an ACL Class Map Filtering Guidelines and RestrictionsVerifying Class Map Configuration 42-72Creating a Policy Map Configuring a Policy MapPolicy Map Class Configuration Guidelines and Restrictions To create a policy map, perform this task42-74 Creating a Policy Map Class and Configuring FilteringConfiguring Policy Map Class Actions 42-75 Configuring Policy Map Class MarkingConfiguring the Policy Map Class Trust State Configuring a Per-Interface Policer Configuring Policy Map Class PolicingUsing a Named Aggregate Policer 42-7642-77 42-78 Exits policy map class configuration mode Verifying Policy Map ConfigurationTo verify policy map configuration, perform this task Additional classes in the policy mapAttaches a policy map to the interface Attaching a Policy Map to an InterfaceTo attach a policy map to an interface, perform this task Removes the policy map from the interface42-81 Router# show policy-map interface fastethernet 5/36To configure a named Dscp mutation map, perform this task Configuring Egress Dscp Mutation on a PFC3Configuring Named Dscp Mutation Maps 42-82Removes the egress Dscp mutation map from Attaching an Egress Dscp Mutation Map to an InterfaceAttaches an egress Dscp mutation map to the interface 42-8342-84 Configuring Ingress CoS Mutation Maps 42-8542-86 Configuring Dscp Value MapsMapping Received CoS Values to Internal Dscp Values 42-87 Configuring Dscp Markdown ValuesConfigures a Dscp markdown map 42-88 42-89 Configures the internal Dscp to egress CoS mapMapping Internal Dscp Values to Egress CoS Values Reverts to the default trust state untrusted Configuring the Trust State of Ethernet LAN and OSM PortsConfigures the trust state of the port 42-90Configuring the Ingress LAN Port CoS Value 42-91Reverts to the default port CoS value Configuring Standard-Queue Drop Threshold PercentagesConfigures the ingress LAN port CoS value 42-92Configuring a Tail-Drop Receive Queue 42-9342-94 Configuring a WRED-Drop Transmit QueueConfiguring a WRED-Drop and Tail-Drop Receive Queue Configuring a WRED-Drop and Tail-Drop Transmit Queue 42-95Configuring 1q4t/2q2t Tail-Drop Threshold Percentages 42-96Tail-drop thresholds Configures the receive- and transmit-queue tail-dropReverts to the default receive- and transmit-queue 42-9742-98 Configuring DSCP-Based Queue MappingMapping QoS Labels to Queues and Drop Thresholds Enabling DSCP-Based Queue Mapping Configuring Ingress DSCP-Based Queue MappingConfiguring the Port to Trust Dscp 42-99Maps Dscp values to the standard receive queue Reverts to the default mappingMapping Dscp Values to Standard Receive-Queue Thresholds 42-100Queueing interface command 42-10142-102 Mapping Dscp Values to Standard Transmit-Queue ThresholdsMaps Dscp values to a standard transmit-queue Mapping Dscp Values to the Transmit Strict-Priority Queue 42-103Maps CoS values to the standard receive queue Configuring CoS-Based Queue MappingMapping CoS Values to Standard Receive-Queue Thresholds 42-10442-105 Mapping CoS Values to Standard Transmit-Queue ThresholdsMaps CoS values to a standard transmit-queue threshold 42-106 Mapping CoS Values to Strict-Priority QueuesMaps CoS values to the receive and transmit Maps CoS values to a tail-drop threshold 42-107Allocating Bandwidth Between Standard Transmit Queues 42-10842-109 Sets the size ratio between the receive queues Setting the Receive-Queue Size RatioReverts to the default size ratio 42-110Configures the strict priority queue size Configuring the Transmit-Queue Size RatioConfigures the queue size ratio between transmit queues 42-111Sample Network Design Overview Access LayerDistribution and Core Interswitch Links 42-11242-113 Identify the SAP Traffic from the PC Dvlan Identify the Voice Signaling Traffic from an IP Phone VvlanIdentify the Voice Traffic from an IP Phone Vvlan 42-11442-115 Set dscp efAccepting the Traffic Priority Value on Interswitch Links 42-116Prioritizing Traffic on Interswitch Links 42-11742-118 CoS from DSCP-to-CoS map Output Queue Voice Strict Priority Voice signaling Queue 2, ThresholdTraffic Type 42-11942-120 Using Policers to Limit the Amount of Traffic from a PCClass map commands To monitor the policing operation, use these commands 42-121PFC QoS Glossary 42-12242-123 42-124