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Cisco Systems OL-4266-08 manual 1p1q4t Receive Queues, 1p1q0t Receive Queues, 42-33

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Chapter 42 Configuring PFC QoS

PFC QoS Default Configuration

1p1q4t Receive Queues

Feature			Default Value

Standard receive queue	Threshold 1	CoS	0 and 1

		Tail-drop	50%

		WRED-drop	Not supported

	Threshold 2	CoS	2 and 3

		Tail-drop	60%

		WRED-drop	Not supported

	Threshold 3	CoS	4

		Tail-drop	80%

		WRED-drop	Not supported

	Threshold 4	CoS	6 and 7

		Tail-drop	100%

		WRED-drop	Not supported

Strict-priority receive queue		CoS	5

		Tail-drop	100% (nonconfigurable)

1p1q0t Receive Queues

Feature		Default Value

Standard receive queue	CoS	0, 1, 2, 3, 4, 6, and 7

	Tail-drop	100% (nonconfigurable)

	WRED-drop	Not supported

Strict-priority receive queue	CoS	5

	Tail-drop	100% (nonconfigurable)

	Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX

OL-4266-08		42-33
OL-4266-08		42-33

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Cisco Systems OL-4266-08 manual 1p1q4t Receive Queues, 1p1q0t Receive Queues, 42-33

Contents

42-1 A P T E RPort Types Supported by PFC QoS Overview42-2 42-3 PFC QoS Feature Processing Overview42-4 2shows traffic flow and PFC QoS features with a PFC342-5 3shows traffic flow and PFC QoS features with a PFC2Ingress LAN Port PFC QoS Features Component Overview42-6 42-7 Flowchart of Ingress LAN Port PFC QoS FeaturesPort Trust PFC and DFC QoS FeaturesIngress Congestion Avoidance These sections describe PFCs and DFCs as they relate to QoSPFC and DFC QoS Feature List and Flowchart Supported Policy Feature CardsFeature Supported Distributed Forwarding CardsIngress PFC QoS 42-10Initial Internal Dscp Value Internal Dscp ValuesFinal Internal Dscp Value 42-11These sections describe PFC QoS egress port features PFC QoS Egress Port FeaturesPort-Based PFC QoS and VLAN-Based PFC QoS 42-12Flowchart of PFC QoS Egress LAN Port Features Egress CoS Values42-13 Egress ToS Byte Egress Dscp Mutation with a PFC3Egress PFC QoS Interfaces Egress ACL Support for Remarked Dscp42-15 Marking on Egress OSM PortsClassification and Marking at Untrusted Ingress Ports Understanding Classification and MarkingIngress Classification and Marking at Trusted Ports 42-16Ingress Classification and Marking at Trust CoS LAN Ports Classification and Marking at Ingress OSM PortsIngress Classification and Marking at Trust Dscp Ports 42-1742-18 Classification and Marking on the Msfc PolicersOverview of Policers These sections describe policers42-20 Aggregate Policers42-21 Microflow PolicersUnderstanding Port-Based Queue Types Ingress and Egress Buffers and Layer 2 CoS-Based Queues42-22 42-23 42-24 Ingress Queue Types42-25 Egress Queue TypesModule to Queue Type Mappings Ingress Egress Queue Drop42-26 42-27 42-28 Following global PFC QoS settings apply PFC QoS Global SettingsFeature Default Value = CoS Egress CoS set from final internal Dscp valuesReceive-Queue Limits Default Values With PFC QoS EnabledTransmit-Queue Limit s 42-30Default Drop-Threshold Percentages and CoS Value Mappings Bandwidth Allocation Ratios42-31 1q2t Receive Queues 1q4t Receive Queues42-32 1p1q4t Receive Queues 1p1q0t Receive Queues42-33 42-34 1p1q8t Receive Queues42-35 1q8t Receive Queues42-36 2q8t Receive QueuesStandard receive queue Threshold CoS Lowest priority 8q4t Receive Queues11, 13, 15-17, 19, 21, 23 27, 29, 31, 33, 39, 41-4542-38 42-39 48-6342-40 8q8t Receive Queues 2q2t Transmit Queues42-41 42-42 1p2q2t Transmit Queues42-43 1p3q8t Transmit Queues42-44 1p7q4t Transmit Queues42-45 42-46 48-63Tail-drop 100% nonconfigurable 1p7q8t Transmit Queues42-47 42-48 1p3q1t Transmit QueuesDefault Values With PFC QoS Disabled 1p2q1t Transmit Queues42-49 42-50 General GuidelinesPFC3 Guidelines Wrr-queue bandwidth except Gigabit Ethernet LAN ports42-51 42-52 PFC2 GuidelinesPolicy Map Command Restrictions Class Map Command RestrictionsPolicy Map Class Command Restrictions Supported Granularity for CIR and PIR Rate Values42-54 Supported Granularity for CIR and PIR Token Bucket Sizes42-55 IP Precedence and Dscp ValuesCommand Purpose Enabling PFC QoS Globally42-56 Disables ignore port trust globally on the router Enables ignore port trust globally on the routerDefault Enabling Ignore Port TrustConfiguring Dscp Transparency Enabling Queueing-Only Mode42-58 42-59 Enabling Microflow Policing of Bridged Traffic42-60 Enabling VLAN-Based PFC QoS on Layer 2 LAN PortsEnabling Egress ACL Support for Remarked Dscp Creating Named Aggregate Policers42-61 42-62 42-63 Configuring a PFC QoS Policy These sections describe PFC QoS policy configuration42-64 Protocol Numbered ACLs Extended ACLs Named ACLs PFC QoS Policy Configuration OverviewIPv4 Yes 100 to 1300 to 2000 to IPv6 Yes named Yes 800 to Yes 900 to Supported only with PFC2 MAC LayerConfiguring MAC ACLs Configuring Protocol-Independent MAC ACL Filtering42-66 42-67 Enabling VLAN-Based MAC QoS Filtering42-68 Configuring MAC ACLs42-69 Configuring ARP ACLs for QoS FilteringConfiguring a Class Map Creating a Class Map42-70 Optional Configures the class map to filter using an ACL Configuring Filtering in a Class MapClears the ACL configuration from the class map Class Map Filtering Guidelines and Restrictions42-72 Verifying Class Map ConfigurationPolicy Map Class Configuration Guidelines and Restrictions Configuring a Policy MapCreating a Policy Map To create a policy map, perform this taskCreating a Policy Map Class and Configuring Filtering Configuring Policy Map Class Actions42-74 Configuring Policy Map Class Marking Configuring the Policy Map Class Trust State42-75 Using a Named Aggregate Policer Configuring Policy Map Class PolicingConfiguring a Per-Interface Policer 42-7642-77 42-78 To verify policy map configuration, perform this task Verifying Policy Map ConfigurationExits policy map class configuration mode Additional classes in the policy mapTo attach a policy map to an interface, perform this task Attaching a Policy Map to an InterfaceAttaches a policy map to the interface Removes the policy map from the interfaceRouter# show policy-map interface fastethernet 5/36 42-81Configuring Named Dscp Mutation Maps Configuring Egress Dscp Mutation on a PFC3To configure a named Dscp mutation map, perform this task 42-82Attaches an egress Dscp mutation map to the interface Attaching an Egress Dscp Mutation Map to an InterfaceRemoves the egress Dscp mutation map from 42-8342-84 42-85 Configuring Ingress CoS Mutation MapsConfiguring Dscp Value Maps Mapping Received CoS Values to Internal Dscp Values42-86 Configuring Dscp Markdown Values Configures a Dscp markdown map42-87 42-88 Configures the internal Dscp to egress CoS map Mapping Internal Dscp Values to Egress CoS Values42-89 Configures the trust state of the port Configuring the Trust State of Ethernet LAN and OSM PortsReverts to the default trust state untrusted 42-9042-91 Configuring the Ingress LAN Port CoS ValueConfigures the ingress LAN port CoS value Configuring Standard-Queue Drop Threshold PercentagesReverts to the default port CoS value 42-9242-93 Configuring a Tail-Drop Receive QueueConfiguring a WRED-Drop Transmit Queue Configuring a WRED-Drop and Tail-Drop Receive Queue42-94 42-95 Configuring a WRED-Drop and Tail-Drop Transmit Queue42-96 Configuring 1q4t/2q2t Tail-Drop Threshold PercentagesReverts to the default receive- and transmit-queue Configures the receive- and transmit-queue tail-dropTail-drop thresholds 42-97Configuring DSCP-Based Queue Mapping Mapping QoS Labels to Queues and Drop Thresholds42-98 Configuring the Port to Trust Dscp Configuring Ingress DSCP-Based Queue MappingEnabling DSCP-Based Queue Mapping 42-99Mapping Dscp Values to Standard Receive-Queue Thresholds Reverts to the default mappingMaps Dscp values to the standard receive queue 42-10042-101 Queueing interface commandMapping Dscp Values to Standard Transmit-Queue Thresholds Maps Dscp values to a standard transmit-queue42-102 42-103 Mapping Dscp Values to the Transmit Strict-Priority QueueMapping CoS Values to Standard Receive-Queue Thresholds Configuring CoS-Based Queue MappingMaps CoS values to the standard receive queue 42-104Mapping CoS Values to Standard Transmit-Queue Thresholds Maps CoS values to a standard transmit-queue threshold42-105 Mapping CoS Values to Strict-Priority Queues Maps CoS values to the receive and transmit42-106 42-107 Maps CoS values to a tail-drop threshold42-108 Allocating Bandwidth Between Standard Transmit Queues42-109 Reverts to the default size ratio Setting the Receive-Queue Size RatioSets the size ratio between the receive queues 42-110Configures the queue size ratio between transmit queues Configuring the Transmit-Queue Size RatioConfigures the strict priority queue size 42-111Distribution and Core Interswitch Links Access LayerSample Network Design Overview 42-11242-113 Identify the Voice Traffic from an IP Phone Vvlan Identify the Voice Signaling Traffic from an IP Phone VvlanIdentify the SAP Traffic from the PC Dvlan 42-114Set dscp ef 42-11542-116 Accepting the Traffic Priority Value on Interswitch Links42-117 Prioritizing Traffic on Interswitch Links42-118 Traffic Type Voice Strict Priority Voice signaling Queue 2, ThresholdCoS from DSCP-to-CoS map Output Queue 42-119Using Policers to Limit the Amount of Traffic from a PC Class map commands42-120 42-121 To monitor the policing operation, use these commands42-122 PFC QoS Glossary42-123 42-124