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Cisco Systems OL-4266-08 PFC QoS Egress Port Features, Port-Based PFC QoS and VLAN-Based PFC QoS

Models: OL-4266-08

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Chapter 42 Configuring PFC QoS

Understanding How PFC QoS Works

Port-Based PFC QoS and VLAN-Based PFC QoS

You can configure each ingress LAN port for either physical port-based PFC QoS (default) or

VLAN-based PFC QoS and attach a policy map to the selected interface.

On ports configured for port-based PFC QoS, you can attach a policy map to the ingress LAN port as follows:

•On a nontrunk ingress LAN port configured for port-based PFC QoS, all traffic received through the port is subject to the policy map attached to the port.

•On a trunking ingress LAN port configured for port-based PFC QoS, traffic in all VLANs received through the port is subject to the policy map attached to the port.

On a nontrunk ingress LAN port configured for VLAN-based PFC QoS, traffic received through the port is subject to the policy map attached to the port’s VLAN.

On a trunking ingress LAN port configured for VLAN-based PFC QoS, traffic received through the port is subject to the policy map attached to the traffic’s VLAN.

PFC QoS Egress Port Features

These sections describe PFC QoS egress port features:

•Flowchart of PFC QoS Egress LAN Port Features, page 42-13

•Egress CoS Values, page 42-13

•Egress DSCP Mutation with a PFC3, page 42-14

•Egress ToS Byte, page 42-14

•Egress PFC QoS Interfaces, page 42-14

•Egress ACL Support for Remarked DSCP, page 42-14

•Marking on Egress OSM Ports, page 42-15

	Cisco 7600 Series Router Cisco IOS Software Configuration Guide, Release 12.2SX
42-12	OL-4266-08

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Cisco Systems OL-4266-08 manual PFC QoS Egress Port Features, Port-Based PFC QoS and VLAN-Based PFC QoS, 42-12

Contents

A P T E R 42-1Port Types Supported by PFC QoS Overview42-2 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 42-5Ingress LAN Port PFC QoS Features Component Overview42-6 Flowchart of Ingress LAN Port PFC QoS Features 42-7PFC and DFC QoS Features Port TrustIngress Congestion Avoidance These sections describe PFCs and DFCs as they relate to QoSSupported Policy Feature Cards PFC and DFC QoS Feature List and FlowchartFeature Supported Distributed Forwarding Cards42-10 Ingress PFC QoSInternal Dscp Values Initial Internal Dscp ValueFinal Internal Dscp Value 42-11PFC QoS Egress Port Features These sections describe 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 Dscp Mutation with a PFC3 Egress ToS ByteEgress PFC QoS Interfaces Egress ACL Support for Remarked DscpMarking on Egress OSM Ports 42-15Understanding Classification and Marking Classification and Marking at Untrusted Ingress PortsIngress Classification and Marking at Trusted Ports 42-16Classification and Marking at Ingress OSM Ports Ingress Classification and Marking at Trust CoS LAN PortsIngress Classification and Marking at Trust Dscp Ports 42-1742-18 Policers Classification and Marking on the MsfcOverview of Policers These sections describe policersAggregate Policers 42-20Microflow Policers 42-21Understanding Port-Based Queue Types Ingress and Egress Buffers and Layer 2 CoS-Based Queues42-22 42-23 Ingress Queue Types 42-24Egress Queue Types 42-25Module to Queue Type Mappings Ingress Egress Queue Drop42-26 42-27 42-28 PFC QoS Global Settings Following global PFC QoS settings applyFeature Default Value = CoS Egress CoS set from final internal Dscp valuesDefault Values With PFC QoS Enabled Receive-Queue LimitsTransmit-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 1p1q8t Receive Queues 42-341q8t Receive Queues 42-352q8t Receive Queues 42-368q4t Receive Queues Standard receive queue Threshold CoS Lowest priority11, 13, 15-17, 19, 21, 23 27, 29, 31, 33, 39, 41-4542-38 48-63 42-3942-40 8q8t Receive Queues 2q2t Transmit Queues42-41 1p2q2t Transmit Queues 42-421p3q8t Transmit Queues 42-431p7q4t Transmit Queues 42-4442-45 48-63 42-46Tail-drop 100% nonconfigurable 1p7q8t Transmit Queues42-47 1p3q1t Transmit Queues 42-48Default Values With PFC QoS Disabled 1p2q1t Transmit Queues42-49 General Guidelines 42-50PFC3 Guidelines Wrr-queue bandwidth except Gigabit Ethernet LAN ports42-51 PFC2 Guidelines 42-52Class Map Command Restrictions Policy Map Command RestrictionsPolicy Map Class Command Restrictions Supported Granularity for CIR and PIR Rate ValuesSupported Granularity for CIR and PIR Token Bucket Sizes 42-54IP Precedence and Dscp Values 42-55Command Purpose Enabling PFC QoS Globally42-56 Enables ignore port trust globally on the router Disables ignore port trust globally on the routerDefault Enabling Ignore Port TrustConfiguring Dscp Transparency Enabling Queueing-Only Mode42-58 Enabling Microflow Policing of Bridged Traffic 42-59Enabling VLAN-Based PFC QoS on Layer 2 LAN Ports 42-60Enabling 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 PFC QoS Policy Configuration Overview Protocol Numbered ACLs Extended ACLs Named ACLsIPv4 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 Enabling VLAN-Based MAC QoS Filtering 42-67Configuring MAC ACLs 42-68Configuring ARP ACLs for QoS Filtering 42-69Configuring a Class Map Creating a Class Map42-70 Configuring Filtering in a Class Map Optional Configures the class map to filter using an ACLClears the ACL configuration from the class map Class Map Filtering Guidelines and RestrictionsVerifying Class Map Configuration 42-72Configuring a Policy Map Policy Map Class Configuration Guidelines and RestrictionsCreating 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 Configuring Policy Map Class Policing Using a Named Aggregate PolicerConfiguring a Per-Interface Policer 42-7642-77 42-78 Verifying Policy Map Configuration To verify policy map configuration, perform this taskExits policy map class configuration mode Additional classes in the policy mapAttaching a Policy Map to an Interface To attach a policy map to an interface, perform this taskAttaches a policy map to the interface Removes the policy map from the interface42-81 Router# show policy-map interface fastethernet 5/36Configuring Egress Dscp Mutation on a PFC3 Configuring Named Dscp Mutation MapsTo configure a named Dscp mutation map, perform this task 42-82Attaching an Egress Dscp Mutation Map to an Interface Attaches an egress Dscp mutation map to the interfaceRemoves the egress Dscp mutation map from 42-8342-84 Configuring Ingress CoS Mutation Maps 42-85Configuring 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 Configuring the Trust State of Ethernet LAN and OSM Ports Configures the trust state of the portReverts to the default trust state untrusted 42-90Configuring the Ingress LAN Port CoS Value 42-91Configuring Standard-Queue Drop Threshold Percentages Configures the ingress LAN port CoS valueReverts to the default port CoS value 42-92Configuring a Tail-Drop Receive Queue 42-93Configuring a WRED-Drop Transmit Queue Configuring a WRED-Drop and Tail-Drop Receive Queue42-94 Configuring a WRED-Drop and Tail-Drop Transmit Queue 42-95Configuring 1q4t/2q2t Tail-Drop Threshold Percentages 42-96Configures the receive- and transmit-queue tail-drop Reverts to the default receive- and transmit-queueTail-drop thresholds 42-97Configuring DSCP-Based Queue Mapping Mapping QoS Labels to Queues and Drop Thresholds42-98 Configuring Ingress DSCP-Based Queue Mapping Configuring the Port to Trust DscpEnabling DSCP-Based Queue Mapping 42-99Reverts to the default mapping Mapping Dscp Values to Standard Receive-Queue ThresholdsMaps Dscp values to the standard receive queue 42-100Queueing interface command 42-101Mapping Dscp Values to Standard Transmit-Queue Thresholds Maps Dscp values to a standard transmit-queue42-102 Mapping Dscp Values to the Transmit Strict-Priority Queue 42-103Configuring CoS-Based Queue Mapping Mapping CoS Values to Standard Receive-Queue ThresholdsMaps 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 Maps CoS values to a tail-drop threshold 42-107Allocating Bandwidth Between Standard Transmit Queues 42-10842-109 Setting the Receive-Queue Size Ratio Reverts to the default size ratioSets the size ratio between the receive queues 42-110Configuring the Transmit-Queue Size Ratio Configures the queue size ratio between transmit queuesConfigures the strict priority queue size 42-111Access Layer Distribution and Core Interswitch LinksSample Network Design Overview 42-11242-113 Identify the Voice Signaling Traffic from an IP Phone Vvlan Identify the Voice Traffic from an IP Phone VvlanIdentify the SAP Traffic from the PC Dvlan 42-11442-115 Set dscp efAccepting the Traffic Priority Value on Interswitch Links 42-116Prioritizing Traffic on Interswitch Links 42-11742-118 Voice Strict Priority Voice signaling Queue 2, Threshold Traffic TypeCoS from DSCP-to-CoS map Output Queue 42-119Using Policers to Limit the Amount of Traffic from a PC Class map commands42-120 To monitor the policing operation, use these commands 42-121PFC QoS Glossary 42-12242-123 42-124