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A P T E R
Overview
Port Types Supported by PFC QoS
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PFC QoS Feature Processing Overview
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2shows traffic flow and PFC QoS features with a PFC3
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3shows traffic flow and PFC QoS features with a PFC2
Component Overview
Ingress LAN Port PFC QoS Features
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Flowchart of Ingress LAN Port PFC QoS Features
These sections describe PFCs and DFCs as they relate to QoS
PFC and DFC QoS Features
Port Trust
Ingress Congestion Avoidance
Supported Distributed Forwarding Cards
Supported Policy Feature Cards
PFC and DFC QoS Feature List and Flowchart
Feature
Ingress PFC QoS
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Internal Dscp Values
Initial Internal Dscp Value
Final Internal Dscp Value
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PFC QoS Egress Port Features
These sections describe PFC QoS egress port features
Port-Based PFC QoS and VLAN-Based PFC QoS
Egress CoS Values
Flowchart of PFC QoS Egress LAN Port Features
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Egress ACL Support for Remarked Dscp
Egress Dscp Mutation with a PFC3
Egress ToS Byte
Egress PFC QoS Interfaces
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Marking on Egress OSM Ports
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Understanding Classification and Marking
Classification and Marking at Untrusted Ingress Ports
Ingress Classification and Marking at Trusted Ports
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Classification and Marking at Ingress OSM Ports
Ingress Classification and Marking at Trust CoS LAN Ports
Ingress Classification and Marking at Trust Dscp Ports
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These sections describe policers
Policers
Classification and Marking on the Msfc
Overview of Policers
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Aggregate Policers
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Microflow Policers
Ingress and Egress Buffers and Layer 2 CoS-Based Queues
Understanding Port-Based Queue Types
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Ingress Queue Types
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Egress Queue Types
Ingress Egress Queue Drop
Module to Queue Type Mappings
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= CoS Egress CoS set from final internal Dscp values
PFC QoS Global Settings
Following global PFC QoS settings apply
Feature Default Value
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Default Values With PFC QoS Enabled
Receive-Queue Limits
Transmit-Queue Limit s
Bandwidth Allocation Ratios
Default Drop-Threshold Percentages and CoS Value Mappings
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1q4t Receive Queues
1q2t Receive Queues
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1p1q0t Receive Queues
1p1q4t Receive Queues
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1p1q8t Receive Queues
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1q8t Receive Queues
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2q8t Receive Queues
27, 29, 31, 33, 39, 41-45
8q4t Receive Queues
Standard receive queue Threshold CoS Lowest priority
11, 13, 15-17, 19, 21, 23
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2q2t Transmit Queues
8q8t Receive Queues
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1p2q2t Transmit Queues
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1p3q8t Transmit Queues
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1p7q4t Transmit Queues
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1p7q8t Transmit Queues
Tail-drop 100% nonconfigurable
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1p3q1t Transmit Queues
1p2q1t Transmit Queues
Default Values With PFC QoS Disabled
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General Guidelines
Wrr-queue bandwidth except Gigabit Ethernet LAN ports
PFC3 Guidelines
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PFC2 Guidelines
Supported Granularity for CIR and PIR Rate Values
Class Map Command Restrictions
Policy Map Command Restrictions
Policy Map Class Command Restrictions
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Supported Granularity for CIR and PIR Token Bucket Sizes
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IP Precedence and Dscp Values
Enabling PFC QoS Globally
Command Purpose
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Enabling Ignore Port Trust
Enables ignore port trust globally on the router
Disables ignore port trust globally on the router
Default
Enabling Queueing-Only Mode
Configuring Dscp Transparency
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Enabling Microflow Policing of Bridged Traffic
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Enabling VLAN-Based PFC QoS on Layer 2 LAN Ports
Creating Named Aggregate Policers
Enabling Egress ACL Support for Remarked Dscp
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These sections describe PFC QoS policy configuration
Configuring a PFC QoS Policy
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Yes 800 to Yes 900 to Supported only with PFC2 MAC Layer
PFC QoS Policy Configuration Overview
Protocol Numbered ACLs Extended ACLs Named ACLs
IPv4 Yes 100 to 1300 to 2000 to IPv6 Yes named
Configuring Protocol-Independent MAC ACL Filtering
Configuring MAC ACLs
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Enabling VLAN-Based MAC QoS Filtering
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Configuring MAC ACLs
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Configuring ARP ACLs for QoS Filtering
Creating a Class Map
Configuring a Class Map
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Class Map Filtering Guidelines and Restrictions
Configuring Filtering in a Class Map
Optional Configures the class map to filter using an ACL
Clears the ACL configuration from the class map
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Verifying Class Map Configuration
To create a policy map, perform this task
Configuring a Policy Map
Policy Map Class Configuration Guidelines and Restrictions
Creating a Policy Map
Configuring Policy Map Class Actions
Creating a Policy Map Class and Configuring Filtering
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Configuring the Policy Map Class Trust State
Configuring Policy Map Class Marking
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Configuring Policy Map Class Policing
Using a Named Aggregate Policer
Configuring a Per-Interface Policer
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Additional classes in the policy map
Verifying Policy Map Configuration
To verify policy map configuration, perform this task
Exits policy map class configuration mode
Removes the policy map from the interface
Attaching a Policy Map to an Interface
To attach a policy map to an interface, perform this task
Attaches a policy map to the interface
Router# show policy-map interface fastethernet 5/36
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Configuring Egress Dscp Mutation on a PFC3
Configuring Named Dscp Mutation Maps
To configure a named Dscp mutation map, perform this task
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Attaching an Egress Dscp Mutation Map to an Interface
Attaches an egress Dscp mutation map to the interface
Removes the egress Dscp mutation map from
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Configuring Ingress CoS Mutation Maps
Mapping Received CoS Values to Internal Dscp Values
Configuring Dscp Value Maps
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Configures a Dscp markdown map
Configuring Dscp Markdown Values
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Mapping Internal Dscp Values to Egress CoS Values
Configures the internal Dscp to egress CoS map
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Configuring the Trust State of Ethernet LAN and OSM Ports
Configures the trust state of the port
Reverts to the default trust state untrusted
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Configuring the Ingress LAN Port CoS Value
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Configuring Standard-Queue Drop Threshold Percentages
Configures the ingress LAN port CoS value
Reverts to the default port CoS value
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Configuring a Tail-Drop Receive Queue
Configuring a WRED-Drop and Tail-Drop Receive Queue
Configuring a WRED-Drop Transmit Queue
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Configuring a WRED-Drop and Tail-Drop Transmit Queue
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Configuring 1q4t/2q2t Tail-Drop Threshold Percentages
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Configures the receive- and transmit-queue tail-drop
Reverts to the default receive- and transmit-queue
Tail-drop thresholds
Mapping QoS Labels to Queues and Drop Thresholds
Configuring DSCP-Based Queue Mapping
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Configuring Ingress DSCP-Based Queue Mapping
Configuring the Port to Trust Dscp
Enabling DSCP-Based Queue Mapping
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Reverts to the default mapping
Mapping Dscp Values to Standard Receive-Queue Thresholds
Maps Dscp values to the standard receive queue
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Queueing interface command
Maps Dscp values to a standard transmit-queue
Mapping Dscp Values to Standard Transmit-Queue Thresholds
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Mapping Dscp Values to the Transmit Strict-Priority Queue
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Configuring CoS-Based Queue Mapping
Mapping CoS Values to Standard Receive-Queue Thresholds
Maps CoS values to the standard receive queue
Maps CoS values to a standard transmit-queue threshold
Mapping CoS Values to Standard Transmit-Queue Thresholds
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Maps CoS values to the receive and transmit
Mapping CoS Values to Strict-Priority Queues
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Maps CoS values to a tail-drop threshold
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Allocating Bandwidth Between Standard Transmit Queues
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Setting the Receive-Queue Size Ratio
Reverts to the default size ratio
Sets the size ratio between the receive queues
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Configuring the Transmit-Queue Size Ratio
Configures the queue size ratio between transmit queues
Configures the strict priority queue size
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Access Layer
Distribution and Core Interswitch Links
Sample Network Design Overview
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Identify the Voice Signaling Traffic from an IP Phone Vvlan
Identify the Voice Traffic from an IP Phone Vvlan
Identify the SAP Traffic from the PC Dvlan
Set dscp ef
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Accepting the Traffic Priority Value on Interswitch Links
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Prioritizing Traffic on Interswitch Links
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Voice Strict Priority Voice signaling Queue 2, Threshold
Traffic Type
CoS from DSCP-to-CoS map Output Queue
Class map commands
Using Policers to Limit the Amount of Traffic from a PC
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To monitor the policing operation, use these commands
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PFC QoS Glossary
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