Linksys SLM248P, SLM248G, SLM224P, SLM2024, SLM2048, SLM224G manual QoS CoS Settings, CoS Default

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Chapter 4

Configuration Using the Web-based Utility

QoS

Network traffic is usually unpredictable, and the only basic assurance that can be offered is best effort traffic delivery. To overcome this challenge, Quality of Service (QoS) is applied throughout the network. This ensures that network traffic is prioritized according to specified criteria, and that specific traffic receives preferential treatment. QoS in the network optimizes network performance and entails two basic facilities:

Classifying incoming traffic into handling classes, based on an attribute, including:

•The ingress interface

•Packet content

•A combination of these attributes

Providing various mechanisms for determining the allocation of network resources to different handling classes, including:

•The assignment of network traffic to a particular hardware queue

•The assignment of internal resources

•Traffic shaping

The terms Class of Service (CoS) and QoS are used in the following context:

•CoS provides varying Layer 2 traffic services. CoS refers to classifying traffic into traffic classes, where each class is handled as an aggregate whole, with no per-flow settings. CoS is usually related to the 802.1p service that classifies flows according to their Layer 2 priority, as set in the VLAN header.

•QoS refers to Layer 2 traffic and above. QoS handles per-flow settings, even within a single traffic class.

The QoS facility involves the following elements:

•Traffic Classification—Classifies each incoming packet as belonging to a given traffic class, based on the packet contents and/or the context.

•Assignment to Hardware Queues—Assigns incoming packets to forwarding queues. Packets are sent to a particular queue for handling as a function of the traffic class to which they belong, as defined by the classification mechanism.

•Traffic Class-Handling Attributes—Applies QoS/CoS mechanisms to different classes, including Bandwidth Management.

The QoS configuration options are as follows:

•CoS Settings

•Queue Settings

•DSCP Setting

•Basic Mode

QoS > CoS Settings

The CoS Settings screen contains fields for enabling or disabling CoS. This screen contains two sections, CoS Settings and CoS Default.

QoS > CoS Settings

CoS Settings

QoS Mode  Indicates if QoS is enabled. The possible values are:

•Disable  Disables QoS.

•Basic  Enables QoS. This is the default value.

Class of Service  Specifies the CoS priority tag values, where 0 is the lowest and 7 is the highest.

Queue  Defines the traffic forwarding queue to which the CoS priority is mapped. Four traffic priority queues are supported.

Click Restore Defaults to restore the device factory defaults for mapping CoS values to a forwarding queue.

CoS Default

Interface  The interface to which the CoS configuration applies.

Default CoS  Determines the default CoS value for incoming packets for which a VLAN tag is not defined. The possible field values are 0-7. The default CoS is 0.

LAG  The LAG to which the port belongs, if relevant. If the port is a member of a LAG, the LAG settings override the port settings.

Click Save Settings to save the changes, or Cancel Changes to cancel the changes.

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Contents Business Series Smart Gigabit Ethernet Switch Icon Descriptions About This GuideAbout This Guide Online ResourcesTable of Contents Table of Contents Appendix B Glossary Appendix C Specifications Appendix D Warranty and Regulatory InformationAppendix E Contact Information Chapter Introduction IntroductionSLM2048 Chapter Product OverviewProduct Overview Back PanelSLM2024 SLM248G SLM248P SLM224G SLM224P Pre-Installation Considerations Chapter InstallationInstallation Placement OptionsHardware Installation Desktop PlacementRack-Mount Placement Uplinking the Switch WithChapter Configuration Using Web-based Utility SetupSetup Summary System Information Setup Network SettingsDevice Information IdentificationLocal Time Setup TimeIP Configuration Daylight SavingPort Management Port Settings Port ConfigurationPort Management Port Management Link Aggregation LAG Configuration Global Parameter Port Management PoE Power SettingsPort Management Lacp Port PriorityVlan Management Create Vlan Vlan Management Port SettingsVlan Management Vlan Management Port to VlanPort The number of the port being configured Vlan Management Vlan to PortJoin Vlan to Port Interface StatisticsStatistics Interface Statistics Ethernet-likeSecurity Security 802.1x SettingsSetting Timer ParametersSecurity Port Security IP Address Enter the IP address to be allowed Security IP Access ListSecurity Storm Control Broadcast Only Counts only Broadcast trafficSecurity Radius CoS Default QoS CoS SettingsCoS Settings QoSQoS Queue Settings QoS Dscp SettingsQoS Basic Mode Spanning Tree STP Status Global SettingSpanning Tree Spanning Tree Global STPSpanning Tree STP Port Settings Bridge SettingsSpeed Displays the speed at which the port is operating Multicast Igmp Snooping Vlan Igmp SettingsMulticast Multicast Bridge MulticastMulticast Bridge Multicast Forward All User Authentication AdminAdmin User Authentication Local User EditQuery Admin Static AddressAdmin Dynamic Address Secure The entry is defined for locked portsAdmin Port Mirroring Admin Save ConfigurationAdmin Factory Default Admin Firmware UpgradeAdmin Reboot Click the Reboot button, then click OK to confirmAdmin Logging Admin Memory LogsAdmin Flash Logs Logout If you select Yes, a confirmation screen appearsAppendix a About Gigabit Ethernet Fiber Optic Cabling Gigabit EthernetFiber Optic Cabling Appendix B Glossary GlossaryGlossary Packet a unit of data sent over a network Mail protocol on the InternetAppendix B Appendix C Specifications SpecificationsSLM2024/SLM2048 Buttons Reset Cabling Type UTP CAT 5 or better for Power Internal Power CertificationConnectors for 10BASE-T UL, cUL, CE mark, CB83 lb 3.1 kg Unit Weight39 lb 2.9 kg 28 lb 3.3 kgAppendix D Warranty and Regulatory Information Limited WarrantyIndustry Canada Statement Safety NoticesFCC Statement Règlement d’Industry CanadaDansk Danish Miljøinformation for kunder i EU Appendix D Norsk Norwegian Miljøinformasjon for kunder i EU Appendix D Appendix E Contact Information
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