NETGEAR GS748TS-100NAS Regulating Traffic Rates using Quality of Service Settings, Port-based QoS

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GS748T Software User Manual

Regulating Traffic Rates using Quality of Service Settings

Quality of Service (QoS) is used to manage traffic in a network by treating different types of traffic with different levels of priority. Higher priority traffic receives preferential treatment during times of switch congestion.

Three implementations of QoS are supported:

Port-based QoS

IEEE 802.1p-based QoS

DSCP-based QoS

Port-based QoS

Port-based QoS can be achieved by configuring the Default Priority of a port, as described in “Port Configuration” on page 4-2.

IEEE 802.1p-based QoS

IEEE 802.1p-based QoS enables the user to map each of the eight priority levels specified in IEEE 802.1p (p0 to p7) to one of four hardware priority queues: High, Normal, Low, and Lowest. The eight priority levels specified in IEEE 802.1p (p0 to p7) are implemented by a three-bit priority field in the VLAN tag. The switch empties the four hardware priority queues in order, from High to Lowest. Packets are transferred to empty the buffers of each higher hardware priority queue in turn before the next lower hardware priority queue can begin to transfer its received packets through the switch.

The table in the Quality of Service page below shows an example of IEEE 802.1p-based priority settings that you can set for a switch.

Figure 4-9

Configuring the Switch

4-5

v2.0, April 2007

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Contents NETGEAR, Inc Bestätigung des Herstellers/Importeurs TrademarksStatement of Conditions Certificate of the Manufacturer/ImporterEurope EU Declaration of Conformity Regulatory Compliance InformationFCC Information to User FCC Requirements for Operation in the United StatesGS748T Smart Switch Product and Publication Details Contents Appendix a Specifications and Default Values Appendix C Network Cabling V2.0, April How to Use This Book About This ManualWho Should Use this Book Bold Conventions, Formats and ScopeHtml Manual Navigation How to Print this ManualDocument Date Version Description Part Number Revision HistorySwitch Management Interface Chapter Switch Management OverviewSystem Requirements Switch Management MethodsNetwork with Dhcp server Getting Started-Smart Wizard DiscoveryNetwork without Dhcp Server Manually Assigning Network Parameters V2.0, April Web Access Password ChangeAdditional Utilities Firmware Upgrade Exit V2.0, April Starting Web Management Chapter Basic Web ManagementNetgear Home Page and Switch Status V2.0, April Description of Switch Status Parameters V2.0, April System Functions Firmware Menu Managing System Files-Backup and RestoreFactory Reset To restore saved settingsTo back up files Logout Resetting the SystemV2.0, April Using the Switch Configuration Utility Chapter Configuring the SwitchPort Configuration Viewing Packet Statistics V2.0, April Regulating Traffic Rates using Quality of Service Settings Port-based QoSIeee 802.1p-based QoS Differentiated Services Code Point DSCP-based QoS Vlan Adding and Configuring Ieee 802.1Q Vlan Groups Reconfiguring an Ieee 802.1Q Vlan Group Reconfiguring a Port-based Vlan Adding and Configuring Port-based VLANsSelecting a Management Vlan Creating Port Trunks to Increase Link BandwidthSetting up Port Trunks Removing Port Trunks Using a Sniffer Port to Monitor TrafficControlling Per-port Packet Throughput Jumbo Frame SupportStorm Control Dropping Traffic that is Flooding a Port Using Spanning Tree Protocol to Prevent Path LoopsV2.0, April V2.0, April Enabling Switch Management using Snmp To Add a MAC Address Controlling Switch Access by MAC Address and Vlan IDUsing Igmp Snooping to Route Packets Based on Content Filtering Unknown Multicast PacketsTo Remove a MAC Address from the Table Setting Up Static Multicast Groups V2.0, April GS748T Smart Switch Specifications Appendix a Specifications and Default ValuesTable A-3. Port Characteristics GS748T Smart Switch Features and DefaultsTable A-8. Other Features Smart Wizard Enabled Statistics Per port Appendix B Virtual Local Area Networks VLANs Example Ieee 802.1Q VLANsPort-based VLANs Port-based Vlan Example ConfigurationResults of this Configuration Appendix C Network Cabling Fast Ethernet Cable GuidelinesCategory 5 Cable Twisted Pair Cables Category 5 Cable SpecificationsFigure C-1Straight-Through Twisted-Pair Cable Patch Panels and CablesCabling Using 1000BASE-T Gigabit Ethernet over Category 5 CableNear End Cross Talk Next LengthReturn Loss Patch Cables RJ-45 Plug and RJ-45 ConnectorsConclusion V2.0, April