Moxa Technologies EDS-726 user manual Ieee 802.1p Priority Level Ieee 802.1D Traffic Type

Page 48

EDS-726 Series User’s Manual

Featured Functions

 

 

 

 

 

IEEE 802.1p Priority Level

IEEE 802.1D Traffic Type

 

 

0

Best Effort (default)

 

 

1

Background

 

 

2

Standard (spare)

 

 

3

Excellent Effort (business critical)

 

 

4

Controlled Load (streaming multimedia)

 

 

5

Video (interactive media); less than 100 milliseconds

 

 

 

of latency and jitter

 

 

6

Voice (interactive voice); less than 10 milliseconds of

 

 

 

latency and jitter

 

 

7

Network Control Reserved traffic

 

Even though the IEEE 802.1D standard is the most widely used prioritization scheme in the LAN environment, it still has some restrictions:

yIt requires an additional 4-byte tag in the frame, which is normally optional in Ethernet networks. Without this tag, the scheme cannot work.

yThe tag is part of the IEEE 802.1Q header, so to implement QoS at layer 2, the entire network must implement IEEE 802.1Q VLAN tagging.

It is only supported on a LAN and not across routed WAN links, since the IEEE 802.1Q tags are removed when the packets pass through a router.

Differentiated Services (DiffServ) Traffic Marking

DiffServ is a Layer 3 marking scheme that uses the DiffServ Code Point (DSCP) field in the IP header to store the packet priority information. DSCP is an advanced intelligent method of traffic marking because you can choose how your network prioritizes different types of traffic. DSCP uses 64 values that map to user-defined service levels, allowing you to establish more control over network traffic.

Advantages of DiffServ over IEEE 802.1D are:

yConfigure how you want your switch to treat selected applications and types of traffic by assigning various grades of network service to them.

yNo extra tags are required in the packet.

yDSCP uses the IP header of a packet and therefore priority is preserved across the Internet.

yDSCP is backward compatible with IPV4 TOS, which allows operation with existing devices that use a layer 3 TOS enabled prioritization scheme.

Traffic Prioritization

EDS-726 classifies traffic based on layer 2 of the OSI 7 layer model, and the switch prioritizes received traffic according to the priority information defined in the received packet. Incoming traffic is classified based upon the IEEE 802.1D frame and is assigned to the appropriate priority queue based on the IEEE 802.1p service level value defined in that packet. Service level markings (values) are defined in the IEEE 802.1Q 4-byte tag, and consequently traffic will only contain 802.1p priority markings if the network is configured with VLANs and VLAN tagging. The traffic flow through the switch is as follows:

1.A packet received by the EDS-726 may or may not have an 802.1p tag associated with it. If it does not, then it is given a default 802.1p tag (which is usually 0). Alternatively, the packet may be marked with a new 802.1p value, which will result in all knowledge of the old 802.1p tag being lost.

3-33

Image 48
Contents Moxa EtherDevice Switch EDS-726 Series User’s Manual First Edition, JulyCopyright Notice TrademarksDisclaimer Table of Contents Chapter EDS Configurator GUI Introduction Package Checklist FeaturesOverview Industrial Networking CapabilityUseful Utility and Remote Configuration Recommended Software and AccessoriesGetting Started RS-232 Console Configuration 115200, None, 8, 1, VT100 Connection CautionEDS-726 Series User’s Manual Key Function Configuration by Telnet Console Configuration by Web Browser EDS-726 Series User’s Manual Disabling Telnet and Browser Access Featured Functions Configuring Basic Settings System IdentificationPassword Switch NameSwitch Location Switch DescriptionPassword AccountAccessible IP Any host on a specific subnetwork can access the EDS-726Any host can access the EDS-726 Allowable Hosts Input formatEnable PortDescription NameNetwork Port Transmission SpeedFDX Flow Control Port TypeAuto IP Configuration Switch IP AddressSwitch Subnet Mask Default GatewayTime Current TimeCurrent Date System Up TimeSystem File Update-By Remote Tftp System File Update-By Local Import/Export Using Port Trunking System File Update-By CF CardFactory Default Port Trunking Concept Configuring Port Trunking Setting Description Trunk Group Maximum of 4 trunk groupsTrunk Type Member Ports/Available PortsConfiguring Snmp SnmpSnmp Read/Write Settings Snmp VersionsV1, V2c Read Community V1, V2c Write/Read CommunityTrap Settings Trap Server IP/NameUsing Communication Redundancy Switch Object IDPrivate MIB information Gigabit Ethernet Redundant Ring Capability 300 msInitial Setup Turbo Ring ConceptWhen the number of EDS-726 units in the Turbo Ring is even Ring Coupling Configuring Turbo Ring STP/RSTP Concept What is STP? How STP Works STP RequirementsPort Speed Path Cost 802.1D Edition 802.1w-2001 STP Configuration STP ReconfigurationDifferences between Rstp and STP STP CalculationUsing STP on a Network with Multiple VLANs STP ExampleConfiguring STP/RSTP Forwarding Delay Root/Not RootProtocol of Redundancy Bridge priorityConfiguration Limits of RSTP/STP Enable STP per PortPort Priority Port CostUsing Traffic Prioritization What is Traffic Prioritization?Traffic Prioritization Concept How Traffic Prioritization WorksDifferentiated Services DiffServ Traffic Marking Ieee 802.1p Priority Level Ieee 802.1D Traffic TypeTraffic Prioritization Configuring Traffic Prioritization QoS ClassificationTraffic Queues Default Port Priority Queuing MechanismInspect TOS Inspect COSSetting Description Factory CoS MappingTOS/DiffServ Mapping Using Virtual LAN What is a VLAN?Virtual LAN Vlan Concept VLANs and Moxa EtherDevice Switch Benefits of VLANsManaging a Vlan Communication Between VLANsSample Applications of VLANs using Moxa EDS-726 HUBConfiguring 802.1Q Vlan Vlan Port SettingsManagement Vlan ID Port PvidPort Fixed Vlan List Tagged Port Forbidden Vlan ListUsing Multicast Filtering What is an IP Multicast?Concept of Multicast Filtering Benefits of MulticastMulticast Filtering Network without multicast filteringMulticast Filtering and Moxa EtherDevice Switch Igmp Internet Group Management Protocol Snooping ModeQuery Mode Igmp Multicast FilteringConfiguring Igmp Snooping Igmp Snooping SettingsStatic Multicast MAC Enabling Multicast FilteringIgmp Snooping Static Multicast Router PortQuerier Igmp TableAdd Static Multicast MAC Add New Static Multicast Address to the ListNone Join PortConfiguring Gmrp Port Setting Description Factory DefaultGmrp enable Setting Description Factory Default Port Mode Setting Description Factory DefaultUsing Bandwidth Management Configuring Bandwidth ManagementGmrp Table Broadcast Storm ProtectionUsing Port Access Control Traffic Rate Limiting SettingsIeee Static Port LockMessage Exchange Configuring Ieee 802.1XDatabase Option Radius ServerServer Port Shared Key802.1X Re-Authentication Local User Database Setup802.1X Re-Authentication Local User Database Setup Static Port Lock802.1X Table Using Auto Warning Configuring Email WarningEmail Alarm Events Settings MoxaEtherDeviceSwitch0001@SwitchLocation Event TypesSystem Event Port EventEmail Settings Configuring Relay Warning Relay Alarm Events SettingsConfiguring Relay Event Types Activate your settingsRelay Alarm List Override relay alarm settingsUsing Line-Swap-Fast-Recovery Using Set Device IPConfiguring Line-Swap Fast Recovery Enable Line-Swap-Fast-RecoveryConfiguring Set Device IP Set up the connected devicesUsing Diagnosis Mirror PortOutput data stream Bi-directionalUsing Monitor Monitor by SwitchPing Using the MAC Address Table Monitor by PortUsing Event Log ALLEDS Configurator GUI Starting EDS Configurator Broadcast SearchUpgrade Firmware Search by IP addressModify IP Address Export Configuration Import Configuration Unlock Server EDS-726 Series User’s Manual MIB II.1 System Group MIB II.2 Interfaces GroupMIB II.4 IP Group MIB II.5 Icmp GroupMIB II.10 Transmission Group MIB II.11 Snmp GroupMIB II.17 dot1dBridge Group Public Traps Private TrapsModular Managed Switch System, EDS-72610G InterfacePower Gigabit Ethernet Interface Module, IM seriesMechanical Fast Ethernet Interface Module, IM series Optical FiberInterface Environmental Regulatory ApprovalsService Information Moxa Internet Services Following services are providedProblem Report Form Serial NumberProduct Return Procedure