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Moxa Technologies Moxa EtherDevice Switch, EDS-510A user manual What is STP?

Models: EDS-510A Moxa EtherDevice Switch

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	EDS-510A Series User’s Manual		Featured Functions

	NOTE	The STP protocol is part of the IEEE Std 802.1D, 1998 Edition bridge specification. The
		following explanation uses bridge instead of switch.

What is STP?

STP (802.1D) is a bridge-based system that is used to implement parallel paths for network traffic. STP uses a loop-detection process to:

yLocate and then disable less efficient paths (i.e., paths that have a lower bandwidth).

yEnable one of the less efficient paths if the most efficient path fails.

The figure below shows a network made up of three LANs separated by three bridges. Each segment uses at most two paths to communicate with the other segments. Since this configuration can give rise to loops, the network will overload if STP is NOT enabled.

Bridge A

LAN 1

Bridge B

LAN 2

Bridge C

LAN 3

If STP is enabled, it will detect duplicate paths and prevent, or block, one of them from forwarding traffic. In the following example, STP determined that traffic from LAN segment 2 to LAN segment 1 should flow through Bridges C and A because this path has a greater bandwidth and is therefore more efficient.

Bridge A

LAN 1

Bridge B

LAN 2

Bridge C

LAN 3

3-25

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Moxa Technologies Moxa EtherDevice Switch, EDS-510A What is STP?, Following explanation uses bridge instead of switch

Contents

Moxa EtherDevice Switch EDS-510A Series User’s Manual First Edition, OctoberTrademarks Copyright NoticeDisclaimer 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-510A Series User’s Manual Key Function Configuration using a Telnet Console Configuration using a Web Browser EDS-510A Series User’s Manual Disabling Telnet and Browser Access Featured Functions Configuring Basic Settings System IdentificationPassword PasswordAccount Accessible IP Any host on a specific subnetwork can access the EDS-510AAny host can access the EDS-510A Allowable Hosts Input formatEnable PortDescription NameSpeed NetworkFDX Flow Ctrl Auto IP Configuration Switch IP AddressSwitch Subnet Mask Default GatewayTime Current TimeCurrent Date System Up TimeTurbo Ring DIP Switch Time zone before setting the timeTime Server IP/Name Time Server Query PeriodDIP Switch Hardware Configuration DIP Switch Turbo Ring DIP DescriptionSystem File Update-By Remote Tftp Configuration Files Path and NameTftp Server IP/Name Firmware Files Path and NameSystem File Update-By Local Import/Export System File Update-By Backup MediaFactory Default Using Port TrunkingRestart Port Trunking Concept Trunk Group Maximum of 3 trunk groups Configuring Port TrunkingTrunk Type Configuring Snmp Setting DescriptionAvailable Ports/Member Port Trunk TableV1, V2c Read Community Snmp VersionsV1, V2c Write/Read Community Trap Settings 1st Trap Server IP/NamePrivate MIB information Using Communication RedundancyGigabit Ethernet Redundant Ring Capability 300 ms Initial Setup Turbo Ring ConceptWhen the number of EDS-510A units in the Turbo Ring is even Ring Coupling Configuring Turbo Ring STP/RSTP Concept What is STP? Following explanation uses bridge instead of switchHow STP Works STP RequirementsPort Speed Path Cost 802.1D Edition 802.1w-2001 STP CalculationSTP Configuration STP ReconfigurationDifferences between Rstp and STP STP ExampleUsing STP on a Network with Multiple VLANs Configuring STP/RSTP Root/Not RootForwarding Delay Enable STP per PortProtocol of Redundancy Bridge priorityConfiguration Limits of RSTP/STP Port PriorityPort Cost Port StatusUsing Traffic Prioritization What is Traffic Prioritization?Traffic Prioritization Concept How Traffic Prioritization WorksIeee 802.1p Priority Level Ieee 802.1D Traffic Type Differentiated Services DiffServ Traffic MarkingTraffic Prioritization QoS Classification Configuring Traffic PrioritizationTraffic Queues Queuing Mechanism Port Highest PriorityInspect TOS Inspect COSCoS Mapping Setting Description FactoryTOS/DiffServ Mapping Using Virtual LAN What is a VLAN?Virtual LAN Vlan Concept Benefits of VLANsVLANs and Moxa EtherDevice Switch Managing a VlanCommunication Between VLANs VLANs Tagged and Untagged MembershipSample Applications of VLANs using Moxa EDS-510A DeviceConfiguring Virtual LAN Vlan SettingsVlan Mode Management Vlan IDPort Type Port PvidVlan Table PortUsing Multicast Filtering What is an IP Multicast?Concept of Multicast Filtering Benefits of MulticastIgmp Internet Group Management Protocol Snooping Mode Multicast Filtering and Moxa EtherDevice SwitchNetwork without multicast filtering Query Mode Igmp Multicast FilteringGmrp Garp Multicast Registration Protocol Static Multicast MACConfiguring Igmp Snooping Igmp Snooping SettingsAdd Static Multicast MAC Using Bandwidth Management Configuring GmrpGmrp enable Gmrp TableUsing Port Access Control Traffic Rate Limiting SettingsStatic Port Lock IeeeMessage Exchange Configuring Static Port Lock Configuring IeeeDatabase Option Radius ServerServer Port Shared Key802.1X Re-Authentication Local User Database Setup802.1X Re-Authentication Local User Database SetupConfiguring Email Warning Using Auto WarningPort Access Control Table System Events Event TypePort Events Email Setup Password SettingMail Server IP/Name Account NameConfiguring Relay Warning Event SetupEmail Address Send Test EmailSystem Events Using Line-Swap-Fast-Recovery Using Set Device IPConfiguring Line-Swap Fast Recovery Override relay alarm settingsConfiguring Set Device IP Set up the connected devicesUsing Diagnosis Mirror PortOutput data stream Bi-directionalMonitor by Switch Using MonitorPing Using the MAC Address Table Monitor by PortUsing Event Log MACUsing HTTPS/SSL Using SyslogSyslog Settings EDS-510A Series User’s Manual Featured Functions EDS Configurator GUI Starting EDS Configurator Broadcast SearchSearch by IP address Upgrade Firmware Modify IP AddressExport Configuration Import Configuration Unlock Server LockedUnlocked BlankLocked Fixed FixedUnlocked Fixed MIB Groups MIB II.11 Snmp Group MIB II.10 Transmission GroupMIB II.17 dot1dBridge Group Public Traps Private TrapsTechnology SpecificationsInterface Environmental MechanicalRegulatory Approvals Service Information Moxa Internet Services Following services are providedProblem Report Form Serial NumberProduct Return Procedure