What is STP? | Moxa Technologies EDS-726 manual

EDS-726 Series User’s Manual

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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

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Moxa Technologies EDS-726 user manual What is STP?

Contents

Moxa EtherDevice Switch EDS-726 Series User’s Manual First Edition, July Trademarks Copyright NoticeDisclaimer Table of Contents Chapter EDS Configurator GUI Introduction Package Checklist FeaturesOverview Industrial Networking Capability Useful Utility and Remote Configuration Recommended Software and Accessories Getting Started RS-232 Console Configuration 115200, None, 8, 1, VT100 Connection Caution EDS-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 Identification Password Switch NameSwitch Location Switch Description Password Account Accessible IP Any host on a specific subnetwork can access the EDS-726Any host can access the EDS-726 Allowable Hosts Input format Enable PortDescription Name Network Port Transmission SpeedFDX Flow Control Port Type Auto IP Configuration Switch IP AddressSwitch Subnet Mask Default Gateway Time Current TimeCurrent Date System Up Time System File Update-By Remote Tftp System File Update-By Local Import/Export System File Update-By CF Card Using Port TrunkingFactory Default Port Trunking Concept Configuring Port Trunking Setting Description Trunk Group Maximum of 4 trunk groupsTrunk Type Member Ports/Available Ports Configuring Snmp Snmp Snmp Read/Write Settings Snmp VersionsV1, V2c Read Community V1, V2c Write/Read Community Trap Settings Trap Server IP/Name Using Communication Redundancy Switch Object IDPrivate MIB information Gigabit Ethernet Redundant Ring Capability 300 ms Initial Setup Turbo Ring Concept When the number of EDS-726 units in the Turbo Ring is even Ring Coupling Configuring Turbo Ring STP/RSTP Concept What is STP? STP Requirements How STP WorksPort Speed Path Cost 802.1D Edition 802.1w-2001 STP Configuration STP ReconfigurationDifferences between Rstp and STP STP Calculation Using STP on a Network with Multiple VLANs STP Example Configuring STP/RSTP Forwarding Delay Root/Not RootProtocol of Redundancy Bridge priority Configuration Limits of RSTP/STP Enable STP per PortPort Priority Port Cost Using Traffic Prioritization What is Traffic Prioritization?Traffic Prioritization Concept How Traffic Prioritization Works Ieee 802.1p Priority Level Ieee 802.1D Traffic Type Differentiated Services DiffServ Traffic MarkingTraffic Prioritization QoS Classification Configuring Traffic PrioritizationTraffic Queues Default Port Priority Queuing MechanismInspect TOS Inspect COS CoS Mapping Setting Description FactoryTOS/DiffServ Mapping What is a VLAN? Using Virtual LANVirtual LAN Vlan Concept VLANs and Moxa EtherDevice Switch Benefits of VLANsManaging a Vlan Communication Between VLANs Sample Applications of VLANs using Moxa EDS-726 HUB Configuring 802.1Q Vlan Vlan Port Settings Management Vlan ID Port PvidPort Fixed Vlan List Tagged Port Forbidden Vlan List Using Multicast Filtering What is an IP Multicast?Concept of Multicast Filtering Benefits of Multicast Multicast Filtering Network without multicast filtering Multicast Filtering and Moxa EtherDevice Switch Igmp Internet Group Management Protocol Snooping ModeQuery Mode Igmp Multicast Filtering Configuring Igmp Snooping Igmp Snooping SettingsStatic Multicast MAC Enabling Multicast Filtering Igmp Snooping Static Multicast Router PortQuerier Igmp Table Add Static Multicast MAC Add New Static Multicast Address to the ListNone Join Port Configuring Gmrp Port Setting Description Factory DefaultGmrp enable Setting Description Factory Default Port Mode Setting Description Factory Default Using Bandwidth Management Configuring Bandwidth ManagementGmrp Table Broadcast Storm Protection Using Port Access Control Traffic Rate Limiting SettingsIeee Static Port Lock Message Exchange Configuring Ieee 802.1X Database Option Radius ServerServer Port Shared Key Local User Database Setup 802.1X Re-Authentication802.1X Re-Authentication Static Port Lock Local User Database Setup802.1X Table Configuring Email Warning Using Auto WarningEmail Alarm Events Settings MoxaEtherDeviceSwitch0001@SwitchLocation Event TypesSystem Event Port Event Email Settings Configuring Relay Warning Relay Alarm Events SettingsConfiguring Relay Event Types Activate your settings Relay Alarm List Override relay alarm settings Using Line-Swap-Fast-Recovery Using Set Device IPConfiguring Line-Swap Fast Recovery Enable Line-Swap-Fast-Recovery Configuring Set Device IP Set up the connected devices Using Diagnosis Mirror PortOutput data stream Bi-directional Monitor by Switch Using MonitorPing Using the MAC Address Table Monitor by Port Using Event Log ALL EDS Configurator GUI Starting EDS Configurator Broadcast Search Upgrade Firmware Search by IP address Modify 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 Group MIB II.11 Snmp Group MIB II.10 Transmission GroupMIB II.17 dot1dBridge Group Public Traps Private Traps Modular Managed Switch System, EDS-72610G Interface Gigabit Ethernet Interface Module, IM series PowerMechanical Fast Ethernet Interface Module, IM series Optical Fiber Interface Environmental Regulatory Approvals Service Information Moxa Internet Services Following services are provided Problem Report Form Serial Number Product Return Procedure