Moxa Technologies EDS-408A, 405A SERIES STP Example, Using STP on a Network with Multiple VLANs

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EDS-408A/405A Series User’s Manual

Featured Functions

STP Example

The LAN shown below has three segments, with adjacent segments connected using two possible links. The various STP factors, such as Cost, Root Port, Designated Bridge Port, and Blocked Port are shown in the figure.

LAN Segment 1

Port 1 (Designated Bridge Port)

Bridge A

Port 2

(Root Bridge)

Port 1

(Root Port)

Cost =100

Bridge B

Port 2 (Designated Bridge Port)

Port 1

(Root Port)

Cost =100

Bridge X

Port 2 (Blocked Port)

LAN Segment 2

Port 1

(Root Port)

Cost =100

Bridge C

Port 2 (Designated Bridge Port)

Port 1

(Root Port)

Cost =200

Bridge Y

Port 2 (Blocked Port)

LAN Segment 3

yBridge A has been selected as the Root Bridge, since it was determined to have the lowest Bridge Identifier on the network.

ySince Bridge A is the Root Bridge, it is also the Designated Bridge for LAN segment 1. Port 1 on Bridge A is selected as the Designated Bridge Port for LAN Segment 1.

yPorts 1 of Bridges B, C, X, and Y are all Root Ports since they are nearest to the Root Bridge, and therefore have the most efficient path.

yBridges B and X offer the same Root Path Cost for LAN segment 2. However, Bridge B was selected as the Designated Bridge for that segment since it has a lower Bridge Identifier. Port 2 on Bridge B is selected as the Designated Bridge Port for LAN Segment 2.

yBridge C is the Designated Bridge for LAN segment 3, because it has the lowest Root Path Cost for LAN Segment 3:

¾The route through Bridges C and B costs 200 (C to B=100, B to A=100)

¾The route through Bridges Y and B costs 300 (Y to B=200, B to A=100)

yThe Designated Bridge Port for LAN Segment 3 is Port 2 on Bridge C.

Using STP on a Network with Multiple VLANs

IEEE Std 802.1D, 1998 Edition, does not take into account VLANs when calculating STP information—the calculations depend only on the physical connections. Consequently, some network configurations will result in VLANs being subdivided into a number of isolated sections by the STP system. You must ensure that every VLAN configuration on your network takes into account the expected STP topology and alternative topologies that may result from link failures. The following figure shows an example of a network that contains VLANs 1 and 2. The VLANs are connected using the 802.1Q-tagged link between Switch B and Switch C. By default, this link

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Contents Moxa EtherDevice Switch EDS-408A/405A Series User’s Manual Second Edition, JulyTrademarks Copyright NoticeDisclaimer Table of Contents Chapter EDS Configurator GUI Introduction Inside the Future of Industrial Ethernet Technology Moxa EtherDevice SwitchPackage Checklist Industrial vs. CommercialUseful Utility and Remote Configuration Optional AccessoriesFeatures Advanced Industrial Networking CapabilityGetting Started RS-232 Console Configuration 115200, None, 8, 1, VT100 Connection CautionEDS-408A/405A Series User’s Manual Key Function Configuration Using a Telnet Console Configuration Using a Web Browser EDS-408A/405A Series User’s Manual Disabling Telnet and Browser Access ConfigurationFeatured Functions Configuring Basic Settings System IdentificationPassword PasswordAccount Any host can access the EDS-408A/405A Accessible IPAllowable Hosts Input format Port EnableName FDX Flow Control NetworkPort Transmission Speed Port TypeSwitch Subnet Mask Auto IP ConfigurationSwitch IP Address Default GatewayCurrent Time TimeDaylight Saving Time Current DateTurbo Ring DIP Switch Disable the Turbo Ring DIP Switch How to Enable or Disable the Turbo Ring DIP SwitchesSet DIP switch as Turbo Ring / Set DIP switch as Turbo Ring Redundancy Protocol drop-down box. See the Configuring How to Configure the Turbo Ring DIP SwitchesTurbo Ring and Turbo Ring V2 section in this chapter for System File Update-By Remote Tftp System File Update-By Local Import/Export Factory Default System File Update-By Backup MediaRestart Configuring Snmp SnmpV1, V2c Read Community Snmp Read/Write SettingsSnmp Versions V1, V2c Write/Read CommunitySetting Description Factory Default Trap Server IP/Name Setting Description Factory DefaultUsing Communication Redundancy Turbo Ring ConceptInitial setup of a Turbo Ring or Turbo Ring V2 ring Ring Coupling Configuration Determining the Redundant Path of a Turbo Ring V2 RingRing Coupling for a Turbo Ring Ring Dual-Ring Configuration applies only to Turbo Ring Dual-Homing Configuration applies only to Turbo RingNow Active Configuring Turbo Ring and Turbo RingConfiguring Turbo Ring Master/SlaveSet as Master Enable Ring CouplingRedundancy Protocol Redundant PortsRing 1/2-1st Ring Port Status Ring 1/2-StatusRing 1/2-Master/Slave Ring 1/2-2nd Ring Port StatuIndicates either None, Dual Homing, or Ring Coupling Enable RingCoupling-Mode Coupling-Coupling Port statusPrimary/Backup Port Coupling ModeSTP/RSTP Concept What is STP? How STP Works STP RequirementsDifferences between Rstp and STP STP ConfigurationSTP Reconfiguration Port Speed Path Cost 802.1D Edition 802.1w-2001Using STP on a Network with Multiple VLANs STP ExampleConfiguring STP/RSTP Protocol of Redundancy Forwarding DelayRoot/Not Root Bridge priorityConfiguration Limits of RSTP/STP Traffic Prioritization Concept Using Traffic PrioritizationWhat is Traffic Prioritization? How Traffic Prioritization WorksIeee 802.1p Priority Level Ieee 802.1D Traffic Type Differentiated Services DiffServ Traffic MarkingTraffic Prioritization Traffic Queues Queuing Mechanism Configuring Traffic PrioritizationQoS Classification Inspect TOSInspect COS Default Port PriorityCoS Mapping Virtual LAN Vlan Concept Using Virtual LANsWhat is a VLAN? TOS/DiffServ MappingPort-based VLANs and the Moxa EtherDevice Switch Using Virtual LANsBenefits of VLANs Settings-Turbo Ring DIP Switch Configuring Rate Limiting Using Rate LimitingPolicy Using Auto Warning Configuring Email WarningActivate your settings and test email if necessary Email Warning Events SettingsConfiguring Email Settings Event TypesMoxaEtherDeviceSwitch0001@SwitchLocation Email SettingsPort Event Configuring Relay Warning Relay Warning Events Settings Activate your settingsOverride Relay Warning Settings Using Line-Swap-Fast-RecoveryRelay Warning List Configuring Line-Swap Fast Recovery Using Set Device IPEnable Line-Swap-Fast-Recovery Mirror Port Using DiagnosisConfiguring Set Device IP Desired IP AddressOutput data stream PingInput data stream Bi-directionalMonitor by Switch Using the MonitorMonitor by Port Using the MAC Address Table ALLUsing Event Log Using SyslogSyslog Server EDS Configurator GUI Starting EDS Configurator Broadcast SearchUpgrade Firmware Search by IP addressModify IP Address Export Configuration Import Configuration Unlock Server EDS-408A/405A Series User’s Manual MIB Groups MIB II.16 RmonTechnology SpecificationsPower InterfaceEnvironment MechanicalRegulatory Approvals Service Information Moxa Internet Services Following services are providedMoxa Products Problem Report FormSerial Number Product Return Procedure
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405A SERIES, EDS-408A specifications

Moxa Technologies has established itself as a leader in networking solutions, particularly for industrial applications. Among their cutting-edge products is the 405A Series, specifically the EDS-408A model, which exemplifies Moxa's commitment to performance, reliability, and versatility in industrial Ethernet switches.

The EDS-408A is an 8-port industrial Ethernet switch that offers an impressive array of features and capabilities designed to meet the demands of harsh environments. One of its main highlights is the ability to support both 10/100 Mbps Fast Ethernet and Gigabit Ethernet connections, providing users with the flexibility to integrate a range of devices within their network. Its robust design ensures that it operates seamlessly in extreme conditions, with a wide operating temperature range from -40 to 75 degrees Celsius.

The EDS-408A is built to support an array of networking topologies. It features advanced Ethernet switching technologies that enable fast and efficient data transfer while minimizing latency. The device is equipped with wire-speed forwarding capabilities, which is vital for maintaining high performance in heavy network traffic scenarios.

Another key feature of the EDS-408A is its redundancy support. The switch incorporates various redundancy protocols, including Rapid Spanning Tree Protocol (RSTP) and MRP (Media Redundancy Protocol), which enhance network reliability by allowing quick recovery in the event of a failure. This ensures continuous network uptime, which is critical for industrial applications.

Furthermore, Moxa Technologies has adopted an user-friendly web-based management interface in the EDS-408A, simplifying the configuration and monitoring process. This allows system administrators to easily manage settings, monitor traffic, and troubleshoot issues in real time. Additionally, the switch supports SNMP (Simple Network Management Protocol) for remote monitoring and management, enabling organizations to keep their networks optimized.

Security is another paramount feature of the EDS-408A. It includes built-in security mechanisms such as port security, VLAN, and access control lists (ACLs), which help safeguard sensitive network segments from unauthorized access.

In conclusion, Moxa Technologies' EDS-408A model from the 405A Series is a robust and feature-rich industrial Ethernet switch designed for demanding environments. With its support for various network protocols, redundancy features, user-friendly management, and enhanced security, the EDS-408A stands out as a reliable solution for organizations looking to enhance their industrial networking capabilities.
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