Moxa Technologies EDS-405A Differences between Rstp and STP, Port Speed Path Cost 802.1D Edition

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EDS-408A/405A Series User’s Manual

Featured Functions

yEach port has a cost that specifies the efficiency of each link. The efficieny cost is usually determined by the bandwidth of the link, with less efficient links assigned a higher cost. The following table shows the default port costs for a switch:

Port Speed

Path Cost 802.1D,

 

1998 Edition

10 Mbps

100

100 Mbps

19

1000 Mbps

4

Path Cost 802.1w-2001 2,000,000 200,000 20,000

STP Calculation

The first step of the STP process is to perform calculations. During this stage, each bridge on the network transmits BPDUs. The following items will be calculated:

yThe bridge that should be the Root Bridge. The Root Bridge is the central reference point from which the network is configured.

yThe Root Path Costs for each bridge. This is the cost of the paths from each bridge to the Root Bridge.

yThe identity of each bridge’s Root Port. The Root Port is the port on the bridge that connects to the Root Bridge via the most efficient path; in other words, the port connected to the Root Bridge via the path with the lowest Root Path Cost. The Root Bridge, however, does not have a Root Port.

yThe identity of the Designated Bridge for each LAN segment. The Designated Bridge is the bridge with the lowest Root Path Cost from that segment. If several bridges have the same Root Path Cost, the one with the lowest Bridge Identifier becomes the Designated Bridge. Traffic transmitted in the direction of the Root Bridge will flow through the Designated Bridge. The port on this bridge that connects to the segment is called the Designated Bridge Port.

STP Configuration

After all the bridges on the network agree on the identity of the Root Bridge, and all other relevant parameters have been established, each bridge is configured to forward traffic only between its Root Port and the Designated Bridge Ports for the respective network segments. All other ports are blocked, which means that they will not be allowed to receive or forward traffic.

STP Reconfiguration

Once the network topology has stabilized, each bridge listens for Hello BPDUs transmitted from the Root Bridge at regular intervals. If a bridge does not receive a Hello BPDU after a certain interval (the Max Age time), the bridge assumes that the Root Bridge, or a link between itself and the Root Bridge, has gone down. This will trigger the bridge to reconfigure the network to account for the change. If you have configured an SNMP trap destination, when the topology of your network changes, the first bridge to detect the change sends out an SNMP trap.

Differences between RSTP and STP

RSTP is similar to STP, but includes additional information in the BPDUs that allow each bridge to confirm that it has taken action to prevent loops from forming when it decides to enable a link to a neighboring bridge. Adjacent bridges connected via point-to-point links will be able to enable a link without waiting to ensure that all other bridges in the network have had time to react to the change. The main benefit of RSTP is that the configuration decision is made locally rather than network-wide, allowing RSTP to carry out automatic configuration and restore a link faster than STP.

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Contents Fourth Edition, June Moxa EtherDevice Switch EDS-408A/405A Series User’s ManualCopyright Notice TrademarksDisclaimer Table of Contents Appendix a MIB Groups Appendix B Specifications Introduction Package Checklist Moxa EtherDevice SwitchInside the Future of Industrial Ethernet Technology Industrial vs. CommercialFeatures Optional AccessoriesUseful Utility and Remote Configuration Advanced Industrial Networking CapabilityGetting Started Connection Caution RS-232 Console Configuration 115200, None, 8, 1, VT100EDS-408A/405A Series User’s Manual Getting Started Key Function Configuration Using a Telnet Console Configuration Using a Web Browser EDS-408A/405A Series User’s Manual Getting Started Configuration Disabling Telnet and Browser AccessFeatured Functions System Identification Configuring Basic SettingsPassword PasswordAccount Accessible IP Any host can access the EDS-408A/405AAllowable Hosts Input format Enable PortName Port Transmission Speed NetworkFDX Flow Control Port TypeSwitch IP Address Auto IP ConfigurationSwitch Subnet Mask Default GatewayDaylight Saving Time TimeCurrent Time Current DateTurbo Ring DIP Switch How to Enable or Disable the Turbo Ring DIP Switches Disable the Turbo Ring DIP SwitchSet DIP switch as Turbo Ring / Set DIP switch as Turbo Ring How to Configure the Turbo Ring DIP Switches Redundancy Protocol drop-down box. See the ConfiguringTurbo Ring and Turbo Ring V2 section in this chapter for System File Update-By Remote Tftp System File Update-By Local Import/Export System File Update-By Backup Media Factory DefaultRestart Snmp Configuring SnmpSnmp Versions Snmp Read/Write SettingsV1, V2c Read Community V1, V2c Write/Read CommunityTrap Server IP/Name Setting Description Factory Default Setting Description Factory DefaultTurbo Ring Concept Using Communication RedundancyInitial setup of a Turbo Ring or Turbo Ring V2 ring Determining the Redundant Path of a Turbo Ring V2 Ring Ring Coupling ConfigurationRing Coupling for a Turbo Ring V2 Ring Dual-Homing Configuration applies only to Turbo Ring Dual-Ring Configuration applies only to Turbo RingConfiguring Turbo Ring Configuring Turbo Ring and Turbo RingNow Active Master/SlaveRedundancy Protocol Enable Ring CouplingSet as Master Redundant PortsRing 1/2-Master/Slave Ring 1/2-StatusRing 1/2-1st Ring Port Status Ring 1/2-2nd Ring Port StatuCoupling-Mode Enable RingIndicates either None, Dual Homing, or Ring Coupling Coupling-Coupling Port statusCoupling Mode Primary/Backup PortSTP/RSTP Concept What is STP? STP Requirements How STP WorksSTP Reconfiguration STP ConfigurationDifferences between Rstp and STP Port Speed Path Cost 802.1D EditionSTP Example Using STP on a Network with Multiple VLANsVLAN1 Configuring STP/RSTPRoot/Not Root Forwarding DelayProtocol of Redundancy Bridge priorityConfiguration Limits of RSTP/STP What is Traffic Prioritization? Using Traffic PrioritizationTraffic Prioritization Concept How Traffic Prioritization WorksDifferentiated Services DiffServ Traffic Marking Ieee 802.1p Priority Level Ieee 802.1D Traffic TypeTraffic Prioritization Traffic Queues QoS Classification Configuring Traffic PrioritizationQueuing Mechanism Inspect TOSDefault Port Priority Inspect COSCoS Mapping What is a VLAN? Using Virtual LANsVirtual LAN Vlan Concept TOS/DiffServ MappingUsing Virtual LANs Port-based VLANs and the Moxa EtherDevice SwitchBenefits of VLANs Settings-Turbo Ring DIP Switch Using Rate Limiting Configuring Rate LimitingPolicy Configuring Email Warning Using Auto WarningConfiguring Email Settings Email Warning Events SettingsActivate your settings and test email if necessary Event TypesEmail Settings MoxaEtherDeviceSwitch0001@SwitchLocationPort Event Configuring Relay Warning Activate your settings Relay Warning Events SettingsUsing Line-Swap-Fast-Recovery Override Relay Warning SettingsRelay Warning List Using Set Device IP Configuring Line-Swap Fast RecoveryEnable Line-Swap-Fast-Recovery Configuring Set Device IP Using DiagnosisMirror Port Desired IP AddressInput data stream PingOutput data stream Bi-directionalUsing the Monitor Monitor by SwitchMonitor by Port ALL Using the MAC Address TableUsing Syslog Using Event LogSyslog Server EDS Configurator GUI Broadcast Search Starting EDS ConfiguratorSearch by IP address Upgrade FirmwareModify IP Address Export Configuration Import Configuration Unlock Server EDS-408A/405A Series User’s Manual EDS Configurator GUI MIB Groups Technology PowerInterface Optical FiberMechanical EnvironmentRegulatory Approvals
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EDS-405A, 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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