EDS-510A Series User’s Manual

Featured Functions

yWhich bridge 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.

STP Example

The LAN shown in the following figure 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.

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Moxa Technologies Moxa EtherDevice Switch, EDS-510A Differences between Rstp and STP, STP Example, STP Configuration
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EDS-510A, Moxa EtherDevice Switch specifications

Moxa Technologies is a leader in providing innovative networking solutions for industrial applications, and one of its standout products is the Moxa EtherDevice Switch, EDS-510A. This robust, managed Ethernet switch is specifically designed for reliable performance in challenging industrial environments, making it an ideal choice for various applications, including automation, transportation, and power generation.

The EDS-510A features five 10/100Base-TX Fast Ethernet ports, allowing flexibility in connecting multiple devices. Additionally, it offers two Gigabit Ethernet ports for uplink, enabling high-speed connections to aggregation switches or routers. The switch supports both redundant power inputs and a wide operating temperature range of -40 to 75 degrees Celsius, ensuring continuity of service even in extreme conditions.

One of the key features of the EDS-510A is its support for IEEE 802.3at PoE (Power over Ethernet). This technology allows the switch to deliver power to connected devices such as IP cameras and wireless access points through the Ethernet cable, which simplifies installation and reduces the need for additional power sources. This is especially beneficial in remote locations where power availability may be limited.

The EDS-510A is also equipped with advanced management features that include VLAN support, port mirroring, and QoS (Quality of Service) capabilities. These features enhance network performance and security, enabling users to prioritize critical traffic and segment the network for better control. Moreover, it supports SNMP (Simple Network Management Protocol), allowing for easy integration into existing network management systems.

Another notable characteristic is the switch's rugged design. With a metal housing that provides excellent EMI (Electromagnetic Interference) protection, the EDS-510A can withstand harsh industrial environments. It is also compliant with various industrial standards, reinforcing its suitability for mission-critical applications.

In summary, the Moxa EtherDevice Switch, EDS-510A, is engineered to meet the demands of modern industrial networking. With its combination of PoE capability, advanced management features, and rugged design, it ensures reliable and efficient network performance, making it an excellent choice for organizations looking to enhance their industrial networking infrastructure. Whether deployed in factories, transportation systems, or utility environments, the EDS-510A continues to be a trusted solution for numerous applications.
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