Solutions

Wintop’s industrial switches and optical transceiver product lines cover every stage from substations to distribution networks. Designed for wide-temperature operation, they deliver high reliability and stable performance. We tailor solutions to your needs to help you meet the toughest environmental challenges.

Configuration of RSTP Ring Network for Layer 3 Switches in the 37/57 Series

Time：2025-06-18 Views：986

1. Web Interface Configuration

1. Log into the switch using a browser.

Web page: http://192.168.0.1, default username: admin, default password: admin.

2. Enable the RSTP ring network function.

Enter the switch IP in your browser to access the management page. Navigate to Reliability Configuration / MSTP Configuration / Basic Information Configuration, enable the Spanning Tree Protocol Management Status, and select RSTP as the Spanning Tree Running Mode (default is MSTP). Click Apply.

Enable - Turn on Spanning Tree.

Disable - Turn off Spanning Tree.

3. Set the number of RSTP ring network switches.

(1) RSTP ring network setup for 20 switches.

① Set the maximum hop count to 20, maximum age to 20, and state transition delay to 15 (default configuration).

(2) RSTP ring network setup for 40 switches.

① Set the maximum hop count to 40, maximum age to 40, state transition delay to 30.

4. Select ring network ports.

After enabling the RSTP function on the switch, all ports will enable RSTP functionality.

5. Save the configuration.

1) After configuring the ring network functionality, it is essential to save the settings; otherwise, the switch will revert to default upon reboot.

2) Click the Save button.

2. Switch Root Bridge Settings

1. When is it necessary to set the root bridge - root switch?

1) In a single ring state, it is not necessary to set a root switch.

2) In a multi-ring state, it is best to set the center as the root switch (root bridge); only one root switch is allowed within the multi-ring.

Root switch priority: 4096 (only one allowed)

Other switch priority: 32768 (default)

2. Layer 3 Switch Root Bridge Configuration

1) Reliability Configuration / MSTP Configuration / MST Domain Configuration / Domain Instance Information, click Modify.

2) In the domain instance information, select and modify the priority or enable the designated root to set the root switch.

① Modify priority to set the root bridge.

② Enable the designated root function to set the root bridge.

 true: Configure as the root device

 false: Do not configure as the root device.

3. Check the learning status of the ring network switches.

1) The central switch learns the root bridge as its own MAC; the bridge MAC should be the same as the root bridge MAC.

2) Other switches in the ring will have their bridge ID as their own MAC information, while the root bridge ID will be that of the central switch's MAC information. If two root bridge IDs appear in a multi-ring, a broadcast storm will occur in the network.

3. How to Obtain Adjacent Switch IP Addresses

1. Why use LLDP Protocol (Link Layer Discovery Protocol)?

1) Switches often have incomplete configurations or fail to save configurations, resulting in the switch reverting to default upon reboot, which also leads to issues like storms in the ring network after running for a while.

2) Technical engineers, to configure switch functions, need to visit every switch installation point for configuration, which is time-consuming.

3) If fiber connections are normal in the field, engineers can configure each switch remotely from the control room, maximizing the use of every switch function to reduce workload and enhance operational skills. The switch is set to enable LLDP discovery protocol by default. By connecting a debugging computer to the central control room's ring network switch, one can log into the webpage to find LLDP protocol information, which allows confirmation of the adjacent switch's IP and other details. By doing so for each switch, one can summarize the IP addresses of the switches at each point based on the installation diagram and create an IP planning table for each switch location.

4) CM5728 has LLDP discovery protocol disabled by default.

① Navigate to the function menu: System Management / LLDPLLDP Configuration.

② Click the open/close button for LLDP global management status.

2. View LLDP Neighbor Information.

1) Navigate to the function menu: System Management / LLDPLLDP Neighbor Information.

2) View the LLDP Information Table to see the IP addresses of adjacent switches connected via optical ports.

a. ge1/1/4 connected to the next switch IP - 192.168.1.14

b. ge1/1/6 connected to the next switch IP - 192.168.1.12

c. ge1/1/10 connected to the next switch IP - 192.168.1.11

d. ge1/1/12 connected to the next switch IP - 192.168.1.10

4. Command Line Configuration

1. Telnet Command Line Operation

1) Press Win+R and type CMD.

2) C:\Users\>> telnet 192.168.0.1

Username: admin

Password: admin

Switch> en

Switch# config

Switch(config)# spanning-tree enable // Enable global spanning tree

Switch(config)# spanning-tree mode rstp // Set spanning tree mode to RSTP

2. RSTP ring network setup for 40 switches

Switch(config)# spanning-tree max-age 40 // Set maximum age to 40

Switch(config)# spanning-tree max-hops 40 // Set maximum hop count to 40

Switch# write// Save configuration

Switch(config)# interface gigaethernet 1/1/1 // Enter interface 1/1/1

Switch(config-gigaethernet1/1/1)# spanning-tree disable // Disable spanning tree function on port 1/1/1

3. Setting the Root Bridge Switch

1) Switch(config)# spanning-tree priority 4096 // Set root bridge priority to 4096

2) Switch(config)# spanning-tree root primary // Configure switch as the primary root switch
Switch(config)# no spanning-tree root // Disable designated root function

Previous Article：RSTP Ring Network Configuration for RS6000 Series Next Article：Service Guide

Solutions

Advanced R&D Capabilities

Committed to becoming
a global leader in industrial connectivity

Configuration of RSTP Ring Network for Layer 3 Switches in the 37/57 Series

Solutions

Advanced R&D Capabilities

Committed to becominga global leader in industrial connectivity

Configuration of RSTP Ring Network for Layer 3 Switches in the 37/57 Series

Committed to becoming
a global leader in industrial connectivity