Description:
In many scenarios a redundant connection of network devices is required, which can only be implemented by redundant cabling. In order to prevent a loop, which would cripple the whole network, the Spanning Tree Protocol (STP) was created. By using STP only the shortest path is set active and the communication is transmitted via this path. When an outage of the active path occurs, a change to another path takes place.
This article describes how Rapid Spanning Tree Protocol (RSTP) can be configured on an XS series switch.
In contrast to STP topology changes happen much faster with RSTP, thus minimizing downtimes.
Requirements:
- LCOS SX as of version 5.10 Rel (download latest version)
- At least one other network device with active RSTP besides the XS series switch
Procedure:
1) Configuring RSTP:
1.1) Connect to the webinterface of the device and go to the menu Switching → Spanning Tree → Switch.
1.2) Modify the following parameters and click Submit:
- Spanning Tree Admin Mode: Make sure, that the option Enable is set.
- Force Protocol Version: In the dropdown menu select the option IEEE 802.1w. This is the designator for RSTP.
1.3) Go to the tab CST and optionally modify the Bridge Priority.
The lower the value for Bridge Priority, the higher the probability that the switch becomes Root Bridge.
1.4) Go to the menu System → Port → Summary.
1.5) Make sure, that the STP Mode is set to Enabled for all ports, where RSTP should be used (default setting).
1.6) Click on Save Configuration in the top right-hand corner to save the configuration as the start configuration.
The start configuration is retained even if the device is restarted or there is a power failure.
As an alternative you can also save the configuration as start configuration via the CLI with the command write memory.
1.7) Acknowledge the save process by clicking OK.
2) Controlling the Spanning Tree status for the individual switch ports:
2.1) Go to the menu Switching → Spanning Tree → CST Port.
2.2) The status information for the individual switch ports can viewed in the table Spanning Tree CST Port Summary.
