CycloneSTP
Spanning Tree Protocol Library (STP and RSTP)

CycloneSTP is an implementation of STP (Spanning Tree Protocol) and RSTP (Rapid Spanning Tree Protocol) algorithms suitable for resource-constrained microcontrollers. STP and RSTP are network protocols that can be implemented on Ethernet bridges to ensure loop-free LAN topologies. Spanning Tree Protocol allows a network design with multiple physical paths and backup links for redundancy purpose. If a link fails, STP or RSTP automatically reconfigures the network to establish a new loop-free tree topology.

CycloneSTP is available either as open source (GPLv2 license) or under a royalty-free commercial license (non-GPL license). We also propose an evaluation license (90-day license in source form) with technical support for an easier onboarding and effective evaluation of our software.

Main Features

• STP (Spanning Tree Protocol) implementation
• RSTP (Rapid Spanning Tree Protocol) implementation for faster convergence
• Prevents creation of loops
• Automatic reconfiguration of the tree in case of topology changes
• RSTP is designated to be backward compatible with STP
• Comprehensive user API to configure Spanning Tree Protocol parameters
• Supports BRIDGE-MIB (RFC 4188) to remotely manage and monitor STP operation
• Support RSTP-MIB (RFC 4318) to remotely manage RSTP-specific parameters
• Flexible memory footprint. Built-time configuration to embed only the necessary features
• Portable architecture (no processor dependencies)
• The library is distributed as a full ANSI C and highly maintainable source code

Supported Ethernet Switches

CycloneSTP supports 100Base-TX and Gigabit Ethernet switches from IC+, Marvell and Microchip.