Developed advanced Spanning Tree Protocol (STP) features across the sonic-buildimage, sonic-swss, and sonic-utilities repositories, focusing on robust network configuration and automation. Introduced YANG model support for PVST and MSTP in sonic-buildimage, updating both the model files and Python code to enable granular STP parameter definitions. Implemented MSTP support in sonic-swss by enhancing stpmgr for MST instance and port management, leveraging SAI APIs for integration. Extended sonic-utilities with comprehensive CLI and configuration database capabilities, supporting global, region, instance, and interface-level MSTP configuration. Utilized C++, Python, and YANG modeling to deliver maintainable, standards-based enhancements for SONiC networking platforms.