Zhenjia Zhang focused on improving the reliability of BFD session establishment in VRF-lite environments within the edge-core/sonic-buildimage repository. By analyzing and adjusting the VRFID logic to use more reliable interface information, Zhang resolved persistent 'wrong vrfid' errors that previously disrupted BFD session continuity. The solution involved a targeted patch to the FRR-based networking stack, written in C, which enhanced compatibility with VRF handling and reduced troubleshooting time for network operators. Zhang’s work demonstrated a strong understanding of BFD, BGP, and VRF concepts, delivering a well-validated fix that improved operational stability without introducing new features during the period.