RSTP can interoperate with STP. However, the advantages offered by RSTP, such as rapid convergence, are lost when RSTP and STP interoperate.
On a network with both STP-capable and RSTP-capable devices, STP-capable devices discard RST BPDUs. If a port on an RSTP-capable device receives a configuration BPDU from an STP-capable device, the port switches to the STP mode and starts to send configuration BPDUs after two Hello timer intervals.
After the STP-capable device is removed, the port on the Huawei RSTP-capable device connected to the STP-capable device can be switched back to the RSTP mode.