Allied Telesis AT-S105 - Manual (Page 152)

Chapter 13: Spanning Tree and Rapid Spanning Tree Protocols
152
Mixed STP and RSTP Networks
RSTP IEEE 802.1w is fully compliant with STP IEEE 802.1d. Your network
can consist of bridges running both protocols. STP and RSTP in the same
network can operate together to create a single spanning tree domain.
If you decide to activate spanning tree on the switch, Allied Telesis
recommends RSTP instead of STP even when all of other switches in the
network are running STP. The AT-FS750/24POE and AT-FS750/48
switches can combine RSTP with the STP of the other switches.
The switches monitors the traffic on each port for BPDU packets. Ports
that receive RSTP BPDU packets operate in RSTP mode while ports
receiving STP BPDU packets operate in STP mode.