How does an S series switch running STP update its forwarding table

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In STP converge normal mode, an S (except the S1700) series switch deletes MAC address entries or ages ARP entries. In STP converge fast mode, the switch deletes both MAC address and ARP entries.
Note:
By default, S series switches (except the S1700) running V100R006 and later versions work in STP converge normal mode, and E series switches work in STP converge normal mode.

Other related questions:
Which status do MSTP interfaces of an AR router have and how do they process packets
MSTP interface status: - Forwarding: In this state, an interface forwards user traffic. Only the root interface or a specified interface can be in this state. - Learning: This is a transitional state. In this state, a switch will build a MAC address table according to the user traffic it receives (but not forward the user traffic). That is why this state is referred to as a learning state. - Discarding: In this state, an interface blocks packets and does not learn MAC addresses.

Can an S series switch running RSTP be connected to another switch running STP
For S (except the S1700) series switches, STP protocols include the STP, RSTP, and MSTP protocols. These protocols are forward compatible and support device interconnection to a certain extent. The following describes the interconnection effects: 1. When an STP device connects to an RSTP device and the RSTP device connects to a port of the STP device, the RSTP mode automatically switches to STP to implement slow convergence. 2. When an RSTP device connects to an MSTP device, the CIST (instance 0) can be used to connect both devices. The connection ports are inter-AS ports. 3. When an MSTP device connects to an STP device and the MSTP device connects to a port of the STP device, the MSTP mode automatically switches to STP to implement slow convergence. Note: When a port whose mode switches to another mode is reconnected to another device, run the stp mcheck command to restore the original mode of the port.

How to configure the limit on the number of entries in the forwarding table on an S series switch
For S series switches, you can run the multicast forwarding-table route-limit limit command in the system view to set the maximum number of entries in the multicast forwarding table.

Must STP be disabled on interfaces running RRPP on an S series switch
For S series switches (except the S1700), RRPP and STP cannot be configured on the same interface simultaneously. STP is enabled on all interfaces by default. Therefore, before creating an RRPP ring, disable STP on the interfaces to be added to the RRPP ring.

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