STP, RSTP, and MSTP differences for AR router

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The differences between STP, RSTP, and MSTP are as follows:
- STP: Indicates Spanning Tree Protocol and supports single instances only.
- RSTP: Indicates Rapid Spanning Tree Protocol and supports fast convergence and single instances.
- MSTP: Inherits the advantages of RSTP and supports multiple instances.

Other related questions:
What are the differences between STP, RSTP, and MSTP
The differences between Spanning Tree Protocol (STP), Rapid Spanning Tree Protocol (RSTP), and Multiple Spanning Tree Protocol (MSTP) are as follows: -STP: only supports a single instance. -RSTP: supports fast convergence and a single instance. -MSTP: includes the advantages of RSTP, and supports multiple instances.

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.

What is the default STP mode for S series switches
For S (except the S1700) and E series switches, STP works in MSTP mode by default.

STP enabling/disabling method on an AR router
By default, STP is enabled on an AR router globally and on Layer 2 interface. Run the stp enable command in the system or interface view to enable STP globally or on Layer 2 interface. Run the stp disable command in the system or interface view to disable STP globally or on Layer 2 interface.

Whether to enable STP if an AR router is used as a user access device
If an AR is used as a user access device (the WAN interface of the router is connected to the Internet, and the LAN interface is connected to an intranet), you are advised to disable STP to avoid network flapping due to STP convergence.

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