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Can Switches Using RSTP and STP Be Connected?
Switches using RSTP and STP can be connected. STP protocols include
the STP, RSTP, and MSTP protocols. These protocols support forward
compatibility and connection to a certain extent. The following table
describes the connection effects.
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| Scenario | Connection Effect |
|---|---|
| An STP device connects to an RSTP device. | RSTP connects to the STP port, and the mode automatically changes to STP to implement slow convergence. |
| An RSTP device connects to an MSTP device. | The CIST can be connected. That is, instance 0 can be connected. The connection ports are inter-AS ports. |
| An MSTP device connects to an STP device. | MSTP connects to the STP port, and the mode automatically changes to STP to implement slow convergence. |
When a port whose mode switches reconnects
to another device, the original mode must be restored by running the stp mcheck command.