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Which status do MSTP interfaces of an AR router have and how do they process packets

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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.

Other related questions:

Is the MSTP status of interfaces affected when the MSTP status of a member interface in the MST region changes

Yes. When the MSTP status of a member interface in the MST region changes, the device recalculates the MSTP status of all member interfaces in the MST region.

Which statuses does an MSTP interface have, and how does the interface process packets

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STP, RSTP, and MSTP differences for AR router

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.

Does a change in the MSTP status of an AR router interface affect the MSTP status of other interfaces in the same MST region

If the MSTP status of an interface changes, the device will recalculate the status of all other interfaces in the MST region.

which interfaces of AR routers do not support configuration NAT?

LAN side interface (such as VLANIF port) does not support to configure NAT.