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.

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