After the shutdown and undo shutdown commands are used on a trunk member interface of an S6700, traffic is interrupted. Why

When the shutdown and undo shutdown commands are used on a trunk member interface of an S6700, the trunk bandwidth changes. The ifnet sends a port rate change event. MSTP responds to the event and delivers the Block flag to the outbound port. As a result, the outbound port cannot forward traffic. After 15s, MSTP delivers the forward flag to the port. Traffic can be forwarded. When the shutdown and undo shutdown commands are used on a trunk member interface of an S6700, traffic is interrupted for 15s.

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