Enabling outputting port state transition information

In a large-scale spanning tree network, you can enable devices to output the port state transition information. Then you can monitor the port states in real time.

To enable outputting port state transition information:

Step	Command	Remarks
1. Enter system view.	system-view	N/A
2. Enable outputting port state transition information.	In STP/RSTP mode:stp port-log instance 0 In PVST mode:stp port-log vlan vlan-id-list In MSTP mode:stp port-log { all \| instance instance-list }	By default, this function is disabled.

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Configuring the mode a port uses to recognize and send MSTP packets	home	Enabling the spanning tree feature