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Switch(Config-Mstp-Region)#
6.4.1.4 debug spanning-tree
Command: debug spanning-tree
no debug spanning-tree
Function: Enable the MSTP debugging information; The command “no debug
spanning-tree” disables the MSTP debugging information
Command mode: Privileged Mode
Usage Guide: This command is the general switch for all the MSTP debugging. Users
should enable the detailed debugging information, then they can use this command to
display the relevant debugging information. In general, this command is used by skilled
technicians.
Example: Enable to receive the debugging information of BPDU messages on the port
1/1
Switch#debug spanning-tree
Switch#debug spanning-tree bpdu rx interface e1/1
6.4.2 MSTP Troubleshooting Help
& In order to run the MSTP on the switch port, the MSTP has to be enabled globally. If
the MSTP is not enabled globally, it can’t be enabled on the port.
& The MSTP parameters co work with each other, so the parameters should meet the
following conditions. Otherwise, the MSTP may work incorrectly.
2×(Bridge_Forward_Delay – 1.0 seconds) >= Bridge_Max_Age
Bridge_Max_Age >= 2 ×(Bridge_Hello_Time + 1.0 seconds)
& When users modify the MSTP parameters, they have to be sure about the changes of
the topologies. The global configuration is based on the bridge. Other configurations
are based on the individual instances.
& The MSTP are mutually exclusive with MAC binding and IEEE 802.1x on the switch
port. If MAC binding or IEEE 802.1x is enabled on the port, the MSTP can’t apply to
this port.