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environment to do FLUSH with every topology change. At the same time, as a method to
avoid network assault, we allow the network administrator to configure FLUSH mode by
the command
Note: For the complicated network, especially need to switch from one spanning tree
branch to another rapidly, the disable mode is not recommended.
Example: Configure the spanning-tree flush mode once the topology change is not flush
to TC.
Switch(config)#interface ethernet 1/2
Switch(Config-If-Ethernet1/2)#spanning-tree tcflush disable
Switch(Config-If-Ethernet1/2)#
6.1.31 spanning-tree transmit-hold-count
Command: spanning-tree transmit-hold-count <tx-hold-count-value>
no spanning-tree transmit-hold-count
Function: Set the max transmit-hold-count of port.
Parameter: tx-hold-count-value: ranging from 1 to 20, the default value is 10.
Command mode: Global Mode
Default: 10.
Usage Guide: Set the max number for sending BPDU within the Hello Time interval to
control BPDU flow. The variable is used to whole MST bridge.
Example: Set the max transmit-hold-count as 20.
Switch(config)#spanning-tree transmit-hold-count 20
6.2 Commands for Monitor and Debug
6.2.1 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: Admin Mode
Usage Guide: This command is the general switch for all the MSTP debugging. Users
should enable the detailed debugging information, and then they can use this command to
display the relevant debugging information. In general, this command is used by skilled
technicians.