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12.1.23 spanning-tree tcflush (Global mode)
Command: spanning-tree tcflush {enable| disable| protect}
no spanning-tree tcflush
Function: Configure the spanning-tree flush mode once the topology changes. ―no
spanning-tree tcflush‖ restores to default setting.
Parameter: enable: The spanning-tree flush once the topology changes.
disable: The spanning tree don‘t flush when the topology changes.
protect: the spanning-tree flush not more than one time every ten seconds.
Command mode: Global mode
Default: Enable
Usage Guide: According to MSTP, when topology changes, the port that send change
message clears MAC/ARP table (FLUSH). In fact it is not needed for some network
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 changes is not flush
to TC.
Switch(config)#spanning-tree tcflush disable
Switch(config)#
12.1.24 spanning-tree tcflush (Port mode)
Command: spanning-tree tcflush {enable| disable| protect}
no spanning-tree tcflush
Function: Configure the spanning-tree flush mode for port once the topology changes.
―no spanning-tree tcflush‖ restores to default setting.
Parameter: enable: The spanning-tree flush once the topology changes.
disable: The spanning tree don‘t flush when the topology changes.
protect: the spanning-tree flush not more than one time every ten seconds.
Command mode: Port Mode
Default: Global configuration
Usage Guide: According to MSTP, when topology changes, the port that send change
message clears MAC/ARP table (FLUSH). In fact it is not needed for some network
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
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