Specifications

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DCS-3950 series Ethernet switch manual
Note: For the complicated network, especially need to switch from one spanning tree
branch to another rapidly, the disable mode is not recommended.
Example:
Switch(Config)#spanning-tree tcflush disable
Switch(Config)#
10.2.2.23 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 every ten seconds
Default: Global configuration
Command mode: Interface Mode
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
Notes: For the complicated network, especially need to switch from one spanning tree
branch to another rapidly, the disable mode is not recommended.
Example:
Switch(Config)#interface ethernet 0/0/2
Switch(Config-Ethernet-0/0/2)#spanning-tree tcflush disable
Switch(Config-Ethernet-0/0/2)#
10.3 MSTP Configuration Example
The following is a typical MSTP application scenario: