246
Note:Because the authentication string is related to instance ID and VLAN ID, the
command may cuase recognizing the equipment that with different instance and VLAN
relation as in the same region. Before the command is executed, make sure that instance
and VLAN relation is accord for all the equipment. If there are more than one equipment
connected , all the connected ports should executed this command.
Example:
Switch(Config)#interface ethernet 1/2
Switch(Config-Ethernet-1/2)#spanning-tree digest-snooping
8.3.21 spanning-tree tcflush (global mode)
Command:spanning-tree tcflush enable
spanning-tree tcflush disable
spanning-tree tcflush 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 every ten seconds
Default:
enable
。
Command mode:
Global 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
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)#
8.3.22 spanning-tree tcflush (port mode)
Command:spanning-tree tcflush {enable| disable| protect}
no
spanning-tree tcflush
