User's Manual

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no spanning-tree loopfast
Globally disables Loop Fast.
Use the following command in interface configuration mode to enable Loop Fast:
Command Purpose
spanning-tree loopfast
Enables loop fast feature on the interface.
no spanning-tree loopfast
Disables Loop Fast feature on the interface.
If the global loop fast is configured, the feature
on the interface remains effective.
spanning-tree loopfast disable
Disables Loop Fast on the interface.
37.2.10 Configuring Address Table Aging Protection
Under the circumstance of changeable network topology, the configuration of address table aging protection
will not affect communication as a result of STP frequently changing the MAC address table.
STPs, such as RSTP and MSTP, will clear the MAC address table of the switch when detecting the STP
topology change (delete the old MAC address and update the MAC address), so that the communication can
be recovered rapidly. By default, clear action is finished through MAC address table fast aging. Most switches
can finish MAC address table fast aging within 1 minute and has little effect on the performance of CPU.
After enabling the address table aging protection function, STP enables protection timer after running the first
aging. Before the timeout, another aging will not run. The timer is 15 seconds by default. If the network topology
changes within 15 seconds, STP will run a second aging automatically after the timeout.
Note:
The command no spanning-tree fast-aging can disable STP running address table aging. Before running
the configuration, please ensure the network does not exist loop. Otherwise, the terminal device may need5
mins or even longer time to resume the communication after the network topology changes
In global configuration mode, run following command to configure the address table aging protection function.
Command Purpose
spanning-tree fast-aging
Enable/disable address table aging function.
spanning-tree fast-aging protection
Enable/disable address table aging protection
function.
spanning-tree fast-aging protection time
Sets the time of address table aging protection.
Before the time, STP can only run address table
aging once.
The default value is 15 second.
Use the no form of this command to resume the default setting