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DCS-3950 series Ethernet switch manual
no revision-level
Function: In MSTP region mode, this command is to set revision level for MSTP
configuration; the command ‘no revision-level’ restores the default setting to 0.
Parameter: <level> is revision level. The valid range is from 0 to 65535.
Command mode: MSTP region mode
Default: The default revision level is 0.
Usage Guide: This command is to set revision level for MSTP configuration. The bridges
with same MSTP revision level and same other attributes are considered in the same
MSTP region.
Example: Set revision level to 2000.
Switch(Config)#spanning-tree mst configuration
Switch(Config-Mstp-Region)# revision-level 2000
10.2.2.6 spanning-tree
Command: spanning-tree
no spanning-tree
Function: Enable MSTP in global mode and in interface mode; The command ‘no
spanning-tree’ is to disable MSTP.
Command mode: Global Mode and Interface Mode
Default: MSTP is not enabled by default.
Usage Guide: If the MSTP is enabled in global mode, the MSTP is enabled in all the ports
except for the ports which are set to disable the MSTP explicitly.
Example: Enable the MSTP in global mode, and disable the MSTP in the interface 0/0/2.
Switch(Config)#spanning-tree
Switch(Config)#interface ethernet 0/0/2
Switch(Config-Ethernet0/0/2)#no spanning-tree
10.2.2.7 spanning-tree forward-time
Command: spanning-tree forward-time <time>
no spanning-tree forward-time
Function: Set the switch forward delay time; The command ‘no spanning-tree
forward-time’ restores the default setting.
Parameter: <time> is forward delay time in seconds. The valid range is from 4 to 30.
Command mode: Global Mode
Default: The forward delay time is 15 seconds by default.
Usage Guide: When the network topology changes, the status of the port is changed from
blocking to forwarding. This delay is called the forward delay. The forward delay is co
working with hello time and max age. The parameters should meet the following
conditions. Otherwise, the MSTP may work incorrectly.
2 * (Bridge_Forward_Delay - 1.0 seconds) >= Bridge_Max_Age
Bridge_Max_Age >= 2 * (Bridge_Hello_Time + 1.0 seconds)
Example: In global mode, set MSTP forward delay time to 20 seconds.
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