PLANET XGS3-24042 - Manual (Page 259)

14-105
When the AUTO format is set, and over one equipment which is not compatible with each other are
connected on the port (e.g. a equipment running through a HUB or Transparent Transmission
BPDU is connected with several equipments running MSTP), the format alter counts will be
recorded and the port will be disabled at certain count threshold. The port can only be re-enabled by
the administrator.
Example:
Configure port message format as the message format of IEEE.
Switch(config)#interface ethernet 1/0/2
Switch(Config-If-Ethernet1/0/2)#spanning-tree format standard
Switch(Config-If-Ethernet1/0/2)#
14.1.12 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.
Switch(config)#spanning-tree forward-time 20
14.1.13 spanning-tree hello-time