PLANET WGSW-52040 - Manual (Page 335)

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19.1.15 spanning-tree maxage
Command:
spanning-tree maxage <time>
no spanning-tree maxage
Function:
Set the max aging time for BPDU; the command “no spanning-tree maxage” restores the default setting.
Parameter:
<time> is max aging time in seconds. The valid range is from 6 to 40.
Command mode:
Global Mode
Default:
The max age is 20 seconds by default.
Usage Guide:
The lifetime of BPDU is called max age time. The max age is co working with hello time and forward delay. 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 max age time to 25 seconds.
Switch(config)#spanning-tree maxage 25
19.1.16 spanning-tree max-hop
Command:
spanning-tree max-hop <hop-count>
no spanning-tree max-hop
Function:
Set maximum hops of BPDU in the MSTP region; the command “no spanning-tree max-hop” restores the default
setting.