PLANET WGSW-50040 - Manual (Page 163)

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
9.1.11 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.
Parameter:
<hop-count> sets maximum hops. The valid range is from 1 to 40.
Command mode:
Global Mode
Default:
The max hop is 20 by default.
Usage Guide:
The MSTP uses max-age to count BPDU lifetime. In addition, MSTP also uses max-hop to count
BPDU lifetime. The max-hop is degressive in the network. The BPDU has the max value when it
initiates from MSTI root bridge. Once the BPDU is received, the value of the max-hop is reduced by
1. When a port receives the BPDU with max-hop as 0, it drops this BPDU and sets itself as
designated port to send the BPDU.
Example:
Set max hop to 32.
Switch(config)#spanning-tree max-hop 32
9.1.12 spanning-tree mcheck
Command:
spanning-tree mcheck
Function:
Force the port to run in the MSTP mode.