Web application
PROmesh P9+
– User Manual
36
Bridge priority: This value is used for negotiating the root bridge. The bridge with the lowest value
has the highest priority and is chosen as the root bridge. The value must be between 0 and
61440 and a multiple of 4096.
Hello Time: The time interval at which the switch sends BPDU (Bridge Protocol Data Unit)
packets to check the current status of the RSTP. Enter a value between 1 and 10 seconds.
TX hold count: Specifies the maximum number of Hello packets transmitted within an interval. A
minimum of 1 and a maximum of 10 packets are allowed.
Figure 16: Device settings RSTP
Notice: Follow the rule to configure Forward Delay, Maximum Age and Hello Time:
2 * (Forward Delay Time
– 1) >= MaxAge >= 2 * (Hello Time + 1).
Recommended procedure: Select a value for “Hello Time” and calculate with the formula 2 * (Hello Time +
1) in accordance with the rule given above to get the lower limit of the Maximum Age. Select a value for
“Forward Delay Time” and use the formula 2 * (Forward Delay Time – 1) of the above rule to calculate the
upper limit of the Maximum Age. Then select a Maximum Age between 6 and 40 seconds, which lies
between the previously calculated limits.
When you have set the parameters, click “Apply” to apply the changes. The root bridge information is now
displayed at the top of the page.