User manual

Rapid Spanning Tree
The Rapid Spanning Tree Protocol (RSTP) is an evolution of the Spanning Tree Protocol and provides for
faster spanning tree convergence after a topology change. The system also supports STP and the
system will auto-detect the connected device that is running STP or RSTP protocol.
RSTP - System Configuration
•
The user can view spanning tree information of the Root Bridge.
•
The user can modify RSTP state. After modification, click
A
pp
l
y
button.
¾ RSTP mode: The user must enable the RSTP function first before configuring the related
parameters.
¾ Priority (0-61440): The switch with the lowest value has the highest priority and is selected as
the root. If the value is changed, the user must reboot the switch. The value must be a multiple
of 4096 according to the protocol standard rule.
¾ Max Age (6-40): The number of seconds a switch waits without receiving Spanning-tree
Protocol configuration messages before attempting a reconfiguration. Enter a value between 6
through 40.
¾ Hello Time (1-10): The time that controls the switch to send out the BPDU packet to check
RSTP current status. Enter a value between 1 through 10.
¾ Forward Delay Time (4-30): The number of seconds a port waits before changing from its
Rapid Spanning-Tree Protocol learning and listening states to the forwarding state. Enter a
value between 4 through 30.
Note Follow the rule to configure the MAX Age, Hello Time, and Forward Delay
Time.
2 x (Forward Delay Time value –1) > = Max Age value >= 2 x (Hello Time
value +1)
Figure 3.1-28 RSTP System Configuration
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