Westermo MRI-128-F4G-PSE24 - Manual (Page 76)

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reconfigure itself as a root bridge. Once two or more devices on the network are
recognized as a root bridge, the devices will renegotiate to set up a new spanning
tree topology.
Hello Time (1-10): Enter a value from 1 to 10 seconds here. This is a periodic
timer that drives the switch to send out BPDU (Bridge Protocol Data Unit) packet
to check current STP status.
The root bridge of the spanning tree topology periodically sends out a “hello”
message to other devices on the network to check if the topology is “healthy”.
The “hello time” is the amount of time the root has waited during sending hello
messages.
Forward Delay Time (4-30): Enter a value between 4 and 30 seconds. This value
is the time that a port waits before changing from Spanning Tree Protocol
learning and listening states to forwarding state.
This is the amount of time the switch will wait before checking to see if it should
be changed to a different state.
Once you have completed your configuration, click on Apply to apply your
settings.
Note: You must observe the following rule to configure Hello Time, Forwarding
Delay, and Max Age parameter
2 × (Forward Delay Time – 1 sec) ≥ Max Age Time ≥ 2 × (Hello Time value + 1
sec)
Port Configuration
Select the port you want to configure and you will be able to view current
settings and status of the port.
Path Cost: Enter a number between 1 and 200,000,000. This value represents the