Lantech LES-2400-RPS, User Manual

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Rapid Spanning Tree
The Rapid Spanning Tree Protocol (RSTP) is an evolution of the Spanning Tree
Protocol providing for faster spanning tree convergence after a topology change. The
system also supports STP and will auto-detect the connected device running STP or
RSTP.
RSTP System Configuration
This tab allows users to configure parameters for RSTP and displays the spanning tree
information of the root bridge.

RSTP mode: Click the pull-down menu to enable the RSTP function.

Priority (0-61440): The switch with the lowest numerical value has the highest
priority and will be selected as the root device. If the value is changed, users must
reboot the switch. Note the value specified in this field must be a multiple of 4096
according to the protocol rule.

Max Age (6-40): Enter the time in seconds between 6 and 40 for which the switch
waits to attempt to save its configuration.

Hello Time (1-10): Enter the time in seconds between 1 and 10 that controls the
switch to send out the BPDU packet to check current states of RSTP.

Forward Delay Time (4-30): Enter the time in seconds between 4 and 30 that a
port spends changing from its learning and listening state to the forwarding state.

When finished, click the Apply button to have the configuration take effect.
[NOTE] Follow the rule below to configure Max Age , Hello Time , and Forward
Delay Time parameters.
2 x (Forward Delay Time value
–1) > = Max Age value >= 2 x (Hello
Time value +1)
Root Bridge Information
The column fields give the current bridge information for the switch.