inS_cnge2fe16MS_reV–
01/11/12 Page 75
INSTALLATION AND OPERATION MANUAL
CNGE2FE16MS
TECh SUPPORT: 1.888.678.9427
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. Refer to Figure 72.
»
RSTP Mode
: Select the
RSTP Mode
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 admin device. If the value is changed, users must reboot the switch.
Note
the value specified in the Priority 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, select 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)
