System information

INS_CNGE2FE8MSPOE+_REV–
12/20/12 PAGE 44
INSTALLATION AND OPERATION MANUAL CNGE2FE8MSPOE+
TECH SUPPORT: 1.888.678.9427
RSTP
The Rapid Spanning Tree Protocol (RSTP) is an evolution of the Spanning Tree Protocol. It
provides 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 setting
You can enable/disable RSTP function, and set parameters for each port.
RSTP Setting interface
Label Description
RSTP mode You must enable or disable the RSTP function before
configuring the related parameters.
Priority (0-61440) A value used to identify the root bridge. The bridge with the
lowest value has the highest priority and is selected as the
root. If the value changes, You must restart the switch. The
value must be a multiple of 4096 according to the protocol
standard rule.
Max Age Time(6-40) The number of seconds a bridge waits without receiving
Spanning-tree Protocol configuration messages before
attempting a reconfiguration. Enter a value from 6 through
40.
Hello Time (1-10) The time that controls switch sends out the BPDU packet to
check RSTP current status. Enter a value from 1 through 10.
Forwarding 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 from 4 through 30.
Apply Select Apply to activate the configurations.
NOTE: Follow the rule to configure the MAX Age, Hello Time, and Forward Delay Time.
2 × (Forward Delay Time value –1) ≥ Max Age value ≥ 2 × (Hello Time value +1)
View the RSTP algorithm results at this table