System information

INS_CNGE2FE8MSPOE+_REV–
12/20/12 PAGE 47
INSTALLATION AND OPERATION MANUAL CNGE2FE8MSPOE+
TECH SUPPORT: 1.888.678.9427
MSTP
Multiple Spanning Tree Protocol (MSTP) is a standard protocol base on IEEE 802.1s. The
function is that several VLANs can be mapped to a reduced number of spanning tree instances
because most networks do not need more than a few logical topologies. It supports load-
balancing schemes and the CPU is sparer than PVST (Cisco proprietary technology).
MSTP Setting interface
Label Description
MSTP Enable Enable/disable MSTP function to configure the related parameters.
Force Version The Force Version parameter can be used to force a VLAN Bridge that supports
RSTP to operate in an STP-compatible manner.
Configuration Name The same MST Region must have the same MST configuration name.
Revision Level (0-65535) The same MST Region must have the same revision level.
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
reboot the switch. The value must be a multiple of 4096 according to the protocol
standard rule.
Max Age Time(6-40) Time, in seconds, a bridge will wait to receive Spanning-tree Protocol configuration
messages before attempting a reconfiguration. Enter a value 6 through 40.
Hello Time (1-10) Follow the rule below to configure the MAX Age, Hello Time, and Forward Delay
Time a controlled switch sends out the BPDU packet to check RSTP current status.
Enter a value between 1 through 10.
2 x (Forward Delay Time value –1) ≥ Max Age value ≥ 2 x (Hello Time value +1)
Forwarding Delay Time
(4-30)
Time, in seconds, a port will wait before changing from its Rapid Spanning-Tree
Protocol learning and listening states to the forwarding state. Enter a value 4
through 30.
Max Hops (1-40) This parameter is additional to those specified for RSTP. A single value applies
to all Spanning Trees within an MST Region (the CIST and all MSTIs) for that the
Bridge is the Regional Root.
Apply Select Apply to activate the configurations.