Graco GE-DS-242-POE Manual De Usuario

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Chapter 4: Web-Based Management 
72 
GE-DS-242-PoE Managed Ethernet Switch User Manual 
Figure 4-33: STP Port State Transitions 
 
You can modify each port state by using management software. When you enable 
STP, every port on every switch in the network goes through the blocking state and 
then transitions through the states of listening and learning at power up. If properly 
configured, each port stabilizes to the forwarding or blocking state. No packets 
(except BPDUs) are forwarded from, or received by, STP enabled ports until the 
forwarding state is enabled for that port. 
STP Parameters 
STP Operation Levels 
The Switch allows for two levels of operation: the switch level and the port level. The 
switch level forms a spanning tree consisting of links between one or more switches. 
The port level constructs a spanning tree consisting of groups of one or more ports. 
The STP operates in much the same way for both levels.