Planet IGS-801T [70/120] User s manual of igs 801m

User’s Manual of IGS-801M

 Listening – the port is waiting to receive BPDU packets that may tell the port to go back to the blocking state

ut not yet forwarding packets

arding packets

t messages and must return to the blocking state

 From initialization (switch boot) to blocking

 From blocking to listening or to disabled

 From listening to learning or to disabled

 From learning to forwarding or to disabled

 From forwarding to disabled

 From disabled to blocking

 Learning – the port is adding addresses to its forwarding database, b

 Forwarding – the port is forw

 Disabled – the port only responds to network managemen

first

A port transitions from one state to another as follows:

Switch

Blocking

Listening Disable

Learning

Forwarding

Figure 4-6-1 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

ugh the blocking state and then transitions through the states of listening and learning at power up. If

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

network goes thro

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.

2. STP Parameters

STP Operation Levels

more ports. The STP operates in much the same way for both levels.