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User’s Manual of ISW-1022M Series and ISW-1033MT
A port transitions from one state to another as follows:
„
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
Switch
Blocking
Listening
Disable
Learning
Forwarding
Figure 5-38 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.
5.6.2.2 RSTP Parameters
RSTP 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 RSTP operates in much the same way for both levels.
On the switch level, RSTP calculates the Bridge Identifier for each switch and then sets the Root
Bridge and the Designated Bridges.
On the port level, RSTP sets the Root Port and the Designated Ports.
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