Planet Networking & Communication LRP-1622CS, Руководство пользователя, Страница: 143 / 350

User’s Manual of LRP-822CS/LRP-1622CS
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 From learning to forwarding or to disabled
 From forwarding to disabled
 From disabled to blocking
Figure 4-6-1
STP Port State Transitions
rly
2. STP Parameters
he switch level forms a spanning tree
ore
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 prope
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 Operation Levels
The Switch allows for two levels of operation: the switch level and the port level. T
consisting of links between one or more switches. The port level constructs a spanning tree consisting of groups of one or m
ports. The STP operates in much the same way for both levels.
On the switch level, STP calculates the Bridge Identifier for each switch and then sets the Root
Bridge and the Designated Bridges. On the port level, STP sets the Root Port and the Designated
Ports.