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Parameter
Type
Status
Designated
Cost
Description
Shows port type as:
100TX
100FX_MM
100FX_SM
1000LX
1000SX
1000T
Displays current state of this port within the Spanning Tree:
Disabled
No link has been established on this port.
Otherwise, the port has been disabled by the
user or has failed diagnostics.
Blocking
Port receives STA configuration messages,
but does not forward packets.
Listening
Port will leave blocking state due to a
topology change, start transmitting
configuration messages, but does not yet
forward packets.
Learning
Port has transmitted configuration messages
for an interval set by the Forward Delay
parameter without receiving contradictory
information. Port address table is cleared,
and the port begins learning addresses.
Forwarding The port forwards packets, and continues
learning addresses.
The rules defining port status are:
• A port on a network segment with no other
STA-compliant bridging device is always forwarding.
• If two ports of a switch are connected to the same
segment and there is no other STA device attached to
this segment, the port with the smaller ID forwards
packets and the other is blocked.
• All ports are blocked when the switch is booted, then
some of them change state to listening, to learning,
and then to forwarding.
The cost for a packet to travel from this port to the root in
the current Spanning Tree configuration. The slower the
media, the higher the cost.
M
ONITORING THE
: 10BASE-T / 100BASE-TX
: 100BASE-FX (multimode)
: 100BASE-FX (singlemode)
: 1000BASE-LX (singlemode)
: 1000BASE-SX (multimode)
: 1000BASE-T
S
WITCH
2-65
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