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Checking Port Activity
4-9
Averaging: Display Field. This field displays whether the
averaging feature has been turned on or off . If it is on , the
number of packets or bytes displayed on this screen reflect
averages per second. If it is off , the screen displays the numbers
of packets or bytes accumulated since power-up.
This feature is set on the System Information screen. The default is
on .
Port State: Display Field. Displays the ports and their present
state. The possible states are MOS , Forwarding , Blocking ,
Listening and Learning .
The external port may go into a disconnected state ( DCONN ) when
a segment has not been attached, or a transceiver module is not
fitted.
MOS (Manually Out of Service) means that the port has been
manually disabled by a bridge administrator. No network traffic
passes through it.
Forwarding means that the port is bridging packets and
spanning tree calculations. All root ports and designated ports are
in forwarding state, and these are the only ports that are ever in
the forwarding state. If one bridge receives information from
another bridge indicating that one of its ports should not be a
root bridge or a designated port, that port is placed in the
blocked state.
Blocking means that the port does not forward packets but is
included in the spanning tree calculations. Ports enter the
blocking state by a network administrator who enables a disabled
port, or when spanning tree determines that the port creates an
active loop in the network.
DUA1860-0AAA01
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