3Com SUPERSTACK II 2000 TR, User Manual

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Port Statistics 6-3
Port Statistics
The TR Port Statistics screen provides an easy method
for viewing individual port performance. See
Figure 6-3. TR Port Statistics provide more detailed
information on individual ports. This screen also pro-
vides access to the Traffic Statistics screen.
To view the TR Port Statistics screen, take these steps
from the Switch 2000 TR Main Menu:
1
Select Switch Management.
The TR Management screen appears.
2
Press [Space Bar] until Port appears.
3
Press [Down Arrow] until Statistics highlights.
4
Press [Return].
The TR Port Statistics screen appears.
Figure 6-3 TR Port Statistics Screen
The TR Port Statistics screen displays this information:
Unit ID — The number of the unit with which the port
is associated.
Port ID — The number of the port you are viewing.
Link State — The current state of the port you are
viewing. The port states are:
■
Listening —The state in which all ports are placed
while Spanning Tree configures the network topol-
ogy. Ports remain in this state until the root bridge
is selected. This period should be long enough for
a port to hear from all other ports on the switch.
■
Learning —The state in which ports receive data
on the topology of the network for the purpose of
learning the stations that are attached to the port.
If the port receives no information that would
force it into the blocking state, then it moves on to
the forwarding state.
■
Forwarding —This state allows the port to per-
form standard switching and bridging functions.
Packets are received and the port either forwards
or discards them based on the address of the
packet and the switch’s address table.
■
Blocking —In this state, the port continues to
receive data on the status of the network topology
but does not transmit them. The port also receives
no packets nor learns the addresses of stations for
forwarding or receiving.
■
Disabled —The state in which Spanning Tree has
been turned off. Port is disabled by management.