Ethernet Administration
46
This screen shows the status and configuration of each Ethernet port. At the
top of the screen, you see the system name (if any). Each port is identified by
number and name (if any).
The columns provide the following information:
Port.
The
Port
column shows each port number and its user-assigned name,
if any.
Link.
The
Link
column shows the status of each port’s Link Integrity Test:
either
Online
or
Offline
.
Online
indicates that IEEE 10BASE-T standard Link Integrity
pulses have been detected on this port.
Offline
indicates that Link Integrity pulses have not been detected.
Either the device is not operational (powered down, etc.), or there is a
physical problem with the wiring.
“- -” indicates that Link Integrity Tests are not to be performed on
this port — Link Test has been turned OFF by the management
agent.
Status.
There are five possible states:
Enabled (Blocking, Listening,
Learning, Forwarding)
and
Disabled
Enabled
indicates a port that is currently forwarding frames — a ready (but
not necessarily currently active) — port. All received frames are discarded
and additional stations are not added to the filtering database.
A port enters the blocking state because it has received information that
another bridge is the designated bridge for the LAN to which the port is
attached.
Blocking
indicates a port that is NOT PARTICIPATING in
forwarding frames thusly preventing the creation of multiple topology
paths. Received frames are discarded and frames are not submitted
for transmission. Station locations are not added to the database.
Listening
A port in this state is PREPARING TO PARTICIPATE
in frame relay but is temporarily disabled to prevent temporary loops.
Learning is disabled since changes in the active topology may lead to
incorrect information when the active topology becomes stable.
Received frames are discarded and frames are not submitted for
transmission. Station location information is not added to the
database
Learning
indicates a port is PREPARING TO PARTICIPATE in
frame relay but it is temporarily disabled in order to prevent
temporary loops. Learning is enabled to allow information to be
acquired prior to frame relay in order to reduce the number of frames
unnecessarily relayed.
Received frames are discarded and frames are not submitted for
transmission. Station location information is added to the database.
Forwarding
indicates a port that is PARTICIPATING in frame
relay. It is both forwarding and submitting frames. The learning
process incorporates station location information into the filtering
database.
