Specifications

Operations Manual
85
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.
Received BPDUs will be submitted for transmission. They will also be
processed as required by the STP algorithm.
Disabled. Disabled indicates a port that is NOT PARTICIPATING in frame
relay. Nor is it participating in the operation of the STP algorithm and
protocol.
Received frames are discarded. Submitted frames are not forwarded for
transmission.
Disabled is left when the port is enabled by management action and the
blocking state is entered.