The Configuration Window 3-3FDDI Applications
The FDDI ConÞguration window displays the following Þelds:
MAC State
This Þeld indicates the current state of the MAC on the FDDI ring associated with
the selected SMT entity. The RMT component of SMT monitors MAC operation
and takes actions necessary to aid in achieving an operational ring. RMT occurs
on a per-MAC basis and aids in the detection and resolution of failures, such as
stuck beaconing and the presence of duplicate addresses.
¥Not AvailableÑthere is no MAC on the FDDI ring associated with this SMT
entity, or the selected SMT entity is not attached to the main ring through the
backplane FNB A and B ports.
¥Ring-OpÑthe ring is functioning normally. While in this state, the MAC being
managed is part of an operational FDDI ring.
¥IsolatedÑthe SMT has just initialized RMT or RMT has entered this state
during a path test (trace) after ring beaconing; RMT is not aware of the ring
path or state.
¥Non-OpÑthe MAC being managed by the selected SMT is participating in
ring recovery; the ring is not operational.
¥DetectÑthe claim (beacon) process of the FDDI ring protocol has exceeded
one second. In this state, the ring is still alive, but no data is being transmitted.
This may indicate a problem on the ring, including the detection of duplicate
address conditions.
¥Non-Op-DupÑthe ring is not operational; the address of the MAC under the
control of the SMT entity is a duplicate of another MAC on the ring. The
duplicate address condition prevented ring recovery and initialization after a
claim and beacon process. This state will not occur unless you are using
locally-administered addresses, as factory-set MAC addresses are unique.
¥Ring-Op-DupÑthe ring is operational; however, the address of the MAC
under control of the SMT entity has been found to be a duplicate of another
MAC on the ring. Corrective actions will be attempted before the duplicate
address condition causes ring initialization to fail after the claim and beacon
recovery process. Like Non-Op-Dup, this state will not occur unless you are
using locally-administered addresses.
¥DirectedÑthe beacon process did not complete within 7 seconds. The selected
SMT has directed the controlled MAC to send beacon frames to notify the
other stations that a serious problem exists on the ring, and a Trace state is soon
to follow.
¥TraceÑa problem exists on the ring which could not be corrected during the
beaconing process, and a Trace has been initiated. During a Trace (or Path
Test), the SMT sends a signal that forces its nearest upstream neighbor to
remove from the ring and conduct a self-test. If the ring does not recover, each
subsequent upstream station will be forced to remove from the ring and
conduct self-tests until the problem has been corrected. While the test is being
conducted, ring management re-enters the isolated state.