Enterasys Networks 6000 - Manual (Page 195)

FDDI Management
6-4 Viewing FDDI Information
beacon process. This state will not occur unless you are using
locally-administered addresses, as factory-set MAC addresses
are guaranteed to be unique.
Ring-Op-Dup The ring is operational; however, the address of the
MAC under control of the SMT entity has been
found to duplicate that 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.
Directed The 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.
Trace A 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.
SMT Version
Displays the version number of the Station Management (SMT) entity. SMT provides the
system management services for the FDDI protocols, including connection management,
node configuration, error recovery, and management frame encoding. SMT frames have a
version ID field that identifies the structure of the SMT frame Info field. The version
number is included in the SMT frame so that a receiving station can determine whether or
not its SMT version is able to communicate with the SMT version of another station.
Knowing the version number allows the stations to handle version mismatches. Each
FDDI station supports a range of SMT versions. The supported version range is identified
within the ietf-fddi MIB by two smtTable attributes: snmpFddiSMTLoVersionId and
snmpFddiSMTHiVersionId. If a received frame is not within the supported version range,
the frame is discarded.
T-Req. (Requested Target Token Rotation Time)
The token rotation time bid made by the selected SMT entity during ring initialization.
Each station detecting that the ring must be initialized begins a claim token process and
issues a stream of Claim Frames, which negotiate the value assigned to the Target Token
Rotation Time (TTRT). The information field of these frames contains the issuing
station’s bid for the value of TTRT. Each claiming station inspects incoming Claim