The FDDI Station Link entity is a subentity of the FDDI Station entity. The FDDI Station link subentity provides the management view of LLC and the FDDI MAC. FDDI allows stations to be either single MAC or dual MAC and therefore there can be up to two link subentities for each station. In most cases, a station has at least one link entity. Concentrators may have no link entity and are not addressable on the FDDI, though they may be using other communications channels.
1 – character
LINK ADDRESS
MAC address assigned during manufacture of the communication
hardware that is associated with the station read-only.
REQUESTED TRT
Default: None Value: 8
Requested token rotation timer.
RESTRICTED TOKEN TIMEOUT
Default: None Value: 1000
Length limit of a restricted token dialog.
RING PURGER ENABLE
Default: None Value: Boolean
Controls whether this station is eligible to be a ring purger and
should participate in the ring purger election.
VALID TRANSMISSION TIME
Default: None Value: 3.4
Valid transmission time.
2 – counters
BLOCK CHECK ERRORS
Number of times a received frame containing an integral number of
octets failed the FCS check.
DIRECTED BEACONS RECEIVED
Number of times the link detected the directed beacon process.
DUPLICATE ADDRESS TEST FAILURES
Number of times the duplicate address test failed detected that the
link address was a duplicate.
DUPLICATE TOKENS DETECTED
Number of times the MAC address test failed detected that the link
address was a duplicate.
ERROR COUNT
Total number of frames that were in error with the E indicator
reset, indicating that the error occurred between the upstream
MAC and this one.
FCI STRIP ERRORS
Number of times a frame content independent strip operation bridge
strip was terminated by receipt of a token.
FRAME COUNT
Total number of frames seen by this link, other than tokens.
FRAME STATUS ERRORS
Number of times a received frame had the E indicator in error
missing or set and the FCS was correct.
LOST COUNT
Counter lost count.
MULTICAST OCTETS RECEIVED
Number of multicast data octets that were successfully received in
multicast frames of type LLC, implementer, reserved, or SMT. The
count does not include the MAC envelope.
MULTICAST OCTETS SENT
Number of multicast data octets that were successfully sent in
multicast frames ot type LLC, implementer, reserved, or SMT.
The count does not include the MAC envelope.
MULTICAST PDUS RECEIVED
Number of multicast frames that were successfully received of type
LLC, implementer, reserved, or SMT.
MULTICAST PDUS SENT
Number of multicast frames that were successfully sent of type LLC,
implementer, reserved, or SMT.
OCTETS RECEIVED
Number of octets successfully received in frames of type LLC,
implementer, reserved, or SMT. The count does not include the MAC
envelope.
OCTETS SENT
Number of octets successfully sent in frames of type LLC,
implementer, reserved, or SMT. The count does not include the MAC
envelope.
PDU LENGTH ERRORS
Number of times a received frame had an invalid length, either too
long or short for the type, or had an alignment error odd number of
symbols.
PDUS RECEIVED
Number of frames successfully received in frames of type LLC,
implementer, reserved, or SMT.
PDUS SENT
Number of frames successfully sent in frames of type LLC,
implementer, reserved, or SMT.
RECEIVE DATA OVERRUNS
Number of times the hardware lost one or more consecutive, only
partially complete incoming frames because it was unable to keep up
with the medium rate. An example is overrun of a bit or octet FIFO
queue because of inability to copy data from adapter to host
promptly. In conjunction with total frames received, provides a
measure of hardware resource and bandwidth failures.
RING BEACONS INITIATED
Number of times the ring beacon process was initiated by this link.
RING INITIALIZATIONS INITIATED
Number of times a ring reinitialization was initiated by this link.
RING INITIALIZATIONS RECEIVED
Number of times a ring reinitialization was initiated by some other
link.
RING PURGE ERRORS
Number of times the ring purger received a token while still in the
ring purge state.
TOKEN COUNT
Number of times a token has been seen by this link.
TRACES INITIATED
Number of times the pc_trace process was initiated by this link.
TRANSMIT FAILURES
Number of times a transmit error, other than underrun, occurred.
This does not include errors in transmitting MAC type frames.
TRANSMIT UNDERRUNS
Number of times a transmit underrun occurred. This indicates the
transmit FIFO became empty during frame transmission.
UNAVAILABLE LINK BUFFERS
Number of times a complete, fully received frame was discarded
because no link buffer was available. In conjunction with total
frames received, provides a measure of station-buffer-related
receive problems.
UNAVAILABLE USER BUFFERS
Number of times no user buffer was available for an incoming frame
that passed all filtering for the port. These are the buffers
supplied by users on receive requests. In conjunction with total
frames received, provides a measure of user-buffer-related receive
problems.
UNRECOGNIZED INDIVIDUAL DESTINATION PDUS
Number of times a received LLC frame with an individual destination
MAC address was discarded because there was no port with the
Ethernet protocol type, SNAP protocol identifier, or LLC SAP
address enabled. Only frames containing individual destination MAC
addresses are counted.
UNRECOGNIZED MULTICAST DESTINATION PDUS
Number of times a received LLC frame with a multicast destination
MAC address was discarded because there was no port with the
Ethernet protocol type, SNAP protocol identifier, or LLC SAP
address enabled. Only frames containing multicast destination
MAC addresses are counted.
3 – status
DOWNSTREAM NEIGHBOR
MAC address of the downstream neighbor, if known.
DUPLICATE ADDRESS FLAG
Summary output of the duplicate address test algorithm.
FRAME STRIP MODE
Current frame stripping mode of the MAC.
SA MATCH - Source address match mode of the frame stripping
algorithm matches the source address of the frame
with the MAC's MyLongAddress MLA, and if a match
is found, the frame is removed from the token ring.
FCI STRIP - The FCIS mode counts the number of frames
transmitted since the reception of a token, and
strips equal number of frames.
LOOPBACK
This is true if the link has been set up to receive frames
transmitted by it. This allows loopback testing either on the
ring or with one of the PHY port loopback modes.
NEGOTIATED TRT
Negotiated token rotation timer.
OLD DOWNSTREAM NEIGHBOR
Previous value of the downstream neighbor.
OLD UPSTREAM NEIGHBOR
Previous value of the upstream neighbor.
RING ERROR REASON
Reason code for the most recent link error.
DIRECTED BEACON RECEIVED - Link received particular beacon data.
DUPLICATE ADDRESS DETECTED - Duplicate address algorithm detected a
duplicate address.
DUPLICATE TOKEN DETECTED - A duplicate token was detected on the
ring.
FCI STRIP ERROR - Frame content independent strip
operation was terminated by the
receipt of a token.
NO ERROR - No errors have occurred on this ring.
PC TRACE INITIATED - PC-trace was initiated by this link.
PC TRACE RECEIVED - PC-trace was initiated by some other
link.
RING BEACONING INITIATED - Ring beaconing process was initiated by
this link. This process in initiated as
a result of serious ring failure, such
as loss of signal or jabbering station
transmitting in violation of the
protocol. This indicates to other
links on the LAN that corrective action
may be required.
RING INIT INITIATED - Ring initialization was initiated by
this link to initialize the ring and
create a token.
RING INIT RECEIVED - Ring initialization was initiated by
some other link to initialize the ring
and create a token.
RING OP OSCILLATION - Ring state has been continually changing
from operational to initializing.
RING PURGE ERROR - Link received a token while performing a
ring purge operation.
RING LATENCY
Current ring latency as measured by this link entity.
RING PURGER STATE
State of the ring purger election process.
CANDIDATE - The Link's Ring Purger process is participating in the
Ring Purger election algorithm as a candidate to become
the Ring Purger.
NONPURGER - The Link's Ring Purger process is in an idle state
listening for periodic Purger Hello frames.
OFF - The Link's Ring Purger process is disabled.
PURGER - The Link's Ring Purger process is performing the
function of removing no owner frames and duplicate
token from the ring. In this state, the process
transmits periodic Purger Hello frames.
STATE
State of the link entity.
BROKEN - Attempt to turn the link on failed the
initialization test, or link was on, but
failure was detected.
OFF-READY - FDDI Data Link communication services are not
available.
ON-RING INIT - Physical layer service is available and the
link entity enabled.
ON-RING RUN - Link detected that the Ring Initialization has
been successfully completed and the ring is
operational.
OFF-FAULT RECOVERY - State entered when a link entity detects
conditions that indicate faulty ring.
UPSTREAM NEIGHBOR ADDRESS
MAC address of the upstream neighbor, if known.
UPSTREAM NEIGHBOR DUPLICATE ADDRESS FLAG
Upstream neighbor's reported result of its duplicate address test.