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Token Ring Statistics
Transmitted Beacons
Beacon frames are transmitted by ring stations when certain error conditions are
detected. These frames notify all ring stations that there is a problem, and causes
the stations in the fault domain (the beaconing station and its NAUN) to remove
themselves from the ring and perform a loopback test. If either station fails the
test, its removal should allow the ring to recover.
Recoveries
Indicates that claim tokens have been detected on the ring. Claim token frames
are issued during the active monitor contention process; their presence on the
ring indicates that the ring is recovering from the loss of the active monitor. This
counter is reset once the new active monitor is chosen and issues a ring purge to
reset the ring.
Lobe Wire Fault
Indicates that a station on the ring has detected a short or open condition on its
lobe wires. This condition is detected by the loss of the phantom current. A station
detecting this condition will remove itself from the ring.
Remove Frames
Indicates that a Remove MAC frame has been detected on the ring. A Remove
MAC frame forces the receiving station to remove itself from the ring. Once a
station has removed itself from the ring, its actions will depend upon its design:
some devices will automatically try to re-insert after a pre-determined timeout
period; as part of the re-insertion process, those devices will perform a loopback
test to verify that their MAC adapters are operating properly. Stations which do
not automatically attempt re-insertion will simply remain off the ring until they
are manually re-inserted.
Auto Removes
Indicates that one or more stations has failed a loopback test performed as a result
of a beaconing condition, and has therefore removed itself from the ring.
Single Station
This condition indicates that the management station has determined that it is the
only station on the ring.
Hard Errors
If the management station has detected hard errors on the ring, this field will
display "Detected." If no hard errors were detected, this field will display
"None."
3-18
Management Station Statistics
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