System information

Troubleshooting FDDI
Book Title
5-78
overrun Number of times the serial receiver hardware was unable to hand received data to a
hardware buffer because the input rate exceeded the receiver’s ability to handle the
data.
ignored Number of received packets ignored by the interface because the interface hardware
ran low on internal buffers. These buffers are different from the system buffers
mentioned previously in the buffer description. Broadcast storms and bursts of noise
can cause the ignored count to be increased.
packets output Total number of messages transmitted by the system.
bytes Total number of bytes, including data and MAC encapsulation, transmitted by the
system.
underruns Number of transmit aborts (when the router cannot feed the transmitter fast enough).
output errors Sum of all errors that prevented the final transmission of datagrams out of the
interface being examined. Note that this might not balance with the sum of the
enumerated output errors because some datagrams can have more than one error and
others can have errors that do not fall into any of the specifically tabulated categories.
collisions Because an FDDI ring cannot have collisions, this statistic is always zero.
interface resets Number of times an interface has been reset. The interface may be reset by the
administrator or automatically when an internal error occurs.
restarts Should always be zero for FDDI interfaces.
output buffer failures Number of no-resource errors received on the output.
output buffers swapped out Number of packets swapped to DRAM.
transitions Number
of times the ring made a transition from ring operational to ring
nonoperational, or vice versa. A large number of transitions indicates a problem with
the ring or the interface.
traces Indicates the number of times this interface started a trace. Trace count applies to both
the FCI, FCIT, and FIP.
claims Pertains to FCIT and FIP only. Indicates the number of times this interface has been
in claim state.
beacons Pertains to FCIT and FIP only. Indicates the number of times the interface has been in
beacon state.
1 CMT = connection management
2 DAS = dual-attachment station
3 SAS = single-attachment station
4 FIP = FDDI processor
Field Description