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8-14 CHAPTER 8: ADMINISTERING FDDI RESOURCES
Frame Processing and
FDDI MAC Statistics
All frames on the FDDI network are received promiscuously by an FDDI
MAC. However, a frame might be discarded for the following reasons:
■ There is no buffer space available.
■ The frame is in error.
tvxCapab Maximum time value of the valid transmission timer that this MAC
can support
tvxExpiredCount Number of times that this MAC’s valid transmission timer has
expired
tvxValue Value of the valid transmission timer in use by this MAC
txByteRate Average number of bytes transmitted per second by this MAC
during the most recent sampling period
txBytes Number of bytes transmitted by this MAC, including framing
characters
txDiscards Number of frames discarded because LLC Service was not enabled
or the FDDI ring was not operational
txFrameRate Average number of frames transmitted per second by this MAC
during the most recent sampling period
txFrames Number of frames transmitted by this MAC. (Note that this
number does not include MAC frames.)
txInternalErrs Number of frames discarded because of an internal hardware
error during transmission
txMulticasts Number of multicast frames queued for transmission by a
higher-level protocol or application, including frames not
transmitted successfully
txPeakByteRate Peak value of fddiMACByteTransmitRate for this MAC since the
station was last initialized
txPeakFrameRate Peak value of fddiMACFrameTransmitRate for this MAC since the
station was last initialized
txQOverflows Number of frames discarded because the transmit queue was full
txUnicasts Number of unicast frames queued for transmission by a
higher-level protocol or application, including frames not
transmitted successfully
upstream MAC address of this MAC’s upstream neighbor
upstreamDupAddr Indicates whether the address upstream of this address is
duplicated on the ring
Table 8-4 Description of Fields for FDDI MAC Attributes (continued)
Field Description