Ref: 11640103
Title: PATH Statistics for NetBuilder
Date: 12/31/90

Copyright 3Com Corporation, 1991.  All rights reserved.

Here is a comprehensive explanation of all of the path statistics as
displayed from the NETBuilder.  Below is the actual screen output from a
NetBuilder, followed by the explanations.

[15]Brouter# sh stati -pa
ACCUMULATED VALUES

 Path                              1          2          3          4
 Rcv Good: Packets            209701     200992
           Bytes            61103704   35291029
           Multicast               0          0
           Broadcast          140388     108953
 Rcv Bad : CRC                     0          0
           Framing                 0          0
           Too Long                0          0
           Lost                    0          0
 Xmit Good:Packets            113459      85803
           Bytes            14304761   37774959
           Multicast               0          0
           Broadcast           12290      12320
 Xmit Bad: Deferred             1082       1269
           One Collision        1779         53
           > 1 Collisions       5074         41
           Late Collisions         0          0
           Xcess Collision         0          0
           Carrier Loss            0          0
           Underrun                0          0
 Discard : Buffer Overrun          0          0
           Congestion              0          0

________________________________________________________________________

 Rcv Good: Packets            The number of good packets that were
                              successfully received on the specified
                              interface.
           Bytes              The total number of bytes that have been
                              received on an interface.  This count is
                              inclusive of headers but exclusive of the
                              2 CRC bytes.
           Multicast          The number of good packets that were
                              received and destined to a multicast
                              address.  Broadcast packets are not
                              included in this count.
           Broadcast          The number of good packets that were
                              received and destined to the broadcast
                              address.
 Rcv Bad : CRC                The number of frames that were received,
                              but failed the cyclic redundancy check.
           Framing            The number of frames that were received,
                              but were not on a 16-bit boundary.
           Too Long           The number of frames that were received in
                              excess of 1514 bytes.
           Lost               The number of receptions that were aborted
                              because the CPU could not provide the
                              controller chip with memory fast enough.
 Xmit Good:Packets            The number of frames have been
                              successfully transmitted from an
                              interface.
           Bytes              The number of bytes that have been
                              successfully transmitted from an
                              interface.  This count includes headers
                              but excludes the 2 CRC bytes.
           Multicast          The number of frames that have been
                              transmitted to a multicast address.
                              Broadcast packets are not included in this
                              count.
           Broadcast          The number of frames that have been
                              transmitted to the broadcast address.
 Xmit Bad: Deferred           The number of frames that could not be
                              transmitted due existing traffic on the
                              link.  Transmission would have resulted in
                              a collision.  A later attempt was made to
                              transmit this frame.
           One Collision      The number of frames that experienced a
                              collision during the first attempt to
                              transmit.
           > 1 Collisions     The number of frames that experienced a
                              collision during any of the 2nd, 3rd, 4th,
                              ..., 14th, 15th, or 16th attempts at
                              retransmission.
           Late Collisions    The number of frames that received a
                              collision outside of the preamble.
           Xcess Collision    The number of frames that were not
                              transmitted due to 16 consecutive
                              collisions.  These frames were discarded
                              after the controller indicated it failed
                              at the 16 attempts to transmit.
           Carrier Loss       The number of frames that experienced a
                              loss of the carrier signal during
                              transmission.  On Ethernet the transmission
                              of the packet was completed; however, it is
                              unknown if other stations were able to
                              receive the packet correctly due to the
                              loss of the carrier signal.
           Underrun           The number of transmissions that were
                              aborted because the CPU could not provide
                              the controller chip with data fast enough.
 Discard : Buffer Overrun     The number of good frames that were lost
                              due to memory overrun.  The system did not
                              have the memory resources to transfer the
                              packet internally for further processing.
           Congestion         The number of frames that could not be
                              transmitted due to congestion on the
                              data link.  The outbound transmit queue
                              was full and these are the frames that
                              could not be placed in the transmit queue.

