Reference Guide

N8406-022A 1Gb Intelligent L2 Switch Browser-based Interface Reference Guide 54
Interface (“if”) Statistics - Output
The following table describes the interface output statistics of the selected port:
Table 41 Interface Statistics for a Port - Output
Statistic
Description
HC Octets
The total number of octets transmitted out of the interface, including framing characters.
HC UCastPkts
The total number of packets that higher-level protocols requested to be transmitted, and
which were not addressed to a multicast or broadcast address at this sub layer, including
those that were discarded or not sent.
HC BcastPkts
The total number of packets that higher-level protocols requested to be transmitted, and
which were addressed to a broadcast address at this sub layer, including those that were
discarded or not sent. This object is a 64-bit version of ifOutBroadcastPkts
HC MCastPkts
The total number of packets that higher-level protocols requested to be transmitted, and
which were addressed to a multicast address at this sub layer, including those that were
discarded or not sent. For a MAC layer protocol, this includes both Group and Functional
addresses. This object is a 64-bit version of ifOutMulticastPkts.
Discards
The number of outbound packets that were chosen to be discarded even though no errors
had been detected to prevent their being transmitted. One possible reason for discarding
such a packet could be to free up buffer space.
Errors
For packet-oriented interfaces, the number of outbound packets that could not be
transmitted because of errors. For character-oriented or fixed-length interfaces, the number
of outbound transmission units that could not be transmitted because of errors.
Ethernet (“dot3”) Statistics
The following table describes the Ethernet statistics of the selected port:
Table 42 Ethernet Statistics for a Port
Statistic
Description
Align Errors
A count of frames received on a particular interface that is not an integral number of
octets in length and do not pass the Frame Check Sequence (FCS) check.
The count represented by an instance of this object is incremented when the
alignmentError status is returned by the MAC service to the Logical Link
Control (LLC) (or other MAC user). Received frames for which multiple error
conditions obtained are, according to the conventions of IEEE 802.3 Layer
Management, counted exclusively according to the error status presented to the
LLC.
FCS Errors
A count of frames received on a particular interface that is an integral number of
octets in length but do not pass the Frame Check Sequence (FCS) check.
The count represented by an instance of this object is incremented when the
frameCheckError status is returned by the MAC service to the LLC (or other
MAC user). Received frames for which multiple error conditions obtained are,
according to the conventions of IEEE 802.3 Layer Management, counted exclusively
according to the error status presented to the LLC.
Single Collisions
A count of successfully transmitted frames on a particular interface for which
transmission is inhibited by exactly one collision.
A frame that is counted by an instance of this object is also counted by the
corresponding instance of the ifOutUcastPkts, ifOutMulticastPkts, or
ifOutBroadcastPkts, and is not counted by the corresponding instance of the
dot3StatsMultipleCollision-Frame object.
Multi Collisions
A count of successfully transmitted frames on a particular interface for which
transmission is inhibited by more than one collision.
A frame that is counted by an instance of this object is also counted by the
corresponding instance of the ifOutUcastPkts, ifOutMulticastPkts, or
ifOutBroadcastPkts, and is not counted by the corresponding instance of the
dot3StatsSingleCollision-Frames object.
Late Collisions
The number of times that a collision is detected on a particular interface later than
512 bit-times into the transmission of a packet.
Five hundred and twelve bit-times corresponds to 51.2 microseconds on a 10 Mbit/s
system. A (late) collision included in a count represented by an instance of this
object is also considered as a (generic) collision for purposes of other collision-
related statistics.