ifInDiscards - MIB output question.

[brucesheppard]

1.3.6.1.2.1.2.2.1.13 ifInDiscards

"The number of inbound packets which were chosen to be
discarded even though no errors had been detected to prevent
their being deliverable to a higher-layer protocol. One
possible reason for discarding such a packet could be to
free up buffer space.

Discontinuities in the value of this counter can occur at
re-initialization of the management system, and at other
times as indicated by the value of
ifCounterDiscontinuityTime."

Is the output a percentage of drops or simply the actual number of drops ?

[Rolf Fischer · Accepted solution]

It is the number of input drops; basically the equivalent to the value in the 'Input queue' line of 'show interface'

Input queue: 0/75/0/0 (size/max/drops/flushes)

In contrast to the show command output, the SNMP counters are not reset to zero after a 'clear counter'. The object-type is 'counter32', so after reaching the max value of 4,294,967,295 it restarts with 0.

Traffic graph tools typically show the difference of two measuring results per interval on a timeline, which provides information about when the drops/erros occured.

HTH

Rolf