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This article provides brief information on high number number of reported discards, errors and interface statistics on a monitored interface within Orion.
All NPM versions
An interface discard is simply where the device has decided to discard a packet for some reason. The reason a device discards the packet(s) is typically hard to tell. It could be a corrupt packet, that the device is busy, buffer overflows, packet size issues, and several other things. The Orion Network Performance Monitor pulls the discard information reported within Orion in the RFC1213:IfTable, more specifically IfInDiscards and IfOutDiscards. These are the OIDs for IfInDiscards and IfOutDiscards:
OID = ifInDiscards 1.3.6.1.2.1.2.2.1.13.
OID = ifOutDiscards 1.3.6.1.2.1.2.2.1.19
The full table of interface statistics and errors OID's are:
| ifInNUcastPkts (.1.3.6.1.2.1.2.2.1.12) | These are counts of inbound broadcast and multicast packets. |
| ifInDiscards (.1.3.6.1.2.1.2.2.1.13) | These are counted as no buffers as reflected in the show interfaces command. |
| ifInErrors (.1.3.6.1.2.1.2.2.1.14) | These are counts of all input errors as reflected in the show interfaces command. |
| ifInUnknownProtos (.1.3.6.1.2.1.2.2.1.15) | These are counted as unclassified errors. |
| ifOutOctets (.1.3.6.1.2.1.2.2.1.16) | These are counts of the number of bytes output by the interface as shown in the show interfaces command. |
| ifOutUcastPkts (.1.3.6.1.2.1.2.2.1.17) | These are counts of outbound broadcast and multicast packets. |
| ifOutDiscards (.1.3.6.1.2.1.2.2.1.19) | These are counted as output drops as shown in the show interfaces command. |
| ifOutErrors (.1.3.6.1.2.1.2.2.1.20) | These are counted as output errors as shown in the show interfaces command. |
| ifOutQLen (.1.3.6.1.2.1.2.2.1.21) | This is the number of packets allowed to be on the output queue as shown in the show interfaces command. |