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What is the typical cause of a high number of i/f discards

I am seeing a high number of  discards reported on one of my monitored WAn rtr (3845). Solarwinds Orion  NPM is reporting a steady flow of error on two links, but not all links. What is the typical cause of these reported discards? I see no  error or counter increases in the >sh int xx; where xx is the  interface shown in the solarwinds reports

Google tells me that

"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 we use to gather this

Interface Errors and Discards:

  OID = ifInDiscards  1.3.6.1.2.1.2.2.1.13.

  0

  OID = ifInErrors 1.3.6.1.2.1.2.2.1.14.

  0

  OID = ifOutDiscards  1.3.6.1.2.1.2.2.1.19.

  increasing on two interfaces but not on any others

  OID = ifOutErrors  1.3.6.1.2.1.2.2.1.20

  0

there are no error and only the outgoing direction has discards

How do i debug this more or get more info on how to track down the root cause?

please advise

Everyone's tags (4)
2 REPLIES 2
Beginner

What is the typical cause of a high number of i/f discards

I just installed NPM and am seeing the same issue on our BGP interfaces to our external provider.

Engager

Re: What is the typical cause of a high number of i/f discards

I too have this in Orion NPM, even on the LAN, 3750X. I was told by Cisco that it is a 'cosmetic bug'

Sent from Cisco Technical Support iPhone App

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