OIB value for Total output drops

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Jun 11th, 2014
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Hi, we have a Cisco C7200P router at work running IOS 12.4(12.2r)T, and we monitor it using Zenoss 3.1. We want to be able to capture the total output drops for a Gigabit Ethernet interface. I created a custom monitoring template and I added the following data source:

Name: cieIfOutputQueueDrops

OIB: 1.3.6.1.4.1.9.9.276.1.1.1.1.11

The total output drops as viewed via the CLI are as follows:

Input queue: 0/75/1335749/399902 (size/max/drops/flushes); Total output drops: 53882894

However the graph on Zenoss reports a completely different value of ~360M. Here is the output of snmpwalk:

SNMPv2-SMI::enterprises.9.9.276.1.1.1.1.11.1 = Counter32: 0 SNMPv2-SMI::enterprises.9.9.276.1.1.1.1.11.2 = Counter32: 0 SNMPv2-SMI::enterprises.9.9.276.1.1.1.1.11.3 = Counter32: 0 SNMPv2-SMI::enterprises.9.9.276.1.1.1.1.11.4 = Counter32: 363270064 SNMPv2-SMI::enterprises.9.9.276.1.1.1.1.11.5 = Counter32: 0 SNMPv2-SMI::enterprises.9.9.276.1.1.1.1.11.6 = Counter32: 0 SNMPv2-SMI::enterprises.9.9.276.1.1.1.1.11.7 = Counter32: 0 SNMPv2-SMI::enterprises.9.9.276.1.1.1.1.11.12 = Counter32: 0 SNMPv2-SMI::enterprises.9.9.276.1.1.1.1.11.13 = Counter32: 0 SNMPv2-SMI::enterprises.9.9.276.1.1.1.1.11.14 = Counter32: 0 SNMPv2-SMI::enterprises.9.9.276.1.1.1.1.11.15 = Counter32: 653008 SNMPv2-SMI::enterprises.9.9.276.1.1.1.1.11.26 = Counter32: 0 SNMPv2-SMI::enterprises.9.9.276.1.1.1.1.11.125 = Counter32: 0 SNMPv2-SMI::enterprises.9.9.276.1.1.1.1.11.139 = Counter32: 0 SNMPv2-SMI::enterprises.9.9.276.1.1.1.1.11.140 = Counter32: 0 SNMPv2-SMI::enterprises.9.9.276.1.1.1.1.11.194 = Counter32: 0 SNMPv2-SMI::enterprises.9.9.276.1.1.1.1.11.196 = Counter32: 0 SNMPv2-SMI::enterprises.9.9.276.1.1.1.1.11.254 = Counter32: 0 SNMPv2-SMI::enterprises.9.9.276.1.1.1.1.11.288 = Counter32: 0
 

The value it retunrs is incorrect. I would appreciate some assistance.

 

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Vinod Arya Sat, 06/14/2014 - 02:35
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  • Cisco Employee,

Did you tried using ifOutDiscards (.1.3.6.1.2.1.2.2.1.19). These are counted as output drops as shown in the show interfaces command.

It shows the number of outbound packets which 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.

For more details on interface couter please check following document :

SNMP Counters: Frequently Asked Questions

-Thanks

Vinod

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