ifInOctets - Correct Conversion for snmp+cisco bandwidth monitoring

[treyh]

Hello Everyone,

I recently changed jobs and am using zabbix again. I am running freebsd 7.0 and have zabbix correctly pulling snmp info from a cisco switch.

I first tested with this (interface 500 is a vlan interface):
snmpwalk -v 1 -c public 10.0.5.1 1.3.6.1.2.1.2.2.1.10.500
IF-MIB::ifInOctets.500 = Counter32: 40709544
IF-MIB::ifInOctets.500 = Counter32: 40716250
IF-MIB::ifInOctets.500 = Counter32: 40718023
(as you can see, ran it 3 different times and the counter is increasing)

I Created a new item with the following settings:
Description: ifInOctets500
Type: SNMPV1 Agent
SNMP Community: public
SNMP OID: 1.3.6.1.2.1.2.2.1.10.500
SNMP Port: 161
Key: ifInOctets500
Type of Information: Numeric (float)
Units: bps
Use Multiplier: custom multiplier
Custom Multiplier: 8
Update interval: 15
Store Value: Delta (speed per second)
All other settings are default.

When I look at latest data, it shows 0bps. When units was set to nothing, and store value: as is, it pulled numbers like: 40709544

I want to be able to monitor how much bandwidth is passing through the interface in either megabits or kilabits.

[treyh]

found some help

found these settings on the wiki:snmp section:
http://www.zabbix.com/wiki/doku.php?id=contrib:snmp

#
Create an Item

*
Description: server1.example.org (I use DNS names for description YMMV)
*
Type: SNMPv1 agent
*
SNMP community: public
*
SNMP OID: 1.3.6.1.2.1.2.2.1.10.2
*
SNMP port: 161
*
Key: ifInOctets.eth0 (or any other unique value for this item - I use the SNMP name
*
Type of information: Numeric Integer (64bit)
*
Units: bps # bits per second - refer to the ZABBIX Manual and forums for more units
*
Use multiplier || Custom multiplier: 8 # it’s octets so let’s try 8 - someone please explain this
*
Status: Active
*
Store value: Delta Speed per second # Traffic is at most times defined to be just a growing value, we want to see what happens not Gigabyte counting


but even after changing just the 1 setting i had off, from float to numeric 64, still shows 0bps

[mdouhan]

use snmpv2

Hey

Use snmpv2 instead for cisco

and use the following instead of the OID

IF-MIB::ifInOctets.90

in the key field use this

ifInOctets.90

again where 90 is the ifindex of your router interface

Please remember to configure snmp-server ifindex persist or your ifindexes might change after a reboot

where 90 is the ifindex of your router interface you can find it using snmpwalk on your router,

NOTE: if you use high speed interfaces like gig eth or similar you must use the 64 but counters ifHCInOctets otherwise your graphs will have gaps in them because the 32 bot counters wrap to quick.