Read previous value in SNMP trigger

[fdavidcn]

Hi guys! im newbie with zabbix and i have a little question..

Now im getting interface speed of device via SNMP with an associated trigger that alerts me when value changes. At the moment all is good, but i need to show in trigger name/caption what value was before change.

For example, if interface speed changes, im get an alarm that says "Ethernet speed of interface was changed to XXX Mbps"
I want know how can i show previous value before the trigger acts, for example "Ethernet speed of interface was changed from 1Gbps to 100 Mbps"

This is my trigger configuration:
Name: Ethernet speed of interface was changed to ({ITEM.LASTVALUE})
Expression: {templateX:ethernetSpeed.diff()}=1

Thanks!!

[kernbug]

Hi guys! im newbie with zabbix and i have a little question..

Now im getting interface speed of device via SNMP with an associated trigger that alerts me when value changes. At the moment all is good, but i need to show in trigger name/caption what value was before change.

For example, if interface speed changes, im get an alarm that says "Ethernet speed of interface was changed to XXX Mbps"
I want know how can i show previous value before the trigger acts, for example "Ethernet speed of interface was changed from 1Gbps to 100 Mbps"

This is my trigger configuration:
Name: Ethernet speed of interface was changed to ({ITEM.LASTVALUE})
Expression: {templateX:ethernetSpeed.diff()}=1

Thanks!!

Hello

As far as I know from here https://www.zabbix.com/documentation...ers/functions:

item.last(#2) - is the previous value

item.prev() - is the previous value

Example:

({host:item.prev()} # {host:item.last()})

Change {ITEM.LASTVALUE} to 1 and 2:

{ITEM.VALUE[URL="https://www.zabbix.com/documentation/3.0/ru/manual/appendix/macros/supported_by_location#%D0%BD%D1%83%D0%BC%D0%B5%D1%80%D0%BE%D0%B2%D0%B0%D0%BD%D0%BD%D1%8B%D0%B5_%D0%BC%D0%B0%D0%BA%D1%80%D0%BE%D1%81%D1%8B"]<1-9>[/URL]}

from here https://www.zabbix.com/documentation...ed_by_location

[fdavidcn]

Hi kernbug, i was try to change values as you commented but i think that some config is wrong in my config because dont work as i need..

Here is my Item monitor configuration:
- Name: Ethernet Speed
- Type: SNMPv2 Agent
- Monitor: ethernetSpeed
- SNMP OID: .1.3.6.1.2.1.31.1.1.1.15.1
- SNMP Community: {$MYSNMP}
- Information type: Numeric (Integer 64 bits)
- Unit: bps
- Refresh: 10s

And this is Trigger configuration:
- Name: Ethernet speed of interface was changed from {ITEM.VALUE1} to {ITEM.VALUE2}
- Gravity: High
- Expression: {netdevices.switches:ethernetSpeed.last()} <> {netdevices.switches:ethernetSpeed.prev()}=1


I would apreciate any help!
Thanks!

[kernbug]

Hi kernbug, i was try to change values as you commented but i think that some config is wrong in my config because dont work as i need..

Here is my Item monitor configuration:
- Name: Ethernet Speed
- Type: SNMPv2 Agent
- Monitor: ethernetSpeed
- SNMP OID: .1.3.6.1.2.1.31.1.1.1.15.1
- SNMP Community: {$MYSNMP}
- Information type: Numeric (Integer 64 bits)
- Unit: bps
- Refresh: 10s

And this is Trigger configuration:
- Name: Ethernet speed of interface was changed from {ITEM.VALUE1} to {ITEM.VALUE2}
- Gravity: High
- Expression: {netdevices.switches:ethernetSpeed.last()} <> {netdevices.switches:ethernetSpeed.prev()}=1


I would apreciate any help!
Thanks!

"Ethernet speed of interface was changed from {ITEM.VALUE1} to {ITEM.VALUE2}":
Value1 is {netdevices.switches:ethernetSpeed.prev()}
Value2 is {netdevices.switches:ethernetSpeed.last()}
operator is "<>" between value1 and value2

You don't need to compare with '=1'.

[fdavidcn]

Hi again,

I've tried your config but the result is "Ethernet speed of interface was changed from 1Gbps to 1Gbps. ITEM.VALUE1 and 2 have the same value??

This is the trigger config:
Name: Ethernet speed was changed from {ITEM.VALUE2} to {ITEM.VALUE1}
Expression: {netdevices.switches:ethernetSpeed.last()} <> {netdevices.switches:ethernetSpeed.prev()}

Thanks for your help!

[kernbug]

Hi again,

I've tried your config but the result is "Ethernet speed of interface was changed from 1Gbps to 1Gbps. ITEM.VALUE1 and 2 have the same value??

My mistake, as expected it does not work. I checked twice, one item -> one item.value/lastvalue result. Trigger function doesn't matter for item.value(((
In other words you need second item with default port speed from the config of the SNMP device.

[fdavidcn]

Hi kernbug, this are history values at now

1	2018-06-15 16:04:12	100000000	100 Mbps
2	2018-06-15 16:04:02	1000000000	1 Gbps
3	2018-06-15 16:03:52	1000000000	1 Gbps
4	2018-06-15 16:03:42	1000000000	1 Gbps

There is no way to compare ID 1 with ID 2 as following your previous config (item.value.prev() <> item.value.last())???

In this example trigger should alert: "Ethernet speed was changed from 1 Gbps to 100 Mbps" and when recovers, trigger should alert "Ethernet speed was changed from 100 Mbps to 1 Gbps"

I cant specify every port speed in templates because some devices are Fast Ethernet and others are Gigabit Ethernet. I would like some generic template

Thanks!

[kernbug]

I cant specify every port speed in templates because some devices are Fast Ethernet and others are Gigabit Ethernet. I would like some generic template

Thanks!

Tested with item.diff()=1 and {item.value1} and {item.lastvalue1} in trigger name, very strange behavior. Check it on your setup.

[fdavidcn]

Thanks for your help kernbug!

I will try this config later

[fdavidcn]

Hi kernbug, i was try your config without success

Always get the same value. I was try following functions without lucky:

avg
last
diff
prev

Thanks!

[kernbug]

Hi kernbug, i was try your config without success

Always get the same value. I was try following functions without lucky:

avg
last
diff
prev

Thanks!

[fdavidcn]

Hi Kern!

I was write identical as you show me but the value of MACRO are always the same. I was try in the same trigger to put in name field {ITEM.VALUE}, {ITEM.VALUE1}, {ITEM.VALUE2}, {ITEM.LASTVALUE}, {ITEM.LASTVALUE1}, {ITEM.LASTVALUE2} but all these MACROS have same value

Thanks!

[Kavya]

fdavidcn Were you able to achieve d above addressed issue? as I am also facing the problem in showing previous and current value in Zabbix