[ZBX-13278] Wrong "Link Down" trigger prototype logic Created: 2017 Dec 31  Updated: 2024 Apr 10  Resolved: 2018 Apr 19

Status: Closed
Project: ZABBIX BUGS AND ISSUES
Component/s: Templates (T)
Affects Version/s: 3.4.5
Fix Version/s: 3.4.9rc1, 4.0.0alpha6, 4.0 (plan)

Type: Problem report Priority: Minor
Reporter: Yaroslav Assignee: Vitaly Zhuravlev
Resolution: Fixed Votes: 0
Labels: Interfaces, Module, Template
Remaining Estimate: Not Specified
Time Spent: Not Specified
Original Estimate: Not Specified

Team: Team A
Sprint: Sprint 31, Sprint 32
Story Points: 0.125

 Description   

In Template Module Interfaces SNMPv2 and similar templates, it seems to be a wrong logic on triiger prototype:

Interface {#IFNAME}({#IFALIAS}): Link down

{$IFCONTROL:"{#IFNAME}"}=1 and ({Template Module Interfaces SNMPv2:net.if.status[ifOperStatus.{#SNMPINDEX}].last()}=2 and {Template Module Interfaces SNMPv2:net.if.status[ifOperStatus.{#SNMPINDEX}].diff()}=1)

Template Module Interfaces SNMPv2:net.if.status[ifOperStatus.{#SNMPINDEX}].diff()}=1

is responsible for the trigger being in problem state only short time when the port status change, it measures the difference between last received and previous value. So problem closes at the next received value, so in default problem lives only 60 seconds even if the interface link still down.

There is thread in the forum about it: https://www.zabbix.com/forum/showthread.php?p=205891#post205891

 Comments   
Comment by Vitaly Zhuravlev [ 2017 Dec 31 ]

Thank you. For now you can download updated templates here: https://share.zabbix.com/official-templates/template-modules-pack

Comment by Yaroslav [ 2018 Jan 02 ]

OK, thank you for very quick fix!

Comment by Vitaly Zhuravlev [ 2018 Apr 11 ]

Fixed in development branch svn://svn.zabbix.com/branches/dev/ZBX-13278

Comment by Alexander Vladishev [ 2018 Apr 19 ]

Fixed in:

  • 3.4.9rc1 r79869
  • 4.0.0alpha6 r79881
Comment by richlv [ 2018 Nov 26 ]

(1) Looks like documentation for this is missing in https://www.zabbix.com/documentation/3.4/manual/installation/template_changes.

martins-v Added to documentation:

RESOLVED

Comment by Nicola Mauri [ 2023 Feb 21 ]

Hi, this issue still appears in some recent templates as well, i.e.:

https://git.zabbix.com/projects/ZBX/repos/zabbix/browse/templates/net/cisco/cisco_nexus_9000_series_snmp

  • Trigger prototype: Interface {#IFNAME}({#IFALIAS}): Link down
  • Expression:  {$IFCONTROL:{#IFNAME}}=1 and last(/Cisco Nexus 9000 Series by SNMP/net.if.status{#SNMPINDEX})=2 and change(/Cisco Nexus 9000 Series by SNMP/net.if.status{#SNMPINDEX})

In this template a "Discard unchanged  with 6h heartbeat" is used, so this trigger will always recover exactly after 6 hours, even if the interface is still down.

Comment by Dimitri Bellini [ 2023 Feb 22 ]

Hi Zabbix DevTeam,
please pay attention to the @Nicola comments because can be a mass on a "real enviroment".
Thanks so much

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