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zabbix/templates/net/zyxel_snmp/zyxel_mgs3520-28x_snmp
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README.md
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ZYXEL MGS3520-28x by SNMP

Overview

https://service-provider.zyxel.com/emea/en/products/carrier-and-access-switches/access-switches/mgs3520-series

Known Issues

Description: Incorrect handling of SNMP bulk requests. Disable the use of bulk requests in the SNMP interface settings. Version: all versions firmware Device: ZYXEL MGS3520-28

Requirements

Zabbix version: 7.0 and higher.

Tested versions

This template has been tested on:

  • ZYXEL MGS3520-28 V4.10(AATN.1)C0_20190522 | 05/22/2019
  • ZYXEL MGS3520-28F V4.10(AATM.1)C0_20190626 | 06/27/2019

Configuration

Zabbix should be configured according to the instructions in the Templates out of the box section.

Setup

Refer to the vendor documentation.

Macros used

Name Description Default
{$ZYXEL.LLD.FILTER.IF.CONTROL.MATCHES}

Triggers will be created only for interfaces whose description contains the value of this macro

 CHANGE_IF_NEEDED
{$SNMP.TIMEOUT}

The time interval for SNMP agent availability trigger expression.

 5m
{$CPU.UTIL.CRIT} 90
{$MEMORY.UTIL.MAX} 90
{$ZYXEL.LLD.FILTER.IF.NAME.MATCHES}

Filter by discoverable interface names.

 .*
{$ZYXEL.LLD.FILTER.IF.NAME.NOT_MATCHES}

Filter to exclude discovered interfaces by name.

 CHANGE_IF_NEEDED
{$ZYXEL.LLD.FILTER.IF.LINKUPTYPE.MATCHES}

Filter of discoverable link types.

0 - Down link

1 - Cooper link

2 - Fiber link

3 - XFP

4 - CX4

 1|2|3|4
{$ZYXEL.LLD.FILTER.IF.LINKUPTYPE.NOT_MATCHES}

Filter to exclude discovered by link types.

 CHANGE_IF_NEEDED
{$ZYXEL.LLD.FILTER.SFP.STATUS.MATCHES}

Filter of discoverable status.

0 - OK with DDM

1 - OK without DDM

2 - nonoperational

 1|2
{$ZYXEL.LLD.FILTER.SFP.STATUS.NOT_MATCHES}

Filter to exclude discovered by status.

 CHANGE_IF_NEEDED
{$ZYXEL.LLD.FILTER.SFPDDM.DESC.MATCHES}

Filter by discoverable SFP modules name.

 .*
{$ZYXEL.LLD.FILTER.SFPDDM.DESC.NOT_MATCHES}

Filter to exclude discovered SFP modules by name.

 N/A
{$ZYXEL.LLD.SFP.UPDATE}

Receiving data from the SFP module is slow, we do not recommend setting the interval less than 10 minutes.

 10m

Items

Name Description Type Key and additional info
ZYXEL MGS3520-28x: SNMP agent availability Zabbix internal zabbix[host,snmp,available]

Preprocessing

  • Discard unchanged with heartbeat: 1h
ZYXEL MGS3520-28x: Hardware model name

MIB: RFC1213-MIB

A textual description of the entity. This value

should include the full name and version

identification of the system's hardware type,

software operating-system, and networking

software. It is mandatory that this only contain

printable ASCII characters.

 SNMP agent zyxel.3520_28.model

Preprocessing

  • Discard unchanged with heartbeat: 6h
ZYXEL MGS3520-28x: Contact

MIB: RFC1213-MIB

The textual identification of the contact person

for this managed node, together with information

on how to contact this person.

 SNMP agent zyxel.3520_28.contact

Preprocessing

  • Discard unchanged with heartbeat: 6h
ZYXEL MGS3520-28x: Host name

MIB: RFC1213-MIB

An administratively-assigned name for this

managed node. By convention, this is the node's

fully-qualified domain name.

 SNMP agent zyxel.3520_28.name

Preprocessing

  • Discard unchanged with heartbeat: 6h
ZYXEL MGS3520-28x: Location

MIB: RFC1213-MIB

The physical location of this node (e.g.,

`telephone closet, 3rd floor').

 SNMP agent zyxel.3520_28.location

Preprocessing

  • Discard unchanged with heartbeat: 6h
ZYXEL MGS3520-28x: MAC address

MIB: IF-MIB

The interface's address at the protocol layer

immediately `below' the network layer in the

protocol stack. For interfaces which do not have

such an address (e.g., a serial line), this object

should contain an octet string of zero length.

 SNMP agent zyxel.3520_28.mac

Preprocessing

  • Discard unchanged with heartbeat: 6h
ZYXEL MGS3520-28x: Uptime (network)

MIB: RFC1213-MIB

The time (in hundredths of a second) since the

network management portion of the system was last

re-initialized.

 SNMP agent zyxel.3520_28.net.uptime

Preprocessing

  • Custom multiplier: 0.01
ZYXEL MGS3520-28x: Uptime (hardware)

MIB: HOST-RESOURCES-MIB

The amount of time since this host was last initialized.

Note that this is different from sysUpTime in the SNMPv2-MIB

[RFC1907] because sysUpTime is the uptime of the

network management portion of the system.

 SNMP agent zyxel.3520_28.hw.uptime

Preprocessing

  • Check for not supported value

    ⛔️Custom on fail: Set value to: 0

  • Custom multiplier: 0.01
ZYXEL MGS3520-28x: ZyNOS F/W Version

MIB: ZYXEL-ES-COMMON

 SNMP agent zyxel.3520_28.fwversion

Preprocessing

  • Discard unchanged with heartbeat: 6h
ZYXEL MGS3520-28x: Hardware serial number

MIB: ZYXEL-ES-COMMON

Serial number

 SNMP agent zyxel.3520_28.serialnumber

Preprocessing

  • Discard unchanged with heartbeat: 6h
ZYXEL MGS3520-28x: CPU utilization

MIB: ZYXEL-ES-COMMON

Show device CPU load in %, it's the snapshot of CPU load when

getting the values.

 SNMP agent zyxel.3520_28.cpuusage
ZYXEL MGS3520-28x: Memory utilization

MIB: ZYXEL-ES-COMMON

Show device memory usage in %.

 SNMP agent zyxel.3520_28.memusage

Triggers

Name Description Expression Severity Dependencies and additional info
ZYXEL MGS3520-28x: No SNMP data collection

SNMP is not available for polling. Please check device connectivity and SNMP settings.

 max(/ZYXEL MGS3520-28x by SNMP/zabbix[host,snmp,available],{$SNMP.TIMEOUT})=0 Warning
ZYXEL MGS3520-28x: Template does not match hardware

This template is for Zyxel MGS3520-28x series, but connected to {ITEM.VALUE}

 not(last(/ZYXEL MGS3520-28x by SNMP/zyxel.3520_28.model)="MGS3520-28" or last(/ZYXEL MGS3520-28x by SNMP/zyxel.3520_28.model)="MGS3520-28F") Info Manual close: Yes
ZYXEL MGS3520-28x: Host has been restarted

Uptime is less than 10 minutes.

 (last(/ZYXEL MGS3520-28x by SNMP/zyxel.3520_28.hw.uptime)>0 and last(/ZYXEL MGS3520-28x by SNMP/zyxel.3520_28.hw.uptime)<10m) or (last(/ZYXEL MGS3520-28x by SNMP/zyxel.3520_28.hw.uptime)=0 and last(/ZYXEL MGS3520-28x by SNMP/zyxel.3520_28.net.uptime)<10m) Info Manual close: Yes
ZYXEL MGS3520-28x: Firmware has changed

Firmware version has changed. Acknowledge to close the problem manually.

 last(/ZYXEL MGS3520-28x by SNMP/zyxel.3520_28.fwversion,#1)<>last(/ZYXEL MGS3520-28x by SNMP/zyxel.3520_28.fwversion,#2) and length(last(/ZYXEL MGS3520-28x by SNMP/zyxel.3520_28.fwversion))>0 Info Manual close: Yes
ZYXEL MGS3520-28x: Device has been replaced

Device serial number has changed. Acknowledge to close the problem manually.

 last(/ZYXEL MGS3520-28x by SNMP/zyxel.3520_28.serialnumber,#1)<>last(/ZYXEL MGS3520-28x by SNMP/zyxel.3520_28.serialnumber,#2) and length(last(/ZYXEL MGS3520-28x by SNMP/zyxel.3520_28.serialnumber))>0 Info Manual close: Yes
ZYXEL MGS3520-28x: High CPU utilization

The CPU utilization is too high. The system might be slow to respond.

 min(/ZYXEL MGS3520-28x by SNMP/zyxel.3520_28.cpuusage,5m)>{$CPU.UTIL.CRIT} Warning
ZYXEL MGS3520-28x: High memory utilization

The system is running out of free memory.

 min(/ZYXEL MGS3520-28x by SNMP/zyxel.3520_28.memusage,5m)>{$MEMORY.UTIL.MAX} Average

LLD rule Fan discovery

Name Description Type Key and additional info
Fan discovery

An entry in fanRpmTable.

 SNMP agent zyxel.3520_28.fan.discovery

Item prototypes for Fan discovery

Name Description Type Key and additional info
ZYXEL MGS3520-28x: {#ZYXEL.FAN.DESCRIPTION}

MIB: ZYXEL-HW-MONITOR-MIB

Current speed in Revolutions Per Minute (RPM) on the fan.

 SNMP agent zyxel.3520_28.fan[{#SNMPINDEX}]

Preprocessing

  • Discard unchanged with heartbeat: 1h

Trigger prototypes for Fan discovery

Name Description Expression Severity Dependencies and additional info
ZYXEL MGS3520-28x: {#ZYXEL.FAN.DESCRIPTION} is in critical state

Please check the fan unit

 last(/ZYXEL MGS3520-28x by SNMP/zyxel.3520_28.fan[{#SNMPINDEX}])<{#ZYXEL.FANRPM.THRESH.LOW} Average

LLD rule Temperature discovery

Name Description Type Key and additional info
Temperature discovery

An entry in tempTable.

 SNMP agent zyxel.3520_28.temp.discovery

Item prototypes for Temperature discovery

Name Description Type Key and additional info
ZYXEL MGS3520-28x: Temperature "{#ZYXEL.TEMPDESCRIPTION}"

MIB: ZYXEL-HW-MONITOR-MIB

The current temperature measured at this sensor

 SNMP agent zyxel.3520_28.temp[{#SNMPINDEX}]

Preprocessing

  • Discard unchanged with heartbeat: 1h

Trigger prototypes for Temperature discovery

Name Description Expression Severity Dependencies and additional info
ZYXEL MGS3520-28x: Temperature {#ZYXEL.TEMPDESCRIPTION} is in critical state

Please check the temperature

 last(/ZYXEL MGS3520-28x by SNMP/zyxel.3520_28.temp[{#SNMPINDEX}])>{#ZYXEL.TEMP.THRESH.HIGH} Average

LLD rule Voltage discovery

Name Description Type Key and additional info
Voltage discovery

An entry in voltageTable.

 SNMP agent zyxel.3520_28.volt.discovery

Preprocessing

  • JavaScript: The text is too long. Please see the template.

Item prototypes for Voltage discovery

Name Description Type Key and additional info
ZYXEL MGS3520-28x: Nominal "{#ZYXEL.DESCRIPTION}"

MIB: ZYXEL-HW-MONITOR-MIB

The current voltage reading.

 SNMP agent zyxel.3520_28.volt[{#SNMPINDEX}]

Preprocessing

  • Custom multiplier: 0.001

  • Discard unchanged with heartbeat: 1h

Trigger prototypes for Voltage discovery

Name Description Expression Severity Dependencies and additional info
ZYXEL MGS3520-28x: Voltage {#ZYXEL.DESCRIPTION} is in critical state

Please check the power supply

 last(/ZYXEL MGS3520-28x by SNMP/zyxel.3520_28.volt[{#SNMPINDEX}])<{#ZYXEL.VOLT.THRESH.LOW} Average

LLD rule Interface discovery

Name Description Type Key and additional info
Interface discovery SNMP agent zyxel.3520_28.net.if.discovery

Item prototypes for Interface discovery

Name Description Type Key and additional info
ZYXEL MGS3520-28x: Port {#SNMPINDEX}: Speed Duplex

MIB: ZYXEL-PORT-MIB

Select The speed and the duplex mode of the Ethernet connection on this port. Selecting Auto

(auto-negotiation) allows one port to negotiate with a peer port automatically to obtain the

connection speed and duplex mode that both ends support. When auto-negotiation is turned on,

a port on the Switch negotiates with the peer automatically to determine the connection speed

and duplex mode. If the peer port does not support auto-negotiation or turns off this feature,

the Switch determines the connection speed by detecting the signal on the cable and using half

duplex mode. Thus requiring you to make sure that the settings of the peer port are the same in

order to connect.

 SNMP agent zyxel.3520_28.net.if.speed_duplex[{#SNMPINDEX}]

Preprocessing

  • Discard unchanged with heartbeat: 6h
ZYXEL MGS3520-28x: Port {#SNMPINDEX}: Interface description

MIB: ZYXEL-PORT-MIB

Descriptive name that identifies this port.

 SNMP agent zyxel.3520_28.net.if.name[{#SNMPINDEX}]

Preprocessing

  • Discard unchanged with heartbeat: 6h
ZYXEL MGS3520-28x: Port {#SNMPINDEX}: Link type

MIB: ZYXEL-PORT-MIB

The entry shows the linkUp cable type (copper, fiber, xfp or cx4) for the combo ports.

 SNMP agent zyxel.3520_28.net.if.link_type[{#SNMPINDEX}]

Preprocessing

  • Discard unchanged with heartbeat: 6h
ZYXEL MGS3520-28x: Port {#SNMPINDEX}: Interface name

MIB: IF-MIB

A textual string containing information about the interface

 SNMP agent zyxel.3520_28.net.if.descr[{#SNMPINDEX}]

Preprocessing

  • Discard unchanged with heartbeat: 6h
ZYXEL MGS3520-28x: Port {#SNMPINDEX}: Operational status

MIB: IF-MIB

The current operational state of the interface.

The testing(3) state indicates that no operational

packets can be passed.

 SNMP agent zyxel.3520_28.net.if.operstatus[{#SNMPINDEX}]

Preprocessing

  • Discard unchanged with heartbeat: 6h
ZYXEL MGS3520-28x: Port {#SNMPINDEX}: Administrative status

MIB: IF-MIB

The desired state of the interface. The

testing(3) state indicates that no operational

packets can be passed.

 SNMP agent zyxel.3520_28.net.if.adminstatus[{#SNMPINDEX}]

Preprocessing

  • Discard unchanged with heartbeat: 6h
ZYXEL MGS3520-28x: Port {#SNMPINDEX}: Incoming traffic

MIB: IF-MIB

The total number of octets received on the interface,

including framing characters.

 SNMP agent zyxel.3520_28.net.if.in.traffic[{#SNMPINDEX}]

Preprocessing

  • Custom multiplier: 8

  • Change per second
ZYXEL MGS3520-28x: Port {#SNMPINDEX}: Incoming unicast packages

MIB: IF-MIB

The number of packets, delivered by this sub-layer to a

higher (sub-)layer, which were not addressed to a multicast

or broadcast address at this sub-layer

 SNMP agent zyxel.3520_28.net.if.in.ucastpkts[{#SNMPINDEX}]

Preprocessing

  • Change per second
ZYXEL MGS3520-28x: Port {#SNMPINDEX}: Incoming multicast packages

MIB: IF-MIB

The number of packets, delivered by this sub-layer to a

higher (sub-)layer, which were addressed to a multicast

address at this sub-layer. For a MAC layer protocol, this

includes both Group and Functional addresses.

 SNMP agent zyxel.3520_28.net.if.in.multicastpkts[{#SNMPINDEX}]

Preprocessing

  • Change per second
ZYXEL MGS3520-28x: Port {#SNMPINDEX}: Incoming broadcast packages

MIB: IF-MIB

The number of packets, delivered by this sub-layer to a

higher (sub-)layer, which were addressed to a broadcast

address at this sub-layer.

 SNMP agent zyxel.3520_28.net.if.in.broadcastpkts[{#SNMPINDEX}]

Preprocessing

  • Change per second
ZYXEL MGS3520-28x: Port {#SNMPINDEX}: Outgoing traffic

MIB: IF-MIB

The total number of octets transmitted out of the

interface, including framing characters. This object is a

64-bit version of ifOutOctets.

 SNMP agent zyxel.3520_28.net.if.out.traffic[{#SNMPINDEX}]

Preprocessing

  • Custom multiplier: 8

  • Change per second
ZYXEL MGS3520-28x: Port {#SNMPINDEX}: Outgoing unicast packages

MIB: IF-MIB

The total number of packets that higher-level protocols

requested be transmitted, and which were not addressed to a

multicast or broadcast address at this sub-layer, including

those that were discarded or not sent.

 SNMP agent zyxel.3520_28.net.if.out.ucastpkts[{#SNMPINDEX}]

Preprocessing

  • Change per second
ZYXEL MGS3520-28x: Port {#SNMPINDEX}: Outgoing multicast packages

MIB: IF-MIB

The total number of packets that higher-level protocols

requested be transmitted, and which were addressed to a

multicast address at this sub-layer, including those that

were discarded or not sent. For a MAC layer protocol, this

includes both Group and Functional addresses.

 SNMP agent zyxel.3520_28.net.if.out.multicastpkts[{#SNMPINDEX}]

Preprocessing

  • Change per second
ZYXEL MGS3520-28x: Port {#SNMPINDEX}: Outgoing broadcast packages

MIB: IF-MIB

The total number of packets that higher-level protocols

requested be transmitted, and which were addressed to a

broadcast address at this sub-layer, including those that

were discarded or not sent.

 SNMP agent zyxel.3520_28.net.if.out.broadcastpkts[{#SNMPINDEX}]

Preprocessing

  • Change per second
ZYXEL MGS3520-28x: Port {#SNMPINDEX}: Link speed

MIB: IF-MIB

An estimate of the interface's current bandwidth in bits per second

 SNMP agent zyxel.3520_28.net.if.highspeed[{#SNMPINDEX}]

Preprocessing

  • Custom multiplier: 1000000

  • Discard unchanged with heartbeat: 6h
ZYXEL MGS3520-28x: Port {#SNMPINDEX}: Incoming utilization

Interface utilization percentage

 Calculated zyxel.3520_28.net.if.in.util[{#SNMPINDEX}]

Preprocessing

  • In range: 0 -> 100

    ⛔️Custom on fail: Discard value

  • JavaScript: The text is too long. Please see the template.
ZYXEL MGS3520-28x: Port {#SNMPINDEX}: Outgoing utilization

Interface utilization percentage

 Calculated zyxel.3520_28.net.if.out.util[{#SNMPINDEX}]

Preprocessing

  • In range: 0 -> 100

    ⛔️Custom on fail: Discard value

  • JavaScript: The text is too long. Please see the template.

Trigger prototypes for Interface discovery

Name Description Expression Severity Dependencies and additional info
ZYXEL MGS3520-28x: Port {#SNMPINDEX}: Link down

This trigger expression works as follows:
1. It can be triggered if the operations status is down.
2. {$IFCONTROL:"{#IFNAME}"}=1 - a user can redefine context macro to value - 0. That marks this interface as not important. No new trigger will be fired if this interface is down.
3. {TEMPLATE_NAME:METRIC.diff()}=1 - the trigger fires only if the operational status was up to (1) sometime before (so, do not fire for the 'eternal off' interfaces.)

WARNING: if closed manually - it will not fire again on the next poll, because of .diff.

 last(/ZYXEL MGS3520-28x by SNMP/zyxel.3520_28.net.if.operstatus[{#SNMPINDEX}])=2 and last(/ZYXEL MGS3520-28x by SNMP/zyxel.3520_28.net.if.operstatus[{#SNMPINDEX}],#1)<>last(/ZYXEL MGS3520-28x by SNMP/zyxel.3520_28.net.if.operstatus[{#SNMPINDEX}],#2) Average Manual close: Yes

LLD rule SFP without DDM discovery

Name Description Type Key and additional info
SFP without DDM discovery

SFP module discovery.

 SNMP agent zyxel.3520_28.sfp.discovery

Item prototypes for SFP without DDM discovery

Name Description Type Key and additional info
ZYXEL MGS3520-28x: SFP {#SNMPINDEX}: Status

MIB: ZYXEL-TRANSCEIVER-MIB

Transceiver module type.

 SNMP agent zyxel.3520_28.sfp.status[{#SNMPINDEX}]

Preprocessing

  • Discard unchanged with heartbeat: 1h
ZYXEL MGS3520-28x: SFP {#SNMPINDEX}: Vendor

MIB: ZYXEL-TRANSCEIVER-MIB

Transceiver module vendor name.

 SNMP agent zyxel.3520_28.sfp.vendor[{#SNMPINDEX}]

Preprocessing

  • Discard unchanged with heartbeat: 1h
ZYXEL MGS3520-28x: SFP {#SNMPINDEX}: Part number

MIB: ZYXEL-TRANSCEIVER-MIB

Part number provided by transceiver module vendor.

 SNMP agent zyxel.3520_28.sfp.part[{#SNMPINDEX}]

Preprocessing

  • Discard unchanged with heartbeat: 1h
ZYXEL MGS3520-28x: SFP {#SNMPINDEX}: Serial number

MIB: ZYXEL-TRANSCEIVER-MIB

Serial number provided by transceiver module vendor.

 SNMP agent zyxel.3520_28.sfp.serialnumber[{#SNMPINDEX}]

Preprocessing

  • Discard unchanged with heartbeat: 1h
ZYXEL MGS3520-28x: SFP {#SNMPINDEX}: Revision

MIB: ZYXEL-TRANSCEIVER-MIB

Revision level for part number provided by transceiver module vendor.

 SNMP agent zyxel.3520_28.sfp.revision[{#SNMPINDEX}]

Preprocessing

  • Discard unchanged with heartbeat: 1h
ZYXEL MGS3520-28x: SFP {#SNMPINDEX}: Date code

MIB: ZYXEL-TRANSCEIVER-MIB

Transceiver module vendor's manufacturing date code.

 SNMP agent zyxel.3520_28.sfp.datecode[{#SNMPINDEX}]

Preprocessing

  • Discard unchanged with heartbeat: 1h
ZYXEL MGS3520-28x: SFP {#SNMPINDEX}: Transceiver

MIB: ZYXEL-TRANSCEIVER-MIB

Transceiver module type names.

 SNMP agent zyxel.3520_28.sfp.transceiver[{#SNMPINDEX}]

Preprocessing

  • Discard unchanged with heartbeat: 1h

Trigger prototypes for SFP without DDM discovery

Name Description Expression Severity Dependencies and additional info
ZYXEL MGS3520-28x: SFP {#SNMPINDEX} has been replaced

SFP {#SNMPINDEX} serial number has changed. Acknowledge to close the problem manually.

 last(/ZYXEL MGS3520-28x by SNMP/zyxel.3520_28.sfp.serialnumber[{#SNMPINDEX}],#1)<>last(/ZYXEL MGS3520-28x by SNMP/zyxel.3520_28.sfp.serialnumber[{#SNMPINDEX}],#2) and length(last(/ZYXEL MGS3520-28x by SNMP/zyxel.3520_28.sfp.serialnumber[{#SNMPINDEX}]))>0 Info Manual close: Yes

LLD rule SFP with DDM discovery

Name Description Type Key and additional info
SFP with DDM discovery

SFP DDM module discovery.

 SNMP agent zyxel.3520_28.sfp.ddm.discovery

Preprocessing

  • JavaScript: The text is too long. Please see the template.

Item prototypes for SFP with DDM discovery

Name Description Type Key and additional info
ZYXEL MGS3520-28x: SFP {#ZYXEL.SFP.PORT}: {#ZYXEL.SFP.DESCRIPTION}

MIB: ZYXEL-TRANSCEIVER-MIB

Transceiver module DDM data ({#ZYXEL.SFP.DESCRIPTION}).

 SNMP agent zyxel.3520_28.sfp.ddm[{#SNMPINDEX}]

Preprocessing

  • Custom multiplier: 0.01

  • Discard unchanged with heartbeat: 6h

Trigger prototypes for SFP with DDM discovery

Name Description Expression Severity Dependencies and additional info
ZYXEL MGS3520-28x: SFP {#ZYXEL.SFP.PORT}: High {#ZYXEL.SFP.DESCRIPTION}

The upper threshold value of the parameter is exceeded

 last(/ZYXEL MGS3520-28x by SNMP/zyxel.3520_28.sfp.ddm[{#SNMPINDEX}]) > {#ZYXEL.SFP.WARN.MAX} Warning Manual close: Yes
ZYXEL MGS3520-28x: SFP {#ZYXEL.SFP.PORT}: Low {#ZYXEL.SFP.DESCRIPTION}

The parameter values are less than the lower threshold

 last(/ZYXEL MGS3520-28x by SNMP/zyxel.3520_28.sfp.ddm[{#SNMPINDEX}]) < {#ZYXEL.SFP.WARN.MIN} Warning Manual close: Yes

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