Monitor switch port traffic using Nagios to alert traffic below the threshold

Requirement: Use the Nagios service to monitor 24 ports on a Cisco switch, send an alarm when traffic is below 2mb/s, alarm cancel when traffic is higher than 3mb/s, and in a warning warning state when traffic is between 2mb/s-3mb/s.

Operation Method:

First: Write the script file:

vim/usr/lib64/nagios/plugins/check_traffic_less.sh

#!/bin/bashrxpre=$ (/usr/bin/snmpwalk -v 2c -c  public 10.10.3.242 if-mib::ifinoctets.10124 | awk  ' {print $4} ') sleep  1rxnext=$ (/usr/bin/snmpwalk -v 2c -c public 10.10.3.242 if-mib::ifinoctets.10124  | awk  ' {print $4} ') rx=$ ((${rxnext}-${rxpre})) if [[  $RX  -lt 2097152  ]];thenrx=$ (echo  $RX  | awk  ' {print $1/1048576  "MB/S"} ')     echo  "critical,rx is  $RX"    exit 2elif [[  $RX  -gt  3145728 ]];thenrx=$ (echo  $RX  | awk  ' {print $1/1048576  "MB/S"} ')     echo  "ok,rx is  $RX"    exit 0elserx=$ (echo  $RX  | awk   ' {print $1/1048576  ' MB/S "} ')    echo " warning,rx is  $RX "    exit 1fi 

Second: Add permissions
chmod +x check_traffic_less.sh

Third: Configure the Commands.cfg file
Define Command{
Command_name check_traffic_less
Command_line $USER 1$/check_traffic_less.sh
}

IV: Configure the Switch.cfg file
Define Service{
Use GENERIC-SERVICE,SRV-PNP; Inherit values from a template
HOST_NAME h19_unicom_access_switch_3.242
Service_description check_traffice_less_g0/24
Check_command check_traffic_less
}

V: Reload Service::
Service Nagios Reload

Results:

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Monitor switch port traffic using Nagios to alert traffic below the threshold