Nagios Support Forum

I am trying to monitor Monitor Sangoma Vega Gateway with Nagios Core.

I added the Sangoma device in switch.cfg and I am able to monitor the host. I also added the services for monitoring the port. below is the service entry.
define service{
use generic-service ; Inherit values from a template
host_name vegagateway15 ; The name of the host the service is associated with
service_description ISDN-Port3 ; The service description
check_command check_snmp!-C public -o ifOperStatus.5 -m all ; The command used to monitor the service
check_interval 5 ; Check the service every 5 minutes under normal conditions
retry_interval 1 ; Re-check the service every minute until its final/hard state is determined
}
define service{
use generic-service ; Inherit values from a template
host_name vegagateway15 ; The name of the host the service is associated with
service_description ISDN-Port4 ; The service description
check_command check_snmp!-C public -o ifOperStatus.6 ; The command used to monitor the service
check_interval 5 ; Check the service every 5 minutes under normal conditions
retry_interval 1 ; Re-check the service every minute until its final/hard state is determined
}

I am receiving the port status is up like below Current Status:
OK
(for 0d 0h 0m 18s)
Status Information: SNMP OK - up(1)
Performance Data:
Current Attempt: 1/3 (HARD state)
Last Check Time: 08-28-2019 12:10:44
Check Type: ACTIVE

Problem is when the port is down I am getting the Status Information as down but Current status need to change from OK to critical Current Status:
OK
(for 0d 18h 51m 22s)
Status Information: SNMP OK - down(2)
Performance Data:
Current Attempt: 1/3 (HARD state)
Last Check Time: 08-28-2019 12:13:14
Check Type: ACTIVE
Check Latency / Duration: 0.000 / 0.061 seconds

Please help me how can I configure the Current status as critical if the port is down.
Server Details
Nagios® Core™ 4.3.4 - CentOS 7.6

Add -r 1 to the commands
example From the docs

In the example above, the "-o ifOperStatus.1" refers to the OID for the operational status of port 1 on the switch. The "-r 1" option tells the check_snmp plugin to return an OK state if "1" is found in the SNMP result (1 indicates an "up" state on the port) and CRITICAL if it isn't found. The "-m RFC1213-MIB" is optional and tells the check_snmp plugin to only load the "RFC1213-MIB" instead of every single MIB that's installed on your system, which can help speed things up.

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