# Logstash: SNMP Poll Input - skipping "error: no such.."

**URL:** <https://discuss.elastic.co/t/logstash-snmp-poll-input-skipping-error-no-such/347051>\
**Category:** Logstash\
**Created:** [November 13, 2023, 6:11pm UTC](https://discuss.elastic.co/t/logstash-snmp-poll-input-skipping-error-no-such/347051 "2023-11-13T18:11:17Z")\
**Posts on this page:** 4\
**Page:** 1

<div class="post-metadata">

**Author:** ![erikg](https://avatars.discourse-cdn.com/v4/letter/e/91b2a8/32.png) [@erikg](https://discuss.elastic.co/u/erikg)\
**Post date:** [November 13, 2023, 6:11pm UTC](https://discuss.elastic.co/t/logstash-snmp-poll-input-skipping-error-no-such/347051/1 "2023-11-13T18:11:17Z")

</div>

Hello,  
I am using SNMP poll input for logstash.  
Using SNMP V3, I have a wide range of network devices to monitor which means many oids that are specific by vendor.

I want to know if there is a way to skip oids in which they return `"error: no such instance currently exists at this OID".`  
The reason why I would like to skip is that the oid might apply to one host but not the other. I have many oids, doing this would be a lot of work for every field:

```auto
if [snmp][cpu_total_pct] == "error: no such instance currently exists at this OID\" {  
  mutate {
    remove_field => ["[snmp][cpu_total_pct]"]
  }
}

```

Wondering if someone might have a better approach to skip oids returning "error.." or a way to remove fields with out having to specify each field, just the value

---

<div class="post-metadata">

**Author:** ![Badger](https://sea2.discourse-cdn.com/elastic/user_avatar/discuss.elastic.co/badger/32/25190_2.png) [@Badger](https://discuss.elastic.co/u/Badger)\
**Post date:** [November 13, 2023, 10:51pm UTC](https://discuss.elastic.co/t/logstash-snmp-poll-input-skipping-error-no-such/347051/2 "2023-11-13T22:51:56Z")

</div>

You could try something like

```
    ruby {
        code => '
            snmp = event.get("snmp")
            if snmp
                snmp.each { |k, v|
                    if v =~ /error: no such instance currently exists at this OID/
                        event.remove("[snmp][#{k}]")
                    end
                }
            end
        '
    }

```

---

<div class="post-metadata">

**Author:** ![erikg](https://avatars.discourse-cdn.com/v4/letter/e/91b2a8/32.png) [@erikg](https://discuss.elastic.co/u/erikg)\
**Post date:** [November 13, 2023, 10:59pm UTC](https://discuss.elastic.co/t/logstash-snmp-poll-input-skipping-error-no-such/347051/3 "2023-11-13T22:59:49Z")

</div>

Thanks it works! You're a ruby master. Badger!

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<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/elastic/original/3X/1/a/1ac57faf039f6b580b3f104ef42a2a89e41014de.png) [@system](https://discuss.elastic.co/u/system)\
**Post date:** [December 11, 2023, 11:00pm UTC](https://discuss.elastic.co/t/logstash-snmp-poll-input-skipping-error-no-such/347051/4 "2023-12-11T23:00:12Z")

</div>

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