# Trap Listener Input

NetObserv SNMP Trap listens for metrics, status and other telemetry data sent by network devices using SNMP.

#### EF\_INPUT\_TRAP\_LISTENER\_IP

This configuration specifies the IP address on which the SNMP Trap listener will listen for incoming SNMP Traps.

* Default
  * `0.0.0.0`

#### EF\_INPUT\_TRAP\_LISTENER\_PORT

This configuration specifies the port for the SNMP Trap listener to bind itself to.

* Default
  * `162`

#### EF\_INPUT\_TRAP\_LISTENER\_NORMALIZER\_POOL\_SIZE

This configuration specifies the size of the pool of normalizer workers that will be initialized to process incoming SNMP Traps.

* Minimum Value
  * `1`
* Default
  * `3`

#### EF\_INPUT\_TRAP\_LISTENER\_TRANSPORT

This configuration specifies the transport protocol to be used by the SNMP Trap listener.

* Valid Values
  * `udp`, `tcp`
* Default
  * `udp`

#### EF\_INPUT\_TRAP\_LISTENER\_AUTHORITATIVE\_ENGINE\_ID

This configuration specifies the authoritative engine ID to be used by the SNMP Trap listener.

* Default
  * `authoritative_engine_id`

#### EF\_INPUT\_TRAP\_LISTENER\_CREDENTIALS\_DIRECTORY\_PATH

This setting specifies the path to the directory where the [Listener Credentials](/trapcoll/configuration/receiving-traps/credentials.md) definitions files are located.

* Default
  * `/etc/elastiflow/snmp/traps/credentials`

#### EF\_INPUT\_TRAP\_LISTENER\_DEVICE\_STORE\_PATH

This setting specifies the path to the directory where the [Listener Devices](/trapcoll/configuration/receiving-traps/devices.md) definitions files are located.

* Default
  * `/var/lib/elastiflow/trapcoll/devices.yml`


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