home-assistant.io/source/_integrations/snmp.markdown

title	description	ha_category	ha_iot_class	ha_release	ha_domain	ha_platforms	ha_integration_type	ha_codeowners	ha_quality_scale
SNMP	Instructions on how to integrate SNMP into Home Assistant.	Network Presence detection Sensor Switch	Local Polling	0.57	snmp	device_tracker sensor switch	integration	@nmaggioni	legacy

A lot of Wi-Fi access points and Wi-Fi routers support the Simple Network Management Protocol (SNMP). This is a standardized method for monitoring/managing network connected devices. SNMP uses a tree-like hierarchy where each node is an object. Many of these objects contain (live) lists of instances and metrics, like network interfaces, disks and Wi-Fi registrations.

There is currently support for the following device types within Home Assistant:

• Presence detection
• Sensor
  • Finding OIDs
  • Examples
    • Printer uptime minutes
• Switch

{% important %} This device tracker needs SNMP to be enabled on the router. It could be that you need to install the SNMP support manually. {% endimportant %}

Presence detection

The following OID examples pull the current MAC Address table from a router. This reflects all recent devices seen on the network. However, since devices are not removed until they time out, this is less effective for device tracker integration page than desirable. It is recommended to use Ping or Nmap instead.

Brand	Device/Firmware	OID
Aerohive	AP230	1.3.6.1.4.1.26928.1.1.1.2.1.2.1.1
Apple	Airport Express (2nd gen.) 7.6.9	1.3.6.1.2.1.3.1.1.2 or 1.3.6.1.2.1.4.22.1.2
Aruba	IAP325 on AOS 6.5.4.8	1.3.6.1.4.1.14823.2.3.3.1.2.4.1.1
BiPAC	7800DXL Firmware 2.32e	1.3.6.1.2.1.17.7.1.2.2.1.1
DD-WRT	unknown version/model	1.3.6.1.2.1.4.22.1.2
IPFire	2.25	1.3.6.1.2.1.4.22.1.2
MikroTik	unknown RouterOS version/model	1.3.6.1.4.1.14988.1.1.1.2.1.1
MikroTik	RouterOS 6.x on RB2011	1.3.6.1.2.1.4.22.1.2
OpenWrt	Chaos Calmer 15.05	1.3.6.1.2.1.4.22.1.2
OPNSense	19.1	1.3.6.1.2.1.4.22.1.2
pfSense	2.2.4	1.3.6.1.2.1.4.22.1.2
Ruckus	ZoneDirector 9.13.3	1.3.6.1.4.1.25053.1.2.2.1.1.3.1.1.1.6
TP-Link	Archer VR1600v	1.3.6.1.2.1.3.1.1.2.16.1
TP-Link	Archer VR2600v	1.3.6.1.2.1.3.1.1.2.19.1
TP-Link	Archer VR600	1.3.6.1.2.1.3.1.1.2
Ubiquiti	Edgerouter Lite v1.9.0	1.3.6.1.2.1.4.22.1.2

To use the SNMP version 1 or 2c platform in your installation, add the following to your configuration.yaml file:

# Example configuration.yaml entry for SNMP version 1 or 2c
device_tracker:
  - platform: snmp
    host: 192.168.1.1
    community: public
    baseoid: 1.3.6.1.4.1.14988.1.1.1.2.1.1

If you want to use encryption, you must enable SNMP version 3 by adding auth_key and priv_key variables and enabling SNMP version 3 on your router. Currently only SHA1 is supported for authentication and AES for encryption. Example of SNMPv3 configuration:

# Example configuration.yaml entry for SNMP version 3
device_tracker:
  - platform: snmp
    host: 192.168.1.1
    community: USERNAME
    auth_key: AUTHPASS
    priv_key: PRIVPASS
    baseoid: 1.3.6.1.4.1.14988.1.1.1.2.1.1

{% configuration %} host: description: The IP address of the router, e.g., 192.168.1.1. required: true type: string community: description: The SNMP community which is set for the device. Most devices have a default community set to public with read-only permission (which is sufficient). required: true type: string baseoid: description: The OID prefix where wireless client registrations can be found, usually vendor specific. It's advised to use the numerical notation. To find this base OID, check vendor documentation or check the MIB file for your device. required: true type: string auth_key: description: "Authentication key for SNMPv3. Variable priv_key must also be set." required: inclusive type: string priv_key: description: "Privacy key SNMPv3. Variable auth_key must also be set." required: inclusive type: string {% endconfiguration %}

See the device tracker integration page for instructions how to configure the people to be tracked.

{% include integrations/using_templates.md %}

Sensor

The snmp sensor platform displays information available through the Simple Network Management Protocol (SNMP). SNMP uses a tree-like hierarchy where each node is an object, and is mainly supported by network-oriented devices such as routers, modems and printers.

To enable this sensor in your installation, add the following to your configuration.yaml file:

# Example configuration.yaml entry
sensor:
  - platform: snmp
    host: 192.168.1.32
    baseoid: 1.3.6.1.4.1.2021.10.1.3.1

{% configuration %} accept_errors: description: "Determines whether the sensor should start and keep working even if the SNMP host is unreachable or not responding. This allows the sensor to be initialized properly even if, for example, your printer is not on when you start Home Assistant." required: false type: string default: false auth_key: description: Authentication key to use for SNMP v3. required: false type: string default: no key auth_protocol: description: Authentication protocol to use for SNMP v3. required: false type: string default: 'none' baseoid: description: The OID where the information is located. It's advised to use the numerical notation. required: true type: string community: description: "The SNMP community which is set for the device for SNMP v1 and v2c. Most devices have a default community set to public with read-only permission (which is sufficient)." required: false type: string default: 'public' default_value: description: "Determines what value the sensor should take if accept_errors is set and the host is unreachable or not responding. If not set, the sensor will have value unknown in case of errors." required: false type: string device_class: description: Sets the class of the device, changing the device state and icon that is displayed on the frontend. required: false type: string host: description: The IP address of your host, e.g., 192.168.1.32. required: false type: string default: 'localhost' icon: description: Defines a template for the icon of the SNMP sensor. required: false type: template name: description: Defines a template for the name of the SNMP sensor. required: false type: template default: SNMP picture: description: Defines a template for the entity picture of the SNMP sensor. required: false type: template port: description: The SNMP port of your host. required: false type: string default: '161' priv_key: description: Privacy key to use for SNMP v3. required: false type: string default: no key priv_protocol: description: Privacy protocol to use for SNMP v3. required: false type: string default: 'none' state_class: description: The state_class of the sensor. required: false type: string unique_id: description: An ID that uniquely identifies this entity. This allows changing the name, icon and entity_id from the web interface. required: false type: string unit_of_measurement: description: Defines the units of measurement of the sensor, if any. required: false type: string username: description: Username to use for authentication. required: false type: string default: '' value_template: description: "Defines a template to parse the value." required: false type: template version: description: "Version of SNMP protocol, 1, 2c or 3. Version 2c or higher is needed to read data from 64-bit counters." required: false type: string default: '1' {% endconfiguration %}

Valid values for auth_protocol:

• none
• hmac-md5
• hmac-sha
• hmac128-sha224
• hmac192-sha256
• hmac256-sha384
• hmac384-sha512

Valid values for priv_protocol:

• none
• des
• 3des-ede
• aes-cfb-128
• aes-cfb-192
• aes-cfb-256

Finding OIDs

OIDs may vary on different systems because they are vendor-specific. Besides the device's manual, the OID Repository is a good place to start if you are looking for OIDs. As an example, the following OIDs are for the load of a Linux system.

• 1 minute Load: 1.3.6.1.4.1.2021.10.1.3.1
• 5 minute Load: 1.3.6.1.4.1.2021.10.1.3.2
• 15 minute Load: 1.3.6.1.4.1.2021.10.1.3.3

There is a large amount of tools available to work with SNMP. snmpwalk let you easily retrieve the value of an OID.

$ snmpwalk -Os -c public -v 2c 192.168.1.32 1.3.6.1.4.1.2021.10.1.3.1
laLoad.1 = STRING: 0.19

Examples

Printer uptime minutes

According to the most common SNMP standard, the uptime of a device is accessible under OID 1.3.6.1.2.1.1.3.0. The value represented using a format called TimeTicks, in units of hundredths of a second.

To create a sensor that displays the uptime for your printer in minutes, you can use this configuration:

{% raw %}

# Example configuration.yaml entry
sensor:
  - platform: snmp
    name: "Printer uptime"
    host: 192.168.2.21
    baseoid: 1.3.6.1.2.1.1.3.0
    accept_errors: true
    unit_of_measurement: "minutes"
    value_template: "{{((value | int) / 6000) | int}}"

{% endraw %}

The accept_errors option will allow the sensor to work even if the printer is not on when Home Assistant is first started: the sensor will just display a - instead of a minute count.

The value_template option converts the original value to minutes.

Switch

The snmp switch platform allows you to control SNMP-enabled equipment.

Currently, only SNMP OIDs that accept integer values are supported. SNMP v1, v2c and v3 are supported.

To use an SNMP switch in your installation:

# Example configuration.yaml entry:
switch:
  - platform: snmp
    host: 192.168.0.2
    baseoid: 1.3.6.1.4.1.19865.1.2.1.4.0

{% configuration %} baseoid: description: The SNMP BaseOID which to poll for the state of the switch. required: true type: string command_oid: description: The SNMP OID which to set in order to turn the switch on and off, if different from baseoid. required: false type: string host: description: The IP/host which to control. required: false type: string default: 'localhost' port: description: The port on which to communicate. required: false type: string default: '161' community: description: community string to use for authentication (SNMP v1 and v2c). required: false type: string default: 'private' username: description: Username to use for authentication. required: false type: string default: '' auth_key: description: Authentication key to use for SNMP v3. required: false type: string default: no key auth_protocol: description: Authentication protocol to use for SNMP v3. required: false type: string default: 'none' priv_key: description: Privacy key to use for SNMP v3. required: false type: string default: no key priv_protocol: description: Privacy protocol to use for SNMP v3. required: false type: string default: 'none' version: description: SNMP version to use - either 1, 2c or 3. required: false type: string default: '1' payload_on: description: What return value represents an On state for the switch. The same value is used in writes to turn on the switch if command_payload_on is not set. required: false type: string default: '1' payload_off: description: What return value represents an Off state for the switch. The same value is used in writes to turn off the switch if command_payload_off is not set. required: false type: string default: '0' command_payload_on: description: The value to write to turn on the switch, if different from payload_on. required: false type: string command_payload_off: description: The value to write to turn off the switch, if different from payload_off. required: false type: string vartype: description: The SNMP vartype for the payload_on and payload_off commands as defined in RFC1902. required: false type: string
default: 'none' {% endconfiguration %}

You should check with your device's vendor to find out the correct BaseOID and what values turn the switch on and off.

Valid values for auth_protocol:

• none
• hmac-md5
• hmac-sha
• hmac128-sha224
• hmac192-sha256
• hmac256-sha384
• hmac384-sha512

Valid values for priv_protocol:

• none
• des
• 3des-ede
• aes-cfb-128
• aes-cfb-192
• aes-cfb-256

Valid values for vartype:

• Counter32
• Counter64
• Gauge32
• Integer32
• Integer
• IpAddress
• ObjectIdentifier
• OctetString
• Opaque
• TimeTicks
• Unsigned32

Complete examples:

switch:
  - platform: snmp
    name: SNMP v1 switch
    host: 192.168.0.2
    community: private
    baseoid: 1.3.6.1.4.1.19865.1.2.1.4.0
    payload_on: 1
    payload_off: 0

  - platform: snmp
    name: SNMP v3 switch
    host: 192.168.0.3
    version: "3"
    username: "myusername"
    auth_key: "myauthkey"
    auth_protocol: "hmac-sha"
    priv_key: "myprivkey"
    priv_protocol: "aes-cfb-128"
    baseoid: 1.3.6.1.4.1.19865.1.2.1.4.0
    payload_on: 1
    payload_off: 0

  - platform: snmp
    name: Enable PoE on Netgear switch port 2 using SNMP v3
    host: 192.168.0.4
    version: "3"
    username: "myusername"
    auth_key: "myauthkey"
    auth_protocol: "hmac-sha"
    priv_key: "myprivkey"
    priv_protocol: "des"
    baseoid: 1.3.6.1.4.1.4526.11.15.1.1.1.1.1.2
    payload_on: 15400
    payload_off: 3000
    vartype: Gauge32