diff --git a/ironic/drivers/modules/snmp.py b/ironic/drivers/modules/snmp.py
index 73fa40b53c..63bbc58f99 100644
--- a/ironic/drivers/modules/snmp.py
+++ b/ironic/drivers/modules/snmp.py
@@ -365,7 +365,7 @@ class SNMPDriverSimple(SNMPDriverBase):
 
         :returns: Power state object OID as a tuple of integers.
         """
-        outlet = int(self.snmp_info['outlet'])
+        outlet = self.snmp_info['outlet']
         return self.oid_enterprise + self.oid_device + (outlet,)
 
     def _snmp_power_state(self):
@@ -411,7 +411,7 @@ class SNMPDriverAten(SNMPDriverSimple):
 
         :returns: Power state object OID as a tuple of integers.
         """
-        outlet = int(self.snmp_info['outlet'])
+        outlet = self.snmp_info['outlet']
         return self.oid_enterprise + self.oid_device + (outlet, 0,)
 
 
@@ -530,7 +530,7 @@ class SNMPDriverEatonPower(SNMPDriverBase):
             integers.
         :returns: The full OID as a tuple of integers.
         """
-        outlet = int(self.snmp_info['outlet'])
+        outlet = self.snmp_info['outlet']
         return self.oid_base + oid + (outlet,)
 
     def _snmp_power_state(self):
@@ -597,7 +597,7 @@ def _parse_driver_info(node):
     snmp_info = {}
 
     # Validate PDU driver type
-    snmp_info['driver'] = info.get('snmp_driver')
+    snmp_info['driver'] = info['snmp_driver']
     if snmp_info['driver'] not in DRIVER_CLASSES:
         raise exception.InvalidParameterValue(_(
             "SNMPPowerDriver: unknown driver: '%s'") % snmp_info['driver'])
@@ -633,8 +633,14 @@ def _parse_driver_info(node):
         snmp_info['security'] = info.get('snmp_security')
 
     # Target PDU IP address and power outlet identification
-    snmp_info['address'] = info.get('snmp_address')
-    snmp_info['outlet'] = info.get('snmp_outlet')
+    snmp_info['address'] = info['snmp_address']
+    outlet = info['snmp_outlet']
+    try:
+        snmp_info['outlet'] = int(outlet)
+    except ValueError:
+        raise exception.InvalidParameterValue(_(
+            "SNMPPowerDriver: PDU power outlet index is not an integer: %s")
+            % outlet)
 
     return snmp_info
 
diff --git a/ironic/tests/unit/drivers/modules/test_snmp.py b/ironic/tests/unit/drivers/modules/test_snmp.py
index 485e523c40..ca2da7ea50 100644
--- a/ironic/tests/unit/drivers/modules/test_snmp.py
+++ b/ironic/tests/unit/drivers/modules/test_snmp.py
@@ -211,7 +211,7 @@ class SNMPValidateParametersTestCase(db_base.DbTestCase):
         self.assertEqual(INFO_DICT['snmp_driver'], info['driver'])
         self.assertEqual(INFO_DICT['snmp_address'], info['address'])
         self.assertEqual(INFO_DICT['snmp_port'], str(info['port']))
-        self.assertEqual(INFO_DICT['snmp_outlet'], info['outlet'])
+        self.assertEqual(INFO_DICT['snmp_outlet'], str(info['outlet']))
         self.assertEqual(INFO_DICT['snmp_version'], info['version'])
         self.assertEqual(INFO_DICT['snmp_community'], info['community'])
         self.assertNotIn('security', info)
@@ -349,6 +349,15 @@ class SNMPValidateParametersTestCase(db_base.DbTestCase):
                           snmp._parse_driver_info,
                           node)
 
+    def test__parse_driver_info_invalid_outlet(self):
+        # Make sure exception is raised when the outlet is not integer.
+        info = dict(INFO_DICT)
+        info['snmp_outlet'] = 'nn'
+        node = self._get_test_node(info)
+        self.assertRaises(exception.InvalidParameterValue,
+                          snmp._parse_driver_info,
+                          node)
+
     def test__parse_driver_info_default_version(self):
         # Make sure version defaults to 1 when it is missing.
         info = dict(INFO_DICT)
diff --git a/releasenotes/notes/snmp-outlet-validate-ffbe8e6687172efc.yaml b/releasenotes/notes/snmp-outlet-validate-ffbe8e6687172efc.yaml
new file mode 100644
index 0000000000..c4554c9284
--- /dev/null
+++ b/releasenotes/notes/snmp-outlet-validate-ffbe8e6687172efc.yaml
@@ -0,0 +1,3 @@
+---
+fixes:
+  - Adds validation of ``snmp_outlet`` parameter to SNMP driver.