diff --git a/src/azure-cli/azure/cli/command_modules/acs/_consts.py b/src/azure-cli/azure/cli/command_modules/acs/_consts.py
index 46b826b78d9..d507964e5b8 100644
--- a/src/azure-cli/azure/cli/command_modules/acs/_consts.py
+++ b/src/azure-cli/azure/cli/command_modules/acs/_consts.py
@@ -43,8 +43,8 @@
 CONST_AVAILABILITY_SET = "AvailabilitySet"
 
 # vm size
-CONST_DEFAULT_NODE_VM_SIZE = "Standard_DS2_v2"
-CONST_DEFAULT_WINDOWS_NODE_VM_SIZE = "Standard_D2s_v3"
+CONST_DEFAULT_NODE_VM_SIZE = "" 
+CONST_DEFAULT_WINDOWS_NODE_VM_SIZE = ""
 
 # gpu instance
 CONST_GPU_INSTANCE_PROFILE_MIG1_G = "MIG1g"
diff --git a/src/azure-cli/azure/cli/command_modules/acs/tests/latest/test_aks_commands.py b/src/azure-cli/azure/cli/command_modules/acs/tests/latest/test_aks_commands.py
index 5ad5ce8fa48..e4846f3a6d2 100644
--- a/src/azure-cli/azure/cli/command_modules/acs/tests/latest/test_aks_commands.py
+++ b/src/azure-cli/azure/cli/command_modules/acs/tests/latest/test_aks_commands.py
@@ -244,7 +244,7 @@ def test_aks_create_default(self, resource_group, resource_group_location):
             self.exists('fqdn'),
             self.check('agentPoolProfiles[0].count', 1),
             self.check('agentPoolProfiles[0].osType', 'Linux'),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('agentPoolProfiles[0].nodeLabels.label1', 'value1'),
             self.check('agentPoolProfiles[0].nodeLabels.label2', 'value2'),
             self.check('agentPoolProfiles[0].tags.tag1', 'tv1'),
@@ -334,7 +334,7 @@ def test_aks_create_default_sp(self, resource_group, resource_group_location, sp
             self.exists('fqdn'),
             self.check('agentPoolProfiles[0].count', 1),
             self.check('agentPoolProfiles[0].osType', 'Linux'),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('agentPoolProfiles[0].nodeLabels.label1', 'value1'),
             self.check('agentPoolProfiles[0].nodeLabels.label2', 'value2'),
             self.check('agentPoolProfiles[0].tags.tag1', 'tv1'),
@@ -750,7 +750,7 @@ def test_aks_create_default_service(self, resource_group, resource_group_locatio
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 1),
             self.check('agentPoolProfiles[0].osType', 'Linux'),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('agentPoolProfiles[0].maxPods', 100),
             self.check('dnsPrefix', '{dns_name_prefix}'),
             self.check('agentPoolProfiles[0].nodeLabels.label1', 'value1'),
@@ -828,7 +828,7 @@ def test_aks_create_service_no_wait(self, resource_group, resource_group_locatio
             self.check('name', '{name}'),
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 1),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('dnsPrefix', '{dns_name_prefix}'),
             self.check('provisioningState', 'Succeeded'),
         ])
@@ -862,7 +862,7 @@ def test_aks_create_service_no_wait(self, resource_group, resource_group_locatio
             self.check('name', '{name}'),
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 1),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('dnsPrefix', '{dns_name_prefix}'),
             self.check('provisioningState', 'Succeeded'),
             self.check('addonProfiles.httpApplicationRouting.enabled', True)
@@ -1140,7 +1140,7 @@ def test_aks_create_default_service_with_monitoring_addon(self, resource_group,
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 1),
             self.check('agentPoolProfiles[0].osType', 'Linux'),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('dnsPrefix', '{dns_name_prefix}'),
             self.exists('kubernetesVersion'),
             self.check('addonProfiles.omsagent.enabled', True),
@@ -1181,7 +1181,7 @@ def test_aks_create_default_service_with_monitoring_addon(self, resource_group,
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 1),
             self.check('agentPoolProfiles[0].osType', 'Linux'),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('dnsPrefix', '{dns_name_prefix}'),
             self.exists('kubernetesVersion'),
             self.check('addonProfiles.omsagent.enabled', True),
@@ -1239,7 +1239,7 @@ def test_aks_create_default_service_with_virtual_node_addon(self, resource_group
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 1),
             self.check('agentPoolProfiles[0].osType', 'Linux'),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('dnsPrefix', '{dns_name_prefix}'),
             self.exists('kubernetesVersion'),
             self.check('addonProfiles.aciConnectorLinux.enabled', True),
@@ -1275,7 +1275,7 @@ def test_aks_create_default_service_with_virtual_node_addon(self, resource_group
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 1),
             self.check('agentPoolProfiles[0].osType', 'Linux'),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('dnsPrefix', '{dns_name_prefix}'),
             self.exists('kubernetesVersion'),
             self.check('addonProfiles.aciConnectorLinux.enabled', True),
@@ -1339,7 +1339,7 @@ def test_aks_create_blb_vmas(self, resource_group, resource_group_location, sp_n
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 1),
             self.check('agentPoolProfiles[0].osType', 'Linux'),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('agentPoolProfiles[0].type', 'AvailabilitySet'),
             self.check('dnsPrefix', '{dns_name_prefix}'),
             self.exists('kubernetesVersion'),
@@ -1413,7 +1413,7 @@ def test_aks_create_default_setting(self, resource_group, resource_group_locatio
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 1),
             self.check('agentPoolProfiles[0].osType', 'Linux'),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('agentPoolProfiles[0].type', 'VirtualMachineScaleSets'),
             self.check('dnsPrefix', '{dns_name_prefix}'),
             self.exists('kubernetesVersion'),
@@ -1504,7 +1504,7 @@ def test_aks_create_slb_vmss_with_default_mgd_outbound_ip_then_update(self, reso
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 1),
             self.check('agentPoolProfiles[0].osType', 'Linux'),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('agentPoolProfiles[0].type', 'VirtualMachineScaleSets'),
             self.check('dnsPrefix', '{dns_name_prefix}'),
             self.exists('kubernetesVersion'),
@@ -1620,7 +1620,7 @@ def test_aks_create_slb_vmss_with_outbound_ip_then_update(self, resource_group,
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 1),
             self.check('agentPoolProfiles[0].osType', 'Linux'),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('agentPoolProfiles[0].type', 'VirtualMachineScaleSets'),
             self.check('dnsPrefix', '{dns_name_prefix}'),
             self.exists('kubernetesVersion'),
@@ -1727,7 +1727,7 @@ def test_aks_create_slb_vmss_with_outbound_ip_prefixes_then_update(self, resourc
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 1),
             self.check('agentPoolProfiles[0].osType', 'Linux'),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('agentPoolProfiles[0].type', 'VirtualMachineScaleSets'),
             self.check('dnsPrefix', '{dns_name_prefix}'),
             self.exists('kubernetesVersion'),
@@ -1815,7 +1815,7 @@ def test_aks_nodepool_create_scale_delete(self, resource_group, resource_group_l
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 1),
             self.check('agentPoolProfiles[0].osType', 'Linux'),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('agentPoolProfiles[0].mode', 'System'),
             self.check('dnsPrefix', '{dns_name_prefix}'),
             self.exists('kubernetesVersion')
@@ -1947,7 +1947,7 @@ def test_aks_nodepool_system_pool(self, resource_group, resource_group_location,
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 1),
             self.check('agentPoolProfiles[0].osType', 'Linux'),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('agentPoolProfiles[0].mode', 'System'),
             self.check('dnsPrefix', '{dns_name_prefix}'),
             self.exists('kubernetesVersion')
@@ -2064,7 +2064,7 @@ def test_aks_availability_zones(self, resource_group, resource_group_location, s
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 3),
             self.check('agentPoolProfiles[0].osType', 'Linux'),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('agentPoolProfiles[0].availabilityZones[0]', '1'),
             self.check('agentPoolProfiles[0].availabilityZones[1]', '2'),
             self.check('agentPoolProfiles[0].availabilityZones[2]', '3'),
@@ -2836,7 +2836,7 @@ def test_aks_managed_identity_without_service_principal(self, resource_group, re
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 1),
             self.check('agentPoolProfiles[0].osType', 'Linux'),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('dnsPrefix', '{dns_name_prefix}'),
             self.exists('kubernetesVersion'),
             self.exists('identity'),
@@ -3513,7 +3513,7 @@ def test_aks_control_plane_user_assigned_identity(self, resource_group, resource
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 1),
             self.check('agentPoolProfiles[0].osType', 'Linux'),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('dnsPrefix', '{dns_name_prefix}'),
             self.exists('kubernetesVersion'),
             self.exists('identityProfile'),
@@ -3804,7 +3804,7 @@ def test_aks_create_default_service_msi(self, resource_group, resource_group_loc
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 1),
             self.check('agentPoolProfiles[0].osType', 'Linux'),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('dnsPrefix', '{dns_name_prefix}'),
             self.check('agentPoolProfiles[0].nodeLabels.label1', 'value1'),
             self.check('agentPoolProfiles[0].nodeLabels.label2', 'value2'),
@@ -3875,7 +3875,7 @@ def test_aks_create_service_no_wait_msi(self, resource_group, resource_group_loc
             self.check('name', '{name}'),
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 1),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('dnsPrefix', '{dns_name_prefix}'),
             self.check('provisioningState', 'Succeeded'),
         ])
@@ -3909,7 +3909,7 @@ def test_aks_create_service_no_wait_msi(self, resource_group, resource_group_loc
             self.check('name', '{name}'),
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 1),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('dnsPrefix', '{dns_name_prefix}'),
             self.check('provisioningState', 'Succeeded'),
             self.check('addonProfiles.httpApplicationRouting.enabled', True)
@@ -4070,7 +4070,7 @@ def test_aks_create_default_service_with_monitoring_addon_msi(self, resource_gro
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 1),
             self.check('agentPoolProfiles[0].osType', 'Linux'),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('dnsPrefix', '{dns_name_prefix}'),
             self.exists('kubernetesVersion'),
             self.check('addonProfiles.omsagent.enabled', True),
@@ -4111,7 +4111,7 @@ def test_aks_create_default_service_with_monitoring_addon_msi(self, resource_gro
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 1),
             self.check('agentPoolProfiles[0].osType', 'Linux'),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('dnsPrefix', '{dns_name_prefix}'),
             self.exists('kubernetesVersion'),
             self.check('addonProfiles.omsagent.enabled', True),
@@ -4174,7 +4174,7 @@ def test_aks_create_blb_vmas_msi(self, resource_group, resource_group_location):
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 1),
             self.check('agentPoolProfiles[0].osType', 'Linux'),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('agentPoolProfiles[0].type', 'AvailabilitySet'),
             self.check('dnsPrefix', '{dns_name_prefix}'),
             self.exists('kubernetesVersion'),
@@ -4244,7 +4244,7 @@ def test_aks_create_default_setting_msi(self, resource_group, resource_group_loc
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 1),
             self.check('agentPoolProfiles[0].osType', 'Linux'),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('agentPoolProfiles[0].type', 'VirtualMachineScaleSets'),
             self.check('dnsPrefix', '{dns_name_prefix}'),
             self.exists('kubernetesVersion'),
@@ -4331,7 +4331,7 @@ def test_aks_create_slb_vmss_with_default_mgd_outbound_ip_then_update_msi(self,
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 1),
             self.check('agentPoolProfiles[0].osType', 'Linux'),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('agentPoolProfiles[0].type', 'VirtualMachineScaleSets'),
             self.check('dnsPrefix', '{dns_name_prefix}'),
             self.exists('kubernetesVersion'),
@@ -4443,7 +4443,7 @@ def test_aks_create_slb_vmss_with_outbound_ip_then_update_msi(self, resource_gro
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 1),
             self.check('agentPoolProfiles[0].osType', 'Linux'),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('agentPoolProfiles[0].type', 'VirtualMachineScaleSets'),
             self.check('dnsPrefix', '{dns_name_prefix}'),
             self.exists('kubernetesVersion'),
@@ -4546,7 +4546,7 @@ def test_aks_create_slb_vmss_with_outbound_ip_prefixes_then_update_msi(self, res
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 1),
             self.check('agentPoolProfiles[0].osType', 'Linux'),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('agentPoolProfiles[0].type', 'VirtualMachineScaleSets'),
             self.check('dnsPrefix', '{dns_name_prefix}'),
             self.exists('kubernetesVersion'),
@@ -4628,7 +4628,7 @@ def test_aks_nodepool_create_scale_delete_msi(self, resource_group, resource_gro
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 1),
             self.check('agentPoolProfiles[0].osType', 'Linux'),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('agentPoolProfiles[0].mode', 'System'),
             self.check('dnsPrefix', '{dns_name_prefix}'),
             self.exists('kubernetesVersion')
@@ -4750,7 +4750,7 @@ def test_aks_nodepool_system_pool_msi(self, resource_group, resource_group_locat
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 1),
             self.check('agentPoolProfiles[0].osType', 'Linux'),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('agentPoolProfiles[0].mode', 'System'),
             self.check('dnsPrefix', '{dns_name_prefix}'),
             self.exists('kubernetesVersion')
@@ -4864,7 +4864,7 @@ def test_aks_nodepool_update_label_msi(self, resource_group, resource_group_loca
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 1),
             self.check('agentPoolProfiles[0].osType', 'Linux'),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('agentPoolProfiles[0].mode', 'System'),
             self.check('dnsPrefix', '{dns_name_prefix}'),
             self.exists('kubernetesVersion')
@@ -4958,7 +4958,7 @@ def test_aks_nodepool_update_taints_msi(self, resource_group, resource_group_loc
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 1),
             self.check('agentPoolProfiles[0].osType', 'Linux'),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('agentPoolProfiles[0].mode', 'System'),
             self.check('dnsPrefix', '{dns_name_prefix}'),
             self.exists('kubernetesVersion')
@@ -5179,7 +5179,7 @@ def test_aks_nodepool_scale_down_mode(self, resource_group, resource_group_locat
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 1),
             self.check('agentPoolProfiles[0].osType', 'Linux'),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('agentPoolProfiles[0].mode', 'System'),
             self.check('dnsPrefix', '{dns_name_prefix}'),
             self.exists('kubernetesVersion')
@@ -5268,7 +5268,7 @@ def test_aks_availability_zones_msi(self, resource_group, resource_group_locatio
             self.check('resourceGroup', '{resource_group}'),
             self.check('agentPoolProfiles[0].count', 3),
             self.check('agentPoolProfiles[0].osType', 'Linux'),
-            self.check('agentPoolProfiles[0].vmSize', 'Standard_DS2_v2'),
+            self.check('agentPoolProfiles[0].vmSize', ''),
             self.check('agentPoolProfiles[0].availabilityZones[0]', '1'),
             self.check('agentPoolProfiles[0].availabilityZones[1]', '2'),
             self.check('agentPoolProfiles[0].availabilityZones[2]', '3'),