diff --git a/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/ExpressRoutePortCreate.json b/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/ExpressRoutePortCreate.json
index 47a777bd8abc..b93634b919db 100644
--- a/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/ExpressRoutePortCreate.json
+++ b/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/ExpressRoutePortCreate.json
@@ -9,6 +9,7 @@
       "properties": {
         "peeringLocation": "peeringLocationName",
         "bandwidthInGbps": 100,
+        "billingType": "UnlimitedData",
         "encapsulation": "QinQ"
       }
     }
@@ -22,6 +23,7 @@
         "location": "westus",
         "properties": {
           "provisioningState": "Succeeded",
+          "billingType": "UnlimitedData",
           "peeringLocation": "peeringLocationName",
           "bandwidthInGbps": 100,
           "provisionedBandwidthInGbps": 0.0,
@@ -69,6 +71,7 @@
         "location": "westus",
         "properties": {
           "provisioningState": "Succeeded",
+          "billingType": "UnlimitedData",
           "peeringLocation": "peeringLocationName",
           "bandwidthInGbps": 100,
           "provisionedBandwidthInGbps": 0.0,
diff --git a/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/ExpressRoutePortGet.json b/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/ExpressRoutePortGet.json
index ea5d3cb27755..c856cef10884 100644
--- a/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/ExpressRoutePortGet.json
+++ b/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/ExpressRoutePortGet.json
@@ -14,6 +14,7 @@
         "location": "westus",
         "properties": {
           "provisioningState": "Succeeded",
+          "billingType": "UnlimitedData",
           "peeringLocation": "peeringLocationName",
           "bandwidthInGbps": 100,
           "provisionedBandwidthInGbps": 0.0,
diff --git a/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/ExpressRoutePortList.json b/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/ExpressRoutePortList.json
index 4c26b8340cdd..2026ddd5b108 100644
--- a/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/ExpressRoutePortList.json
+++ b/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/ExpressRoutePortList.json
@@ -14,6 +14,7 @@
             "location": "westus",
             "properties": {
               "provisioningState": "Succeeded",
+              "billingType": "UnlimitedData",
               "peeringLocation": "peeringLocationName",
               "bandwidthInGbps": 100,
               "provisionedBandwidthInGbps": 0.0,
diff --git a/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/ExpressRoutePortListByResourceGroup.json b/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/ExpressRoutePortListByResourceGroup.json
index 998cd7c9e8d1..0a5dfcfc9275 100644
--- a/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/ExpressRoutePortListByResourceGroup.json
+++ b/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/ExpressRoutePortListByResourceGroup.json
@@ -15,6 +15,7 @@
             "location": "westus",
             "properties": {
               "provisioningState": "Succeeded",
+              "billingType": "UnlimitedData",
               "peeringLocation": "peeringLocationName",
               "bandwidthInGbps": 100,
               "provisionedBandwidthInGbps": 0.0,
diff --git a/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/ExpressRoutePortUpdateLink.json b/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/ExpressRoutePortUpdateLink.json
index a7accc6cd39c..a6f377fc0629 100644
--- a/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/ExpressRoutePortUpdateLink.json
+++ b/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/ExpressRoutePortUpdateLink.json
@@ -8,6 +8,7 @@
       "location": "westus",
       "properties": {
         "peeringLocation": "peeringLocationName",
+        "billingType": "UnlimitedData",
         "bandwidthInGbps": 100,
         "encapsulation": "QinQ",
         "links": [
@@ -30,6 +31,7 @@
         "location": "westus",
         "properties": {
           "provisioningState": "Succeeded",
+          "billingType": "UnlimitedData",
           "peeringLocation": "peeringLocationName",
           "bandwidthInGbps": 100,
           "provisionedBandwidthInGbps": 0.0,
diff --git a/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/ExpressRoutePortUpdateTags.json b/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/ExpressRoutePortUpdateTags.json
index 4adece1ed1db..3463fbdd99b6 100644
--- a/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/ExpressRoutePortUpdateTags.json
+++ b/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/examples/ExpressRoutePortUpdateTags.json
@@ -20,6 +20,7 @@
         "location": "westus",
         "properties": {
           "provisioningState": "Succeeded",
+          "billingType": "UnlimitedData",
           "peeringLocation": "peeringLocationName",
           "bandwidthInGbps": 100,
           "provisionedBandwidthInGbps": 0.0,
diff --git a/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/expressRoutePort.json b/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/expressRoutePort.json
index 336068d2ab51..0defc3f6b735 100644
--- a/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/expressRoutePort.json
+++ b/specification/network/resource-manager/Microsoft.Network/stable/2021-08-01/expressRoutePort.json
@@ -893,6 +893,18 @@
           "readOnly": true,
           "type": "string",
           "description": "The resource GUID property of the express route port resource."
+        },
+        "billingType": {
+          "type": "string",
+          "description": "The billing type of the ExpressRoutePort resource.",
+          "enum": [
+            "UnlimitedData",
+            "MeteredData"
+          ],
+          "x-ms-enum": {
+            "name": "ExpressRoutePortsBillingType",
+            "modelAsString": true
+          }
         }
       }
     },