diff --git a/google/cloud/networkmanagement/v1/connectivity_test.proto b/google/cloud/networkmanagement/v1/connectivity_test.proto
index 30fdfc0b9ef94..fc4a7d32b7891 100644
--- a/google/cloud/networkmanagement/v1/connectivity_test.proto
+++ b/google/cloud/networkmanagement/v1/connectivity_test.proto
@@ -148,6 +148,14 @@ message Endpoint {
   // A Compute Engine instance URI.
   string instance = 3;
 
+  // A forwarding rule and its corresponding IP address represent the frontend
+  // configuration of a Google Cloud load balancer. Forwarding rules are also
+  // used for protocol forwarding, Private Service Connect and other network
+  // services to provide forwarding information in the control plane. Format:
+  //  projects/{project}/global/forwardingRules/{id} or
+  //  projects/{project}/regions/{region}/forwardingRules/{id}
+  string forwarding_rule = 13;
+
   // A cluster URI for [Google Kubernetes Engine
   // master](https://cloud.google.com/kubernetes-engine/docs/concepts/cluster-architecture).
   string gke_master_cluster = 7;
diff --git a/google/cloud/networkmanagement/v1beta1/connectivity_test.proto b/google/cloud/networkmanagement/v1beta1/connectivity_test.proto
index c4fa6ca14acd8..fa33a07764be1 100644
--- a/google/cloud/networkmanagement/v1beta1/connectivity_test.proto
+++ b/google/cloud/networkmanagement/v1beta1/connectivity_test.proto
@@ -162,6 +162,14 @@ message Endpoint {
   // A Compute Engine instance URI.
   string instance = 3;
 
+  // A forwarding rule and its corresponding IP address represent the frontend
+  // configuration of a Google Cloud load balancer. Forwarding rules are also
+  // used for protocol forwarding, Private Service Connect and other network
+  // services to provide forwarding information in the control plane. Format:
+  //  projects/{project}/global/forwardingRules/{id} or
+  //  projects/{project}/regions/{region}/forwardingRules/{id}
+  string forwarding_rule = 13;
+
   // A cluster URI for [Google Kubernetes Engine
   // master](https://cloud.google.com/kubernetes-engine/docs/concepts/cluster-architecture).
   string gke_master_cluster = 7;