diff --git a/internal/gatewayapi/listener.go b/internal/gatewayapi/listener.go
index 2332f444dc..827e24a478 100644
--- a/internal/gatewayapi/listener.go
+++ b/internal/gatewayapi/listener.go
@@ -681,7 +681,12 @@ func (t *Translator) processAccessLog(envoyproxy *egv1a1.EnvoyProxy, resources *
 				if err != nil {
 					return nil, err
 				}
-				// TODO: remove support for Host/Port in v1.2
+
+				// EG currently support GRPC OTel only, change protocol to GRPC.
+				for _, d := range ds {
+					d.Protocol = ir.GRPC
+				}
+
 				al := &ir.OpenTelemetryAccessLog{
 					CELMatches: validExprs,
 					Resources:  sink.OpenTelemetry.Resources,
@@ -738,6 +743,13 @@ func (t *Translator) processTracing(gw *gwapiv1.Gateway, envoyproxy *egv1a1.Envo
 		return nil, err
 	}
 
+	// EG currently support OTel tracing only, change protocol to GRPC.
+	if tracing.Provider.Type == egv1a1.TracingProviderTypeOpenTelemetry {
+		for _, d := range ds {
+			d.Protocol = ir.GRPC
+		}
+	}
+
 	var authority string
 
 	// fallback to host and port
diff --git a/internal/gatewayapi/testdata/accesslog-als-backend.out.yaml b/internal/gatewayapi/testdata/accesslog-als-backend.out.yaml
index cc7e821d3d..85083533ef 100644
--- a/internal/gatewayapi/testdata/accesslog-als-backend.out.yaml
+++ b/internal/gatewayapi/testdata/accesslog-als-backend.out.yaml
@@ -168,7 +168,7 @@ xdsIR:
               name: backend-uds
               namespace: envoy-gateway
             name: accesslog_otel_0_0/backend/-1
-            protocol: TCP
+            protocol: GRPC
           - addressType: FQDN
             endpoints:
             - host: primary.foo.com
@@ -178,7 +178,7 @@ xdsIR:
               name: backend-fqdn
               namespace: envoy-gateway
             name: accesslog_otel_0_0/backend/-1
-            protocol: HTTP2
+            protocol: GRPC
           - addressType: IP
             endpoints:
             - host: 1.1.1.1
@@ -188,7 +188,7 @@ xdsIR:
               name: backend-ip
               namespace: envoy-gateway
             name: accesslog_otel_0_0/backend/-1
-            protocol: TCP
+            protocol: GRPC
         resources:
           k8s.cluster.name: cluster-1
         text: |
diff --git a/internal/gatewayapi/testdata/backendtrafficpolicy-dns-lookup-family.out.yaml b/internal/gatewayapi/testdata/backendtrafficpolicy-dns-lookup-family.out.yaml
index bcd1adcf54..c2e2c140cd 100644
--- a/internal/gatewayapi/testdata/backendtrafficpolicy-dns-lookup-family.out.yaml
+++ b/internal/gatewayapi/testdata/backendtrafficpolicy-dns-lookup-family.out.yaml
@@ -341,7 +341,7 @@ xdsIR:
               namespace: default
               sectionName: "8080"
             name: accesslog_otel_0_1/backend/-1
-            protocol: TCP
+            protocol: GRPC
         resources:
           k8s.cluster.name: cluster-1
         text: |
diff --git a/internal/gatewayapi/testdata/envoyproxy-tracing-backend-uds.out.yaml b/internal/gatewayapi/testdata/envoyproxy-tracing-backend-uds.out.yaml
index 61eeb4fbb6..82dee7608f 100644
--- a/internal/gatewayapi/testdata/envoyproxy-tracing-backend-uds.out.yaml
+++ b/internal/gatewayapi/testdata/envoyproxy-tracing-backend-uds.out.yaml
@@ -236,7 +236,7 @@ xdsIR:
             name: datadog-svc
             namespace: envoy-gateway-system
           name: tracing/backend/-1
-          protocol: TCP
+          protocol: GRPC
       provider:
         backendRefs:
         - group: gateway.envoyproxy.io
diff --git a/test/e2e/testdata/tracing-otel-custom-service-name.yaml b/test/e2e/testdata/tracing-otel-custom-service-name.yaml
index aa56c385ee..310cf3abe9 100644
--- a/test/e2e/testdata/tracing-otel-custom-service-name.yaml
+++ b/test/e2e/testdata/tracing-otel-custom-service-name.yaml
@@ -29,7 +29,7 @@ spec:
     tracing:
       provider:
         backendRefs:
-          - name: otel-collector
+          - name: my-otel-collector
             namespace: monitoring
             port: 4317
         serviceName: my-custom-service
@@ -72,3 +72,63 @@ spec:
       backendRefs:
         - name: infra-backend-v1
           port: 8080
+---
+# This's generally a copy of otel-collector service
+# with removing appProtocol from port 4317.
+# this should be worked because we assure that OpenTelemetry
+# running in GRPC.
+apiVersion: v1
+kind: Service
+metadata:
+  name: my-otel-collector
+  namespace: monitoring
+  labels:
+    helm.sh/chart: opentelemetry-collector-0.117.3
+    app.kubernetes.io/name: opentelemetry-collector
+    app.kubernetes.io/instance: gateway-addons-helm
+    app.kubernetes.io/version: "0.120.0"
+    app.kubernetes.io/managed-by: Helm
+    app.kubernetes.io/component: standalone-collector
+    component: standalone-collector
+spec:
+  type: ClusterIP
+  ports:
+
+    - name: datadog
+      port: 8126
+      targetPort: 8126
+      protocol: TCP
+    - name: envoy-als
+      port: 9000
+      targetPort: 9000
+      protocol: TCP
+      appProtocol: grpc
+    - name: jaeger-compact
+      port: 6831
+      targetPort: 6831
+      protocol: UDP
+    - name: jaeger-grpc
+      port: 14250
+      targetPort: 14250
+      protocol: TCP
+    - name: jaeger-thrift
+      port: 14268
+      targetPort: 14268
+      protocol: TCP
+    - name: otlp
+      port: 4317
+      targetPort: 4317
+      protocol: TCP
+    - name: otlp-http
+      port: 4318
+      targetPort: 4318
+      protocol: TCP
+    - name: zipkin
+      port: 9411
+      targetPort: 9411
+      protocol: TCP
+  selector:
+    app.kubernetes.io/instance: eg-addons
+    app.kubernetes.io/name: opentelemetry-collector
+    component: standalone-collector
+  internalTrafficPolicy: Cluster