diff --git a/proto/generate.go b/proto/generate.go
index 39b168e0..8a8e2458 100644
--- a/proto/generate.go
+++ b/proto/generate.go
@@ -4,4 +4,5 @@ package proto
 //go:generate protoc --go_out=./topo --go_opt=paths=source_relative ./topo.proto
 //go:generate protoc --go_out=./ceos --go_opt=paths=source_relative ./ceos.proto
 //go:generate protoc --go_out=./controller --go-grpc_out=./controller --go-grpc_opt=paths=source_relative --go_opt=paths=source_relative ./controller.proto
+//go:generate protoc --go_out=./wire --go-grpc_out=./wire --go-grpc_opt=paths=source_relative --go_opt=paths=source_relative ./wire.proto
 //go:generate protoc --go_out=./event --go-grpc_out=./event --go-grpc_opt=paths=source_relative --go_opt=paths=source_relative ./event.proto
diff --git a/proto/topo.proto b/proto/topo.proto
index edcd1998..8080196e 100644
--- a/proto/topo.proto
+++ b/proto/topo.proto
@@ -43,6 +43,7 @@ enum Vendor {
   OPENCONFIG = 10;
   ALPINE = 11;
   DRIVENETS = 12;
+  EXTERNAL = 13;
 }
 
 // Node is a single container inside the topology
diff --git a/proto/topo/topo.pb.go b/proto/topo/topo.pb.go
index 7e1aa954..1a904e3b 100644
--- a/proto/topo/topo.pb.go
+++ b/proto/topo/topo.pb.go
@@ -53,6 +53,7 @@ const (
 	Vendor_OPENCONFIG Vendor = 10
 	Vendor_ALPINE     Vendor = 11
 	Vendor_DRIVENETS  Vendor = 12
+	Vendor_EXTERNAL   Vendor = 13
 )
 
 // Enum value maps for Vendor.
@@ -71,6 +72,7 @@ var (
 		10: "OPENCONFIG",
 		11: "ALPINE",
 		12: "DRIVENETS",
+		13: "EXTERNAL",
 	}
 	Vendor_value = map[string]int32{
 		"UNKNOWN":    0,
@@ -86,6 +88,7 @@ var (
 		"OPENCONFIG": 10,
 		"ALPINE":     11,
 		"DRIVENETS":  12,
+		"EXTERNAL":   13,
 	}
 )
 
@@ -1471,7 +1474,7 @@ var file_topo_proto_rawDesc = []byte{
 	0x08, 0x69, 0x6e, 0x73, 0x69, 0x64, 0x65, 0x49, 0x70, 0x12, 0x1b, 0x0a, 0x09, 0x6e, 0x6f, 0x64,
 	0x65, 0x5f, 0x70, 0x6f, 0x72, 0x74, 0x18, 0x06, 0x20, 0x01, 0x28, 0x0d, 0x52, 0x08, 0x6e, 0x6f,
 	0x64, 0x65, 0x50, 0x6f, 0x72, 0x74, 0x12, 0x14, 0x0a, 0x05, 0x6e, 0x61, 0x6d, 0x65, 0x73, 0x18,
-	0x07, 0x20, 0x03, 0x28, 0x09, 0x52, 0x05, 0x6e, 0x61, 0x6d, 0x65, 0x73, 0x2a, 0xa7, 0x01, 0x0a,
+	0x07, 0x20, 0x03, 0x28, 0x09, 0x52, 0x05, 0x6e, 0x61, 0x6d, 0x65, 0x73, 0x2a, 0xb5, 0x01, 0x0a,
 	0x06, 0x56, 0x65, 0x6e, 0x64, 0x6f, 0x72, 0x12, 0x0b, 0x0a, 0x07, 0x55, 0x4e, 0x4b, 0x4e, 0x4f,
 	0x57, 0x4e, 0x10, 0x00, 0x12, 0x08, 0x0a, 0x04, 0x48, 0x4f, 0x53, 0x54, 0x10, 0x01, 0x12, 0x0a,
 	0x0a, 0x06, 0x41, 0x52, 0x49, 0x53, 0x54, 0x41, 0x10, 0x02, 0x12, 0x09, 0x0a, 0x05, 0x43, 0x49,
@@ -1482,10 +1485,11 @@ var file_topo_proto_rawDesc = []byte{
 	0x12, 0x09, 0x0a, 0x05, 0x4e, 0x4f, 0x4b, 0x49, 0x41, 0x10, 0x09, 0x12, 0x0e, 0x0a, 0x0a, 0x4f,
 	0x50, 0x45, 0x4e, 0x43, 0x4f, 0x4e, 0x46, 0x49, 0x47, 0x10, 0x0a, 0x12, 0x0a, 0x0a, 0x06, 0x41,
 	0x4c, 0x50, 0x49, 0x4e, 0x45, 0x10, 0x0b, 0x12, 0x0d, 0x0a, 0x09, 0x44, 0x52, 0x49, 0x56, 0x45,
-	0x4e, 0x45, 0x54, 0x53, 0x10, 0x0c, 0x42, 0x26, 0x5a, 0x24, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62,
-	0x2e, 0x63, 0x6f, 0x6d, 0x2f, 0x6f, 0x70, 0x65, 0x6e, 0x63, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x2f,
-	0x6b, 0x6e, 0x65, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2f, 0x74, 0x6f, 0x70, 0x6f, 0x62, 0x06,
-	0x70, 0x72, 0x6f, 0x74, 0x6f, 0x33,
+	0x4e, 0x45, 0x54, 0x53, 0x10, 0x0c, 0x12, 0x0c, 0x0a, 0x08, 0x45, 0x58, 0x54, 0x45, 0x52, 0x4e,
+	0x41, 0x4c, 0x10, 0x0d, 0x42, 0x26, 0x5a, 0x24, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63,
+	0x6f, 0x6d, 0x2f, 0x6f, 0x70, 0x65, 0x6e, 0x63, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x2f, 0x6b, 0x6e,
+	0x65, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2f, 0x74, 0x6f, 0x70, 0x6f, 0x62, 0x06, 0x70, 0x72,
+	0x6f, 0x74, 0x6f, 0x33,
 }
 
 var (
diff --git a/proto/wire.proto b/proto/wire.proto
new file mode 100644
index 00000000..d6187cc8
--- /dev/null
+++ b/proto/wire.proto
@@ -0,0 +1,27 @@
+// Copyright 2024 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+syntax = "proto3";
+
+package wire;
+
+option go_package = "github.com/openconfig/kne/proto/wire";
+
+// Wire service definition.
+service Wire {
+	rpc Transmit(stream Packet) returns (stream Packet);
+}
+
+message Packet {
+	bytes data = 1;
+}
diff --git a/proto/wire/wire.pb.go b/proto/wire/wire.pb.go
new file mode 100644
index 00000000..01b5c721
--- /dev/null
+++ b/proto/wire/wire.pb.go
@@ -0,0 +1,162 @@
+// Copyright 2024 Google LLC
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// Code generated by protoc-gen-go. DO NOT EDIT.
+// versions:
+// 	protoc-gen-go v1.28.1
+// 	protoc        v3.21.12
+// source: wire.proto
+
+package wire
+
+import (
+	protoreflect "google.golang.org/protobuf/reflect/protoreflect"
+	protoimpl "google.golang.org/protobuf/runtime/protoimpl"
+	reflect "reflect"
+	sync "sync"
+)
+
+const (
+	// Verify that this generated code is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(20 - protoimpl.MinVersion)
+	// Verify that runtime/protoimpl is sufficiently up-to-date.
+	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
+)
+
+type Packet struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Data []byte `protobuf:"bytes,1,opt,name=data,proto3" json:"data,omitempty"`
+}
+
+func (x *Packet) Reset() {
+	*x = Packet{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_wire_proto_msgTypes[0]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *Packet) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*Packet) ProtoMessage() {}
+
+func (x *Packet) ProtoReflect() protoreflect.Message {
+	mi := &file_wire_proto_msgTypes[0]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use Packet.ProtoReflect.Descriptor instead.
+func (*Packet) Descriptor() ([]byte, []int) {
+	return file_wire_proto_rawDescGZIP(), []int{0}
+}
+
+func (x *Packet) GetData() []byte {
+	if x != nil {
+		return x.Data
+	}
+	return nil
+}
+
+var File_wire_proto protoreflect.FileDescriptor
+
+var file_wire_proto_rawDesc = []byte{
+	0x0a, 0x0a, 0x77, 0x69, 0x72, 0x65, 0x2e, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x12, 0x04, 0x77, 0x69,
+	0x72, 0x65, 0x22, 0x1c, 0x0a, 0x06, 0x50, 0x61, 0x63, 0x6b, 0x65, 0x74, 0x12, 0x12, 0x0a, 0x04,
+	0x64, 0x61, 0x74, 0x61, 0x18, 0x01, 0x20, 0x01, 0x28, 0x0c, 0x52, 0x04, 0x64, 0x61, 0x74, 0x61,
+	0x32, 0x32, 0x0a, 0x04, 0x57, 0x69, 0x72, 0x65, 0x12, 0x2a, 0x0a, 0x08, 0x54, 0x72, 0x61, 0x6e,
+	0x73, 0x6d, 0x69, 0x74, 0x12, 0x0c, 0x2e, 0x77, 0x69, 0x72, 0x65, 0x2e, 0x50, 0x61, 0x63, 0x6b,
+	0x65, 0x74, 0x1a, 0x0c, 0x2e, 0x77, 0x69, 0x72, 0x65, 0x2e, 0x50, 0x61, 0x63, 0x6b, 0x65, 0x74,
+	0x28, 0x01, 0x30, 0x01, 0x42, 0x26, 0x5a, 0x24, 0x67, 0x69, 0x74, 0x68, 0x75, 0x62, 0x2e, 0x63,
+	0x6f, 0x6d, 0x2f, 0x6f, 0x70, 0x65, 0x6e, 0x63, 0x6f, 0x6e, 0x66, 0x69, 0x67, 0x2f, 0x6b, 0x6e,
+	0x65, 0x2f, 0x70, 0x72, 0x6f, 0x74, 0x6f, 0x2f, 0x77, 0x69, 0x72, 0x65, 0x62, 0x06, 0x70, 0x72,
+	0x6f, 0x74, 0x6f, 0x33,
+}
+
+var (
+	file_wire_proto_rawDescOnce sync.Once
+	file_wire_proto_rawDescData = file_wire_proto_rawDesc
+)
+
+func file_wire_proto_rawDescGZIP() []byte {
+	file_wire_proto_rawDescOnce.Do(func() {
+		file_wire_proto_rawDescData = protoimpl.X.CompressGZIP(file_wire_proto_rawDescData)
+	})
+	return file_wire_proto_rawDescData
+}
+
+var file_wire_proto_msgTypes = make([]protoimpl.MessageInfo, 1)
+var file_wire_proto_goTypes = []interface{}{
+	(*Packet)(nil), // 0: wire.Packet
+}
+var file_wire_proto_depIdxs = []int32{
+	0, // 0: wire.Wire.Transmit:input_type -> wire.Packet
+	0, // 1: wire.Wire.Transmit:output_type -> wire.Packet
+	1, // [1:2] is the sub-list for method output_type
+	0, // [0:1] is the sub-list for method input_type
+	0, // [0:0] is the sub-list for extension type_name
+	0, // [0:0] is the sub-list for extension extendee
+	0, // [0:0] is the sub-list for field type_name
+}
+
+func init() { file_wire_proto_init() }
+func file_wire_proto_init() {
+	if File_wire_proto != nil {
+		return
+	}
+	if !protoimpl.UnsafeEnabled {
+		file_wire_proto_msgTypes[0].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*Packet); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+	}
+	type x struct{}
+	out := protoimpl.TypeBuilder{
+		File: protoimpl.DescBuilder{
+			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
+			RawDescriptor: file_wire_proto_rawDesc,
+			NumEnums:      0,
+			NumMessages:   1,
+			NumExtensions: 0,
+			NumServices:   1,
+		},
+		GoTypes:           file_wire_proto_goTypes,
+		DependencyIndexes: file_wire_proto_depIdxs,
+		MessageInfos:      file_wire_proto_msgTypes,
+	}.Build()
+	File_wire_proto = out.File
+	file_wire_proto_rawDesc = nil
+	file_wire_proto_goTypes = nil
+	file_wire_proto_depIdxs = nil
+}
diff --git a/proto/wire/wire_grpc.pb.go b/proto/wire/wire_grpc.pb.go
new file mode 100644
index 00000000..e455d063
--- /dev/null
+++ b/proto/wire/wire_grpc.pb.go
@@ -0,0 +1,137 @@
+// Code generated by protoc-gen-go-grpc. DO NOT EDIT.
+// versions:
+// - protoc-gen-go-grpc v1.2.0
+// - protoc             v3.21.12
+// source: wire.proto
+
+package wire
+
+import (
+	context "context"
+	grpc "google.golang.org/grpc"
+	codes "google.golang.org/grpc/codes"
+	status "google.golang.org/grpc/status"
+)
+
+// This is a compile-time assertion to ensure that this generated file
+// is compatible with the grpc package it is being compiled against.
+// Requires gRPC-Go v1.32.0 or later.
+const _ = grpc.SupportPackageIsVersion7
+
+// WireClient is the client API for Wire service.
+//
+// For semantics around ctx use and closing/ending streaming RPCs, please refer to https://pkg.go.dev/google.golang.org/grpc/?tab=doc#ClientConn.NewStream.
+type WireClient interface {
+	Transmit(ctx context.Context, opts ...grpc.CallOption) (Wire_TransmitClient, error)
+}
+
+type wireClient struct {
+	cc grpc.ClientConnInterface
+}
+
+func NewWireClient(cc grpc.ClientConnInterface) WireClient {
+	return &wireClient{cc}
+}
+
+func (c *wireClient) Transmit(ctx context.Context, opts ...grpc.CallOption) (Wire_TransmitClient, error) {
+	stream, err := c.cc.NewStream(ctx, &Wire_ServiceDesc.Streams[0], "/wire.Wire/Transmit", opts...)
+	if err != nil {
+		return nil, err
+	}
+	x := &wireTransmitClient{stream}
+	return x, nil
+}
+
+type Wire_TransmitClient interface {
+	Send(*Packet) error
+	Recv() (*Packet, error)
+	grpc.ClientStream
+}
+
+type wireTransmitClient struct {
+	grpc.ClientStream
+}
+
+func (x *wireTransmitClient) Send(m *Packet) error {
+	return x.ClientStream.SendMsg(m)
+}
+
+func (x *wireTransmitClient) Recv() (*Packet, error) {
+	m := new(Packet)
+	if err := x.ClientStream.RecvMsg(m); err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
+// WireServer is the server API for Wire service.
+// All implementations must embed UnimplementedWireServer
+// for forward compatibility
+type WireServer interface {
+	Transmit(Wire_TransmitServer) error
+	mustEmbedUnimplementedWireServer()
+}
+
+// UnimplementedWireServer must be embedded to have forward compatible implementations.
+type UnimplementedWireServer struct {
+}
+
+func (UnimplementedWireServer) Transmit(Wire_TransmitServer) error {
+	return status.Errorf(codes.Unimplemented, "method Transmit not implemented")
+}
+func (UnimplementedWireServer) mustEmbedUnimplementedWireServer() {}
+
+// UnsafeWireServer may be embedded to opt out of forward compatibility for this service.
+// Use of this interface is not recommended, as added methods to WireServer will
+// result in compilation errors.
+type UnsafeWireServer interface {
+	mustEmbedUnimplementedWireServer()
+}
+
+func RegisterWireServer(s grpc.ServiceRegistrar, srv WireServer) {
+	s.RegisterService(&Wire_ServiceDesc, srv)
+}
+
+func _Wire_Transmit_Handler(srv interface{}, stream grpc.ServerStream) error {
+	return srv.(WireServer).Transmit(&wireTransmitServer{stream})
+}
+
+type Wire_TransmitServer interface {
+	Send(*Packet) error
+	Recv() (*Packet, error)
+	grpc.ServerStream
+}
+
+type wireTransmitServer struct {
+	grpc.ServerStream
+}
+
+func (x *wireTransmitServer) Send(m *Packet) error {
+	return x.ServerStream.SendMsg(m)
+}
+
+func (x *wireTransmitServer) Recv() (*Packet, error) {
+	m := new(Packet)
+	if err := x.ServerStream.RecvMsg(m); err != nil {
+		return nil, err
+	}
+	return m, nil
+}
+
+// Wire_ServiceDesc is the grpc.ServiceDesc for Wire service.
+// It's only intended for direct use with grpc.RegisterService,
+// and not to be introspected or modified (even as a copy)
+var Wire_ServiceDesc = grpc.ServiceDesc{
+	ServiceName: "wire.Wire",
+	HandlerType: (*WireServer)(nil),
+	Methods:     []grpc.MethodDesc{},
+	Streams: []grpc.StreamDesc{
+		{
+			StreamName:    "Transmit",
+			Handler:       _Wire_Transmit_Handler,
+			ServerStreams: true,
+			ClientStreams: true,
+		},
+	},
+	Metadata: "wire.proto",
+}
diff --git a/wire/client/client b/wire/client/client
new file mode 100755
index 00000000..cdb59123
Binary files /dev/null and b/wire/client/client differ
diff --git a/wire/client/main.go b/wire/client/main.go
new file mode 100644
index 00000000..9e550d47
--- /dev/null
+++ b/wire/client/main.go
@@ -0,0 +1,65 @@
+package main
+
+import (
+	"context"
+	"flag"
+	"io"
+	"fmt"
+
+	log "github.com/golang/glog"
+	wpb "github.com/openconfig/kne/proto/wire"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/metadata"
+	"google.golang.org/grpc/credentials/insecure"
+)
+
+var (
+	addr = flag.String("addr", "localhost:50058", "Wire server address")
+)
+
+func main() {
+	ctx := context.Background()
+	opts := []grpc.DialOption{
+		grpc.WithTransportCredentials(insecure.NewCredentials()),
+	}
+	conn, err := grpc.DialContext(ctx, *addr, opts...)
+	if err != nil {
+		log.Fatalf("Failed to dial %q: %v", *addr, err)
+	}
+	defer conn.Close()
+	c := wpb.NewWireClient(conn)
+	mctx := metadata.NewOutgoingContext(ctx, metadata.New(map[string]string{
+		"device": "xx01.sql17",
+		"intf": "HundredGigE0/0/0/0",
+	}))
+	stream, err := c.Transmit(mctx)
+	waitc := make(chan struct{})
+	if err != nil {
+		log.Fatalf("Failed to create transmit stream: %v", err)
+	}
+	go func() {
+		for {
+    			in, err := stream.Recv()
+    			if err == io.EOF {
+      				// read done.
+      				close(waitc)
+      				return
+    			}
+    			if err != nil {
+      				log.Fatalf("Failed to receive a packet: %v", err)
+    			}
+			log.Infof("Recv packet: %v", in.Data)
+  		}
+	}()
+	for i := 0; i < 10; i++ {
+		p := &wpb.Packet{
+			Data:   []byte(fmt.Sprintf("packet %v", i)),
+		}
+		if err := stream.Send(p); err != nil {
+			log.Fatalf("Failed to send packet %v: %v", i, err)
+		}
+		log.Infof("Sent packet: %v", p.Data)
+	}
+	stream.CloseSend()
+	<-waitc
+}
diff --git a/wire/main.go b/wire/main.go
new file mode 100644
index 00000000..b33f208e
--- /dev/null
+++ b/wire/main.go
@@ -0,0 +1,65 @@
+package main
+
+import (
+	"flag"
+	"fmt"
+	"net"
+	"io"
+
+	log "github.com/golang/glog"
+	wpb "github.com/openconfig/kne/proto/wire"
+	"google.golang.org/grpc"
+	"google.golang.org/grpc/metadata"
+)
+
+var (
+	port = flag.Int("port", 50058, "Wire server port")
+)
+
+type server struct {
+	wpb.UnimplementedWireServer
+}
+
+func newServer() *server {
+	return &server{}
+}
+
+func (s *server) Transmit(stream wpb.Wire_TransmitServer) error {
+	log.Infof("New Transmit stream started")
+	md, ok := metadata.FromIncomingContext(stream.Context())
+	if !ok {
+		log.Infof("Missing metadata")
+		return fmt.Errorf("missing metadata")
+	}
+	log.Infof("Got metadata: %v", md)
+	for {
+		in, err := stream.Recv()
+		if err == io.EOF {
+			return nil
+		}
+		if err != nil {
+			return err
+		}
+		log.Infof("Recv packet: %v", string(in.Data))
+		if err := stream.Send(in); err != nil {
+			return err
+		}
+		log.Infof("Sent packet: %v", string(in.Data))
+	}
+	return nil
+}
+
+func main() {
+	flag.Parse()
+	addr := fmt.Sprintf(":%d", *port)
+	lis, err := net.Listen("tcp6", addr)
+	if err != nil {
+		log.Fatalf("failed to listen: %v", err)
+	}
+	s := grpc.NewServer()
+	wpb.RegisterWireServer(s, newServer())
+	log.Infof("Wire server listening at %v", lis.Addr())
+	if err := s.Serve(lis); err != nil {
+		log.Fatalf("failed to serve: %v", err)
+	}
+}
diff --git a/wire/wire b/wire/wire
new file mode 100755
index 00000000..9a8b1fc3
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