diff --git a/internal/pkg/core/l2oam/msg_l2switching_domain_action_lnlet_entry.go b/internal/pkg/core/l2oam/msg_l2switching_domain_action_lnlet_entry.go
new file mode 100644
index 0000000..b826292
--- /dev/null
+++ b/internal/pkg/core/l2oam/msg_l2switching_domain_action_lnlet_entry.go
@@ -0,0 +1,215 @@
+/*
+ * Copyright 2020-present Open Networking Foundation
+
+ * 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.
+ */
+
+package l2oam
+
+import (
+	"encoding/binary"
+	"encoding/hex"
+	"fmt"
+
+	"github.com/google/gopacket"
+	"github.com/google/gopacket/layers"
+)
+
+// L2switchingDomainRequest is a structure for a request of "L2 Switching Domain/Action Inlet entry" message
+type L2switchingDomainRequest struct {
+	layers.BaseLayer
+	Opcode uint8
+	Flags      uint16
+	OAMPDUCode uint8
+	OUId       []byte // Organizationally Unique Identifier: 2a:ea:15 (Tibit Communications)
+	TOMIOpcode uint8
+	CTBranch   uint8
+	CTType     uint16
+	CTLength   uint8
+	CTInstance uint32
+	OCBranch   uint8
+	OCType     uint16
+	OCLength   uint8
+	OCInstance uint32
+	VcBranch uint8
+	VcLeaf   uint16
+	VcLength uint8
+	SOLength    uint8
+	SOBranch    uint8
+	SOType      uint16
+	SOValLength uint8
+	SOInstance  uint8
+	TMLLength uint8
+	TMLList   []TpidVid
+	TOPopLength uint8
+	TOPopValue  uint8
+	TOSLength uint8
+	TOSList   []TpidVid
+	TOPushLength uint8
+	TOPushList   []TpidVid
+	EndBranch  uint8
+	SizeMargin uint8
+}
+
+// TpidVid is a structure for TPID/VID set
+type TpidVid struct {
+	Length     uint8
+	TpIDLength uint8
+	TpIDValue  []byte
+	VIdLength  uint8
+	VIdValue   []byte
+}
+
+// String returns the string expression of L2switchingDomainRequest
+func (d *L2switchingDomainRequest) String() string {
+	message := fmt.Sprintf("Opcode:%x, Flags:%x, OAMPDUCode:%x, OUId:%v", d.Opcode, d.Flags, d.OAMPDUCode, hex.EncodeToString(d.OUId))
+	message = fmt.Sprintf("%s, TOMIOpcode:%x", message, d.TOMIOpcode)
+	message = fmt.Sprintf("%s, CTBranch:%x, CTType:%x, CTLength:%x, CTInstance:%x", message, d.CTBranch, d.CTType, d.CTLength, d.CTInstance)
+	message = fmt.Sprintf("%s, OCBranch:%x, OCType:%x, OCLength:%x, OCInstance:%x", message, d.OCBranch, d.OCType, d.OCLength, d.OCInstance)
+	message = fmt.Sprintf("%s, VcBranch:%x, VcLeaf:%x, VcLength:%x", message, d.VcBranch, d.VcLeaf, d.VcLength)
+	message = fmt.Sprintf("%s, SOLength:%x, SOBranch:%x, SOType:%x, SOValLength:%x, SOInstance:%x", message, d.SOLength, d.SOBranch, d.SOType, d.SOValLength, d.SOInstance)
+	message = fmt.Sprintf("%s, TMLLength:%x", message, d.TMLLength)
+	for i, tagMatch := range d.TMLList {
+		message = fmt.Sprintf("%s, %s", message, stringToTpidVid(&tagMatch, i))
+	}
+	message = fmt.Sprintf("%s, TOPopLength:%x, TOPopValue:%x", message, d.TOPopLength, d.TOPopValue)
+	message = fmt.Sprintf("%s, TOSLength:%x", message, d.TOSLength)
+	for i, tagOpSet := range d.TOSList {
+		message = fmt.Sprintf("%s, %s", message, stringToTpidVid(&tagOpSet, i))
+	}
+	message = fmt.Sprintf("%s, TOPushLength:%x", message, d.TOPushLength)
+	for i, tagOpPush := range d.TOPushList {
+		message = fmt.Sprintf("%s, %s", message, stringToTpidVid(&tagOpPush, i))
+	}
+	return message
+}
+
+func stringToTpidVid(tpidVid *TpidVid, index int) string {
+	message := fmt.Sprintf("EC[%v]:{Length:%x, TpIdLength:%x", index, tpidVid.Length, tpidVid.TpIDLength)
+	if tpidVid.TpIDLength != 128 {
+		message = fmt.Sprintf("%s, TpIdValue:%v", message, hex.EncodeToString(tpidVid.TpIDValue))
+	}
+	message = fmt.Sprintf("%s, VIdLength:%x", message, tpidVid.VIdLength)
+	if tpidVid.VIdLength != 128 {
+		message = fmt.Sprintf("%s, VIdValue:%v", message, hex.EncodeToString(tpidVid.VIdValue))
+	}
+	message = fmt.Sprintf("%s}", message)
+	return message
+}
+
+// Len returns the length of L2switchingDomainRequest
+func (d *L2switchingDomainRequest) Len() int {
+	return 22 + int(d.CTLength) + int(d.OCLength) + int(d.VcLength) + int(d.SizeMargin)
+}
+
+// LayerType returns the ethernet type of L2switchingDomainRequest
+func (d *L2switchingDomainRequest) LayerType() gopacket.LayerType { return layers.LayerTypeEthernet }
+
+// SerializeTo serializes a data structure to byte arrays
+func (d *L2switchingDomainRequest) SerializeTo(b gopacket.SerializeBuffer, opts gopacket.SerializeOptions) error {
+	plen := int(d.Len())
+	data, err := b.PrependBytes(plen)
+	if err != nil {
+		return err
+	}
+
+	i := 0
+	data[i] = byte(d.Opcode)
+	i++
+	binary.BigEndian.PutUint16(data[i:i+2], d.Flags)
+	i += 2
+	data[i] = byte(d.OAMPDUCode)
+	i++
+	copy(data[i:i+len(d.OUId)], d.OUId)
+	i += len(d.OUId)
+	data[i] = byte(d.TOMIOpcode)
+	i++
+	data[i] = byte(d.CTBranch)
+	i++
+	binary.BigEndian.PutUint16(data[i:i+2], d.CTType)
+	i += 2
+	data[i] = byte(d.CTLength)
+	i++
+	binary.BigEndian.PutUint32(data[i:i+4], d.CTInstance)
+	i += 4
+	data[i] = byte(d.OCBranch)
+	i++
+	binary.BigEndian.PutUint16(data[i:i+2], d.OCType)
+	i += 2
+	data[i] = byte(d.OCLength)
+	i++
+	binary.BigEndian.PutUint32(data[i:i+4], d.OCInstance)
+	i += 4
+	data[i] = byte(d.VcBranch)
+	i++
+	binary.BigEndian.PutUint16(data[i:i+2], d.VcLeaf)
+	i += 2
+	data[i] = byte(d.VcLength)
+	i++
+	data[i] = byte(d.SOLength)
+	i++
+	data[i] = byte(d.SOBranch)
+	i++
+	binary.BigEndian.PutUint16(data[i:i+2], d.SOType)
+	i += 2
+	data[i] = byte(d.SOValLength)
+	i++
+	data[i] = byte(d.SOInstance)
+	i++
+	data[i] = byte(d.TMLLength)
+	i++
+	for _, tagMatch := range d.TMLList {
+		nextIndex := serializeTpidVid(&tagMatch, data, i)
+		i = nextIndex
+	}
+	data[i] = byte(d.TOPopLength)
+	i++
+	data[i] = byte(d.TOPopValue)
+	i++
+	data[i] = byte(d.TOSLength)
+	i++
+	for _, tagOpSet := range d.TOSList {
+		nextIndex := serializeTpidVid(&tagOpSet, data, i)
+		i = nextIndex
+	}
+	data[i] = d.TOPushLength
+	i++
+	for _, tagOpPush := range d.TOPushList {
+		nextIndex := serializeTpidVid(&tagOpPush, data, i)
+		i = nextIndex
+	}
+	data[i] = byte(d.EndBranch)
+
+	return nil
+}
+
+func serializeTpidVid(tpidVid *TpidVid, data []byte, startIndex int) int {
+	i := startIndex
+	data[i] = tpidVid.Length
+	i++
+	ln := tpidVid.TpIDLength
+	data[i] = ln
+	i++
+	if ln != 128 { // !Empty?
+		copy(data[i:i+int(ln)], tpidVid.TpIDValue)
+		i += int(ln)
+	}
+	ln = tpidVid.VIdLength
+	data[i] = ln
+	i++
+	if ln != 128 { // !Empty?
+		copy(data[i:i+int(ln)], tpidVid.VIdValue)
+		i += int(ln)
+	}
+	return i
+}