diff --git a/MdeModulePkg/Universal/Network/SnpDxe/Start.c b/MdeModulePkg/Universal/Network/SnpDxe/Start.c
new file mode 100644
index 0000000000..eaba03c57d
--- /dev/null
+++ b/MdeModulePkg/Universal/Network/SnpDxe/Start.c
@@ -0,0 +1,175 @@
+/** @file
+Copyright (c) 2004 - 2007, Intel Corporation
+All rights reserved. This program and the accompanying materials
+are licensed and made available under the terms and conditions of the BSD License
+which accompanies this distribution.  The full text of the license may be found at
+http://opensource.org/licenses/bsd-license.php
+
+THE PROGRAM IS DISTRIBUTED UNDER THE BSD LICENSE ON AN "AS IS" BASIS,
+WITHOUT WARRANTIES OR REPRESENTATIONS OF ANY KIND, EITHER EXPRESS OR IMPLIED.
+
+Module name:
+  start.c
+
+Abstract:
+
+Revision history:
+  2000-Feb-07 M(f)J   Genesis.
+
+**/
+
+#include "Snp.h"
+
+
+/**
+  this routine calls undi to start the interface and changes the snp state!
+
+  @param  snp                    pointer to snp driver structure
+
+
+**/
+EFI_STATUS
+pxe_start (
+  SNP_DRIVER *snp
+  )
+{
+  PXE_CPB_START_31  *cpb_31;
+
+  cpb_31  = snp->cpb;
+  //
+  // Initialize UNDI Start CDB for H/W UNDI
+  //
+  snp->cdb.OpCode     = PXE_OPCODE_START;
+  snp->cdb.OpFlags    = PXE_OPFLAGS_NOT_USED;
+  snp->cdb.CPBsize    = PXE_CPBSIZE_NOT_USED;
+  snp->cdb.DBsize     = PXE_DBSIZE_NOT_USED;
+  snp->cdb.CPBaddr    = PXE_CPBADDR_NOT_USED;
+  snp->cdb.DBaddr     = PXE_DBADDR_NOT_USED;
+  snp->cdb.StatCode   = PXE_STATCODE_INITIALIZE;
+  snp->cdb.StatFlags  = PXE_STATFLAGS_INITIALIZE;
+  snp->cdb.IFnum      = snp->if_num;
+  snp->cdb.Control    = PXE_CONTROL_LAST_CDB_IN_LIST;
+
+  //
+  // Make changes to H/W UNDI Start CDB if this is
+  // a S/W UNDI.
+  //
+  if (snp->is_swundi) {
+    snp->cdb.CPBsize  = sizeof (PXE_CPB_START_31);
+    snp->cdb.CPBaddr  = (UINT64)(UINTN) cpb_31;
+
+    cpb_31->Delay     = (UINT64)(UINTN) &snp_undi32_callback_delay;
+    cpb_31->Block     = (UINT64)(UINTN) &snp_undi32_callback_block;
+
+    //
+    // Virtual == Physical.  This can be set to zero.
+    //
+    cpb_31->Virt2Phys = (UINT64)(UINTN) 0;
+    cpb_31->Mem_IO    = (UINT64)(UINTN) &snp_undi32_callback_memio;
+
+    cpb_31->Map_Mem   = (UINT64)(UINTN) &snp_undi32_callback_map;
+    cpb_31->UnMap_Mem = (UINT64)(UINTN) &snp_undi32_callback_unmap;
+    cpb_31->Sync_Mem  = (UINT64)(UINTN) &snp_undi32_callback_sync;
+
+    cpb_31->Unique_ID = (UINT64)(UINTN) snp;
+  }
+  //
+  // Issue UNDI command and check result.
+  //
+  DEBUG ((EFI_D_NET, "\nsnp->undi.start()  "));
+
+  (*snp->issue_undi32_command) ((UINT64)(UINTN) &snp->cdb);
+
+  if (snp->cdb.StatCode != PXE_STATCODE_SUCCESS) {
+    //
+    // UNDI could not be started. Return UNDI error.
+    //
+    DEBUG (
+      (EFI_D_ERROR,
+      "\nsnp->undi.start()  %xh:%xh\n",
+      snp->cdb.StatCode,
+      snp->cdb.StatFlags)
+      );
+
+    return EFI_DEVICE_ERROR;
+  }
+  //
+  // Set simple network state to Started and return success.
+  //
+  snp->mode.State = EfiSimpleNetworkStarted;
+
+  return EFI_SUCCESS;
+}
+
+
+/**
+  This is the SNP interface routine for starting the interface
+  This routine basically retrieves snp structure, checks the SNP state and
+  calls the pxe_start routine to actually do start undi interface
+
+  @param  This                   context pointer
+
+  @retval EFI_INVALID_PARAMETER  "This" is Null
+  @retval      No                SNP driver can be extracted from "This"
+  @retval EFI_ALREADY_STARTED    The state of SNP is EfiSimpleNetworkStarted or
+                                 EfiSimpleNetworkInitialized
+  @retval EFI_DEVICE_ERROR       The state of SNP is other than
+                                 EfiSimpleNetworkStarted,
+                                 EfiSimpleNetworkInitialized, and
+                                 EfiSimpleNetworkStopped
+  @retval EFI_SUCCESS            UNDI interface is succesfully started
+  @retval Other                  Error occurs while calling pxe_start function.
+
+**/
+EFI_STATUS
+EFIAPI
+snp_undi32_start (
+  IN EFI_SIMPLE_NETWORK_PROTOCOL *This
+  )
+{
+  SNP_DRIVER  *Snp;
+  EFI_STATUS  Status;
+  UINTN       Index;
+  EFI_TPL     OldTpl;
+
+  if (This == NULL) {
+    return EFI_INVALID_PARAMETER;
+  }
+
+  Snp = EFI_SIMPLE_NETWORK_DEV_FROM_THIS (This);
+
+  OldTpl = gBS->RaiseTPL (TPL_CALLBACK);
+
+  switch (Snp->mode.State) {
+  case EfiSimpleNetworkStopped:
+    break;
+
+  case EfiSimpleNetworkStarted:
+  case EfiSimpleNetworkInitialized:
+    Status = EFI_ALREADY_STARTED;
+    goto ON_EXIT;
+
+  default:
+    Status = EFI_DEVICE_ERROR;
+    goto ON_EXIT;
+  }
+
+  Status = pxe_start (Snp);
+  if (EFI_ERROR (Status)) {
+    goto ON_EXIT;
+  }
+  //
+  // clear the map_list in SNP structure
+  //
+  for (Index = 0; Index < MAX_MAP_LENGTH; Index++) {
+    Snp->map_list[Index].virt       = 0;
+    Snp->map_list[Index].map_cookie = 0;
+  }
+
+  Snp->mode.MCastFilterCount = 0;
+
+ON_EXIT:
+  gBS->RestoreTPL (OldTpl);
+
+  return Status;
+}