diff --git a/xCAT-server-2.0/lib/xcat/plugins/pxe.pm b/xCAT-server-2.0/lib/xcat/plugins/pxe.pm
index 3d59a7a8c..702e741c6 100644
--- a/xCAT-server-2.0/lib/xcat/plugins/pxe.pm
+++ b/xCAT-server-2.0/lib/xcat/plugins/pxe.pm
@@ -124,6 +124,39 @@ sub pass_along {
 
 
 
+sub preprocess_request {
+   my $req = shift;
+   my $callback = shift;
+  my %localnodehash;
+  my %dispatchhash;
+  my $nrtab = xCAT::Table->new('noderes');
+  foreach my $node (@{$req->{node}}) {
+     my $nodeserver;
+     my $tent = $nrtab->getNodeAttribs($node,['tftpserver']);
+     if ($tent) { $nodeserver = $tent->{tftpserver} }
+     unless ($tent and $tent->{tftpserver}) {
+        $tent = $nrtab->getNodeAttribs($node,['servicenode']);
+        if ($tent) { $nodeserver = $tent->{servicenode} }
+     }
+     if ($nodeserver) {
+        $dispatchhash{$nodeserver}->{$node} = 1;
+     } else {
+        $localnodehash{$node} = 1;
+     }
+  }
+  my @requests;
+  my $reqc = {%$req};
+  $reqc->{node} = [ keys %localnodehash ];
+  if (scalar(@{$reqc->{node}})) { push @requests,$reqc }
+
+  foreach my $dtarg (keys %dispatchhash) { #iterate dispatch targets
+     my $reqcopy = {%$req}; #deep copy
+     $reqcopy->{'_xcatdest'} = $dtarg;
+     $reqcopy->{node} = [ keys %{$dispatchhash{$dtarg}}];
+     push @requests,$reqcopy;
+  }
+  return \@requests;
+}
 
 sub process_request {
   $request = shift;
diff --git a/xCAT-server-2.0/lib/xcat/plugins/yaboot.pm b/xCAT-server-2.0/lib/xcat/plugins/yaboot.pm
index 758ebcaca..7ac5eb59a 100644
--- a/xCAT-server-2.0/lib/xcat/plugins/yaboot.pm
+++ b/xCAT-server-2.0/lib/xcat/plugins/yaboot.pm
@@ -124,6 +124,40 @@ sub pass_along {
 }
 
 
+  
+sub preprocess_request {
+   my $req = shift;
+   my $callback = shift;
+  my %localnodehash;
+  my %dispatchhash;
+  my $nrtab = xCAT::Table->new('noderes');
+  foreach my $node (@{$req->{node}}) {
+     my $nodeserver;
+     my $tent = $nrtab->getNodeAttribs($node,['tftpserver']);
+     if ($tent) { $nodeserver = $tent->{tftpserver} }
+     unless ($tent and $tent->{tftpserver}) {
+        $tent = $nrtab->getNodeAttribs($node,['servicenode']);
+        if ($tent) { $nodeserver = $tent->{servicenode} }
+     }
+     if ($nodeserver) {
+        $dispatchhash{$nodeserver}->{$node} = 1;
+     } else {
+        $localnodehash{$node} = 1;
+     }
+  }
+  my @requests;
+  my $reqc = {%$req};
+  $reqc->{node} = [ keys %localnodehash ];
+  if (scalar(@{$reqc->{node}})) { push @requests,$reqc }
+
+  foreach my $dtarg (keys %dispatchhash) { #iterate dispatch targets
+     my $reqcopy = {%$req}; #deep copy
+     $reqcopy->{'_xcatdest'} = $dtarg;
+     $reqcopy->{node} = [ keys %{$dispatchhash{$dtarg}}];
+     push @requests,$reqcopy;
+  }
+  return \@requests;
+}