diff --git a/xCAT-server/lib/xcat/plugins/AAsn.pm b/xCAT-server/lib/xcat/plugins/AAsn.pm
index c521e906c..31b4ac625 100644
--- a/xCAT-server/lib/xcat/plugins/AAsn.pm
+++ b/xCAT-server/lib/xcat/plugins/AAsn.pm
@@ -53,6 +53,7 @@ sub handled_commands
 
 {
 
+
     # If called in XCATBYPASS mode, don't do any setup
     if ($ENV{'XCATBYPASS'})
     {
@@ -66,6 +67,7 @@ sub handled_commands
     }
 
     my $rc = 0;
+    my $plugins_dir=$::XCATROOT.'/lib/perl/xCAT_plugin';
 
     if (xCAT::Utils->isServiceNode())
     {
@@ -936,6 +938,7 @@ sub setup_TFTP
         } else { #if not mounting, have to regenerate....
             #first, run mknb to get nbfs and such going?
             my $cmdref;
+            use xCAT_plugin::mknb;
             $cmdref->{command}->[0] = "mknb";
             $cmdref->{arg}->[0] = "ppc64";
             ${"xCAT_plugin::mknb::"}{process_request}->($cmdref, \&xCAT::Client::handle_response);
@@ -944,7 +947,6 @@ sub setup_TFTP
             $cmdref->{arg}->[0] = "x86_64";
             ${"xCAT_plugin::mknb::"}{process_request}->($cmdref, \&xCAT::Client::handle_response);
             #now, run nodeset enact on
-            #now, run nodeset enact on
             my $mactab = xCAT::Table->new('mac');
             my $hmtab = xCAT::Table->new('nodehm');
             if ($mactab and $hmtab) {
@@ -966,6 +968,7 @@ sub setup_TFTP
                 $cmdref->{cwd}->[0]     = "/opt/xcat/sbin";
                 foreach my $modname (keys %netmethods) {
                     $cmdref->{node} = $netmethods{$modname};
+                    require "$plugins_dir/$modname.pm";
                     ${"xCAT_plugin::" . $modname . "::"}{process_request}->($cmdref, \&xCAT::Client::handle_response);
                 }
                 
diff --git a/xCAT-server/lib/xcat/plugins/pxe.pm b/xCAT-server/lib/xcat/plugins/pxe.pm
index 67639c12a..631646641 100644
--- a/xCAT-server/lib/xcat/plugins/pxe.pm
+++ b/xCAT-server/lib/xcat/plugins/pxe.pm
@@ -338,6 +338,7 @@ sub process_request {
       }
     }
   }
+  unless ($sub_req) { return; } #Don't bother to try dhcp binding changes if sub_req not passed, i.e. service node build time
   if ($args[0] ne 'stat') {
   if ($req->{'_disparatetftp'}->[0]) { #reading hint from preprocess_command
     $sub_req->({command=>['makedhcp'],arg=>['-l'],
diff --git a/xCAT-server/lib/xcat/plugins/yaboot.pm b/xCAT-server/lib/xcat/plugins/yaboot.pm
index 948075de4..0fcd343e0 100644
--- a/xCAT-server/lib/xcat/plugins/yaboot.pm
+++ b/xCAT-server/lib/xcat/plugins/yaboot.pm
@@ -319,6 +319,7 @@ sub process_request {
       }
     }
   }
+  unless ($sub_req) { return; } #Don't bother to try dhcp binding changes if sub_req not passed, i.e. service node build time
   my @normalnodeset = keys %normalnodes;
   if ($req->{'_disparatetftp'}->[0]) { #reading hint from preprocess_command, only change local settings if already farmed
   $sub_req->({command=>['makedhcp'],arg=>['-l'],