diff --git a/xCAT-server/lib/xcat/plugins/blade.pm b/xCAT-server/lib/xcat/plugins/blade.pm
index 1c0fa396c..0a3cb6dda 100644
--- a/xCAT-server/lib/xcat/plugins/blade.pm
+++ b/xCAT-server/lib/xcat/plugins/blade.pm
@@ -4296,7 +4296,13 @@ sub process_request {
     $invreq{command} = ['rinv'];
     my $mac;
     my $ip = $request->{'_xcat_clientip'};
-    my $arptable = `/sbin/arp -n`;
+    my $arptable;
+    if ( -x "/usr/sbin/arp" ) {
+        $arptable = `/usr/sbin/arp -n`;
+    }
+    else{
+        $arptable = `/sbin/arp -n`;
+    }
     my @arpents = split /\n/,$arptable;
     foreach  (@arpents) {
       if (m/^($ip)\s+\S+\s+(\S+)\s/) {
diff --git a/xCAT-server/lib/xcat/plugins/hpblade.pm b/xCAT-server/lib/xcat/plugins/hpblade.pm
index 2f7b2c7e5..1322d2708 100755
--- a/xCAT-server/lib/xcat/plugins/hpblade.pm
+++ b/xCAT-server/lib/xcat/plugins/hpblade.pm
@@ -689,7 +689,13 @@ sub process_request {
 		$invreq{command} = ['rinv'];
 		my $mac;
 		my $ip = $request->{'_xcat_clientip'};
-		my $arptable = `/sbin/arp -n`;
+		my $arptable;
+                if ( -x "/usr/sbin/arp") {
+                    $arptable = `/usr/sbin/arp -n`;
+                }
+                else{
+                    $arptable = `/sbin/arp -n`;
+                }
 		my @arpents = split /\n/,$arptable;
 		foreach  (@arpents) {
 			if (m/^($ip)\s+\S+\s+(\S+)\s/) {
diff --git a/xCAT-server/lib/xcat/plugins/profilednodes.pm b/xCAT-server/lib/xcat/plugins/profilednodes.pm
index da8fc7313..fa5ee2d47 100644
--- a/xCAT-server/lib/xcat/plugins/profilednodes.pm
+++ b/xCAT-server/lib/xcat/plugins/profilednodes.pm
@@ -37,6 +37,7 @@ my %allnicips;
 my %allracks;
 my %allchassis;
 my %allswitches;
+
 # The array of all chassis which is special CMM 
 my %allcmmchassis;
 my %allothernics;
@@ -1436,7 +1437,13 @@ sub findme{
     my $ip = $request->{'_xcat_clientip'};
     xCAT::MsgUtils->message('S', "Profield nodes discover: _xcat_clientip is $ip.\n");
     my $mac = '';
-    my $arptable = `/sbin/arp -n`;
+    my $arptable;
+    if ( -x "/usr/sbin/arp" ){
+        $arptable = `/usr/sbin/arp -n`;
+    }
+    else {
+        $arptable = `/sbin/arp -n`;
+    }
     my @arpents = split /\n/,$arptable;
     foreach  (@arpents) {
         if (m/^($ip)\s+\S+\s+(\S+)\s/) {
diff --git a/xCAT-server/lib/xcat/plugins/seqdiscovery.pm b/xCAT-server/lib/xcat/plugins/seqdiscovery.pm
index 08052a707..7cc1a407b 100644
--- a/xCAT-server/lib/xcat/plugins/seqdiscovery.pm
+++ b/xCAT-server/lib/xcat/plugins/seqdiscovery.pm
@@ -71,7 +71,13 @@ sub findme {
     if (defined $request->{nodetype} and $request->{nodetype}->[0] eq 'virtual') {
         return;
     }
-    my $arptable = `/sbin/arp -n`;
+    my $arptable;
+    if ( -x "/usr/sbin/arp") {
+        $arptable = `/usr/sbin/arp -n`;
+    }
+    else{ 
+        $arptable = `/sbin/arp -n`;
+    }
     my @arpents = split /\n/,$arptable;
     foreach  (@arpents) {
         if (m/^($ip)\s+\S+\s+(\S+)\s/) {
diff --git a/xCAT-server/lib/xcat/plugins/switch.pm b/xCAT-server/lib/xcat/plugins/switch.pm
index 3ae9ef45d..29b00a4bc 100644
--- a/xCAT-server/lib/xcat/plugins/switch.pm
+++ b/xCAT-server/lib/xcat/plugins/switch.pm
@@ -130,7 +130,13 @@ sub process_request {
 	    #discovery working.  Food for thought.
 	    return;
 	}
-	my $arptable = `/sbin/arp -n`;
+	my $arptable;
+        if ( -x "/usr/sbin/arp") {
+            $arptable = `/usr/sbin/arp -n`;
+        }
+        else{
+            $arptable = `/sbin/arp -n`;
+        }
 	my @arpents = split /\n/,$arptable;
 	foreach  (@arpents) {
 	    if (m/^($ip)\s+\S+\s+(\S+)\s/) {