diff --git a/xCAT/postscripts/nicutils.sh b/xCAT/postscripts/nicutils.sh
index 3141020ff..2d9bbb10e 100755
--- a/xCAT/postscripts/nicutils.sh
+++ b/xCAT/postscripts/nicutils.sh
@@ -631,6 +631,8 @@ function add_br() {
          type brctl >/dev/null 2>/dev/null || echo "There is no brctl" >&2 && exit 1
          log_info "brctl addbr $BNAME" 
          brctl addbr $BNAME
+         log_info "brctl stp $BNAME on"
+         brctl stp $BNAME on
      fi
 }
 
@@ -657,6 +659,8 @@ function add_if() {
         log_info "brctl addif $BNAME $PORT" 
         brctl addif $BNAME $PORT
     fi
+    
+
 }
 
 ###############################################################################
@@ -845,7 +849,7 @@ function create_bridge_interface {
     # generate bridge interface definition
     cfg=""
     cfg="${cfg}${cfg:+,}ONBOOT=yes"
-
+    cfg="${cfg}${cfg:+,}STP=on"
     if grep -q -i "release 6" /etc/redhat-release ; then
         cfg="${cfg}${cfg:+,}NM_CONTROLLED=no"
     fi