diff --git a/ospfd/ospf_ism.c b/ospfd/ospf_ism.c
index 1840283..3172587 100644
--- a/ospfd/ospf_ism.c
+++ b/ospfd/ospf_ism.c
@@ -221,8 +221,8 @@
 
   new_state = ospf_ism_state (oi);
 
-  zlog_info ("DR-Election[1st]: Backup %s", inet_ntoa (BDR (oi)));
-  zlog_info ("DR-Election[1st]: DR     %s", inet_ntoa (DR (oi)));
+  zlog_debug ("DR-Election[1st]: Backup %s", inet_ntoa (BDR (oi)));
+  zlog_debug ("DR-Election[1st]: DR     %s", inet_ntoa (DR (oi)));
 
   if (new_state != old_state &&
       !(new_state == ISM_DROther && old_state < ISM_DROther))
@@ -232,8 +232,8 @@
 
       new_state = ospf_ism_state (oi);
 
-      zlog_info ("DR-Election[2nd]: Backup %s", inet_ntoa (BDR (oi)));
-      zlog_info ("DR-Election[2nd]: DR     %s", inet_ntoa (DR (oi)));
+      zlog_debug ("DR-Election[2nd]: Backup %s", inet_ntoa (BDR (oi)));
+      zlog_debug ("DR-Election[2nd]: DR     %s", inet_ntoa (DR (oi)));
     }
 
   list_delete (el_list);
diff --git a/ospfd/ospf_network.c b/ospfd/ospf_network.c
index 89ff203..1e2d44e 100644
--- a/ospfd/ospf_network.c
+++ b/ospfd/ospf_network.c
@@ -61,7 +61,7 @@
 	       "on # of multicast group memberships has been exceeded?",
                top->fd, inet_ntoa(p->u.prefix4), ifindex, safe_strerror(errno));
   else
-    zlog_info ("interface %s [%u] join AllSPFRouters Multicast group.",
+    zlog_debug ("interface %s [%u] join AllSPFRouters Multicast group.",
 	       inet_ntoa (p->u.prefix4), ifindex);
 
   return ret;
@@ -81,8 +81,8 @@
 	       "ifindex %u, AllSPFRouters): %s",
                top->fd, inet_ntoa(p->u.prefix4), ifindex, safe_strerror(errno));
   else
-    zlog_info ("interface %s [%u] leave AllSPFRouters Multicast group.",
-	       inet_ntoa (p->u.prefix4), ifindex);
+    zlog_debug ("interface %s [%u] leave AllSPFRouters Multicast group.",
+	        inet_ntoa (p->u.prefix4), ifindex);
 
   return ret;
 }
@@ -103,8 +103,8 @@
 	       "on # of multicast group memberships has been exceeded?",
                top->fd, inet_ntoa(p->u.prefix4), ifindex, safe_strerror(errno));
   else
-    zlog_info ("interface %s [%u] join AllDRouters Multicast group.",
-	       inet_ntoa (p->u.prefix4), ifindex);
+    zlog_debug ("interface %s [%u] join AllDRouters Multicast group.",
+	        inet_ntoa (p->u.prefix4), ifindex);
 
   return ret;
 }
@@ -123,8 +123,8 @@
 	       "ifindex %u, AllDRouters): %s",
                top->fd, inet_ntoa(p->u.prefix4), ifindex, safe_strerror(errno));
   else
-    zlog_info ("interface %s [%u] leave AllDRouters Multicast group.",
-	       inet_ntoa (p->u.prefix4), ifindex);
+    zlog_debug ("interface %s [%u] leave AllDRouters Multicast group.",
+	        inet_ntoa (p->u.prefix4), ifindex);
 
   return ret;
 }