Index: src/router/quagga/ospf6d/ospf6_abr.c
===================================================================
--- src/router/quagga/ospf6d/ospf6_abr.c	(revision 12634)
+++ src/router/quagga/ospf6d/ospf6_abr.c	(revision 18797)
@@ -556,5 +556,6 @@
       prefix.prefixlen = prefix_lsa->prefix.prefix_length;
       ospf6_prefix_in6_addr (&prefix.u.prefix6, &prefix_lsa->prefix);
-      prefix2str (&prefix, buf, sizeof (buf));
+      if (is_debug)
+        prefix2str (&prefix, buf, sizeof (buf));
       table = oa->ospf6->route_table;
       type = OSPF6_DEST_TYPE_NETWORK;
@@ -575,5 +576,6 @@
         OSPF6_LSA_HEADER_END (lsa->header);
       ospf6_linkstate_prefix (router_lsa->router_id, htonl (0), &prefix);
-      inet_ntop (AF_INET, &router_lsa->router_id, buf, sizeof (buf));
+      if (is_debug)
+        inet_ntop (AF_INET, &router_lsa->router_id, buf, sizeof (buf));
       table = oa->ospf6->brouter_table;
       type = OSPF6_DEST_TYPE_ROUTER;