ospf6d will crash if the same range is defined twice.
There was no check if the same range had previously been defined,
thereby causing a later assert to fail.
@@ -353,6 +353,12 @@ DEFUN (area_range,
UNSET_FLAG (range->flag, OSPF6_ROUTE_DO_NOT_ADVERTISE);
+ if (range->rnode)
+ vty_out (vty, "Range already defined: %s%s", argv[-1], VNL);
+ return CMD_WARNING;
ospf6_route_add (range, oa->range_table);