+ /**
+ * a popular path-ist is one that is shared amongst many entries.
+ * Path list become popular as they gain more children, but they
+ * don't become unpopular as they lose them.
+ */
+ FIB_PATH_LIST_ATTRIBUTE_POPULAR,
+ /**
+ * no uRPF - do not generate unicast RPF list for this path-list
+ */
+ FIB_PATH_LIST_ATTRIBUTE_NO_URPF,