+ [optional for OF1.3+]
+
+ * Per-flow meters. OpenFlow protocol support is now implemented.
+ Support for the special OFPM_SLOWPATH and OFPM_CONTROLLER meters
+ is missing. Support for the software switch is under review.
+ [optional for OF1.3+]
+
+ * Auxiliary connections. An implementation in generic code might
+ be a week's worth of work. The value of an implementation in
+ generic code is questionable, though, since much of the benefit
+ of axuiliary connections is supposed to be to take advantage of
+ hardware support. (We could make the kernel module somehow
+ send packets across the auxiliary connections directly, for
+ some kind of "hardware" support, if we judged it useful enough.)
+ [optional for OF1.3+]
+
+ * Provider Backbone Bridge tagging. I don't plan to implement
+ this (but we'd accept an implementation).
+ [optional for OF1.3+]
+
+ * On-demand flow counters. I think this might be a real
+ optimization in some cases for the software switch.
+ [optional for OF1.3+]
+
+ONF OpenFlow Exensions for 1.3.X Pack1
+--------------------------------------
+
+OpenFlow 1.3 has a bunch of ONF extentions.
+Many of them are necessary for OpenFlow 1.4 as well.
+
+ * Flow entry notifications
+ This seems to be modelled after OVS's NXST_FLOW_MONITOR.
+ [EXT-187]
+ [required for OF1.4+]
+
+ * Role Status
+ [EXT-191]
+ [required for OF1.4+]
+
+ * Flow entry eviction
+ OVS has flow eviction functionality.
+ table_mod OFPTC_EVICTION, flow_mod 'importance', and
+ table_desc ofp_table_mod_prop_eviction need to be implemented.
+ [EXT-192-e]
+ [optional for OF1.4+]
+
+ * Vacancy events
+ [EXT-192-v]
+ [optional for OF1.4+]
+
+ * Bundle
+ Transactional modification. OpenFlow 1.4 requires to support
+ flow_mods and port_mods in a bundle.
+ (Not related to OVS's 'ofbundle' stuff.)
+ [EXT-230]
+ [required for OF1.4+]
+
+ * Table synchronisation
+ [EXT-232]
+ [optional for OF1.4+]
+
+ * Group notifications
+ [EXT-235]
+ [optional for OF1.4+]
+
+ * Bad flow entry priority error
+ Probably not so useful to the software switch.
+ [EXT-236]
+ [optional for OF1.4+]
+
+ * Set async config error
+ [EXT-237]
+ [optional for OF1.4+]
+
+ * PBB UCA header field
+ [EXT-256]
+ [optional for OF1.4+]
+
+ * Duplicate instruction error
+ We already have ONFBIC_DUP_INSTRUCTION.
+ [EXT-260]
+ [required for OF1.4+]
+
+ * Multipart timeout error
+ [EXT-264]
+ [required for OF1.4+]
+
+OpenFlow 1.4
+------------