+ - Dropped support for Python older than version 2.7. As a consequence,
+ using Open vSwitch 2.5 or later on XenServer 6.5 or earlier (which
+ have Python 2.4) requires first installing Python 2.7.
+ - OpenFlow:
+ * Group chaining (where one OpenFlow group triggers another) is
+ now supported.
+ * OpenFlow 1.4+ "importance" is now considered for flow eviction.
+ * OpenFlow 1.4+ OFPTC_EVICTION is now implemented.
+ * OpenFlow 1.4+ OFPMP_TABLE_DESC is now implemented.
+ - Support for matching/generating options as well as the OAM bit with
+ Geneve tunnels.
+ - Support Multicast Listener Discovery (MLDv1 and MLDv2).
+ - Add 'symmetric_l3l4' and 'symmetric_l3l4+udp' hash functions.
+ - sFlow agent now reports tunnel and MPLS structures.
+ - Added OpenFlow 1.4+ OFPT_SET_ASYNC_CONFIG and OFPT_GET_ASYNC_CONFIG
+ that allows controllers to have more precise control over OpenFlow1.4
+ asynchronous messages.
+ - New 'check-system-userspace', 'check-kmod' and 'check-kernel' Makefile
+ targets to run a new system testsuite. These tests can be run inside
+ a Vagrant box. See INSTALL.md for details
+ - Dropped support for GRE64 tunnel.
+
+
+v2.4.0 - 20 Aug 2015
+---------------------
+ - Flow table modifications are now atomic, meaning that each packet
+ now sees a coherent version of the OpenFlow pipeline. For
+ example, if a controller removes all flows with a single OpenFlow
+ "flow_mod", no packet sees an intermediate version of the OpenFlow
+ pipeline where only some of the flows have been deleted.
+ - Added support for SFQ, FQ_CoDel and CoDel qdiscs.
+ - Add bash command-line completion support for ovs-vsctl Please check
+ utilities/ovs-command-compgen.INSTALL.md for how to use.
+ - The MAC learning feature now includes per-port fairness to mitigate
+ MAC flooding attacks.
+ - New support for a "conjunctive match" OpenFlow extension, which
+ allows constructing OpenFlow matches of the form "field1 in
+ {a,b,c...} AND field2 in {d,e,f...}" and generalizations. For details,
+ see documentation for the "conjunction" action in ovs-ofctl(8).