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1 Post-v2.6.0
2 ---------------------
3 - Utilities and daemons that support SSL now allow protocols and
4 ciphers to be configured with --ssl-protocols and --ssl-ciphers.
5 - OVN:
6 * QoS is now implemented via egress shaping rather than ingress policing.
7 * DSCP marking is now supported, via the new northbound QoS table.
8 * IPAM now supports fixed MAC addresses.
9 * Support for source IP address based routing.
10 * ovn-trace:
11 - New --ovs option to also print OpenFlow flows.
12 - put_dhcp_opts and put_dhcp_optsv6 actions may now be traced.
13 * Support for managing SSL and remote connection configuration in
14 northbound and southbound databases.
15 * TCP connections to northbound and southbound databases are no
16 longer enabled by default and must be explicitly configured.
17 See documentation for ovn-sbctl/ovn-nbctl "set-connection"
18 command or the ovn-ctl "--db-sb-create-insecure-remote" and
19 "--db-nb-create-insecure-remote" command-line options for
20 information regarding remote connection configuration.
21 * New appctl "inject-pkt" command in ovn-controller that allows
22 packets to be injected into the connected OVS instance.
23 - Fixed regression in table stats maintenance introduced in OVS
24 2.3.0, wherein the number of OpenFlow table hits and misses was
25 not accurate.
26 - OpenFlow:
27 * OFPT_PACKET_OUT messages are now supported in bundles.
28 * A new "selection_method=dp_hash" type for OpenFlow select group
29 bucket selection that uses the datapath computed 5-tuple hash
30 without making datapath flows match the 5-tuple fields, which
31 is useful for more efficient load balancing, for example. This
32 uses the Netronome extension to OpenFlow 1.5+ that allows
33 control over the OpenFlow select groups selection method. See
34 "selection_method" and related options in ovs-ofctl(8) for
35 details.
36 * The "sample" action now supports "ingress" and "egress" options.
37 * The "ct" action now supports the TFTP ALG where support is available.
38 - ovs-ofctl:
39 * 'bundle' command now supports packet-out messages.
40 * New syntax for 'ovs-ofctl packet-out' command, which uses the
41 same string parser as the 'bundle' command. The old 'packet-out'
42 syntax is deprecated and will be removed in a later OVS
43 release.
44 * New unixctl "ofctl/packet-out" command, which can be used to
45 instruct a flow monitor to issue OpenFlow packet-out messages.
46 - ovsdb-server:
47 * Remote connections can now be made read-only (see ovsdb-server(1)).
48 - Tunnels:
49 * TLV mappings for protocols such as Geneve are now segregated on
50 a per-OpenFlow bridge basis rather than globally. (The interface
51 has not changed.)
52 * Removed support for IPsec tunnels.
53 - DPDK:
54 * New option 'n_rxq_desc' and 'n_txq_desc' fields for DPDK interfaces
55 which set the number of rx and tx descriptors to use for the given port.
56 * Support for DPDK v16.11.
57 * Support for rx checksum offload. Refer DPDK HOWTO for details.
58 * Port Hotplug is now supported.
59 - Fedora packaging:
60 * A package upgrade does not automatically restart OVS service.
61 - ovs-vswitchd/ovs-vsctl:
62 * Ports now have a "protected" flag. Protected ports can not forward
63 frames to other protected ports. Unprotected ports can receive and
64 forward frames to protected and other unprotected ports.
65 - ovs-vsctl, ovn-nbctl, ovn-sbctl, vtep-ctl:
66 * Database commands now accept integer ranges, e.g. "set port
67 eth0 trunks=1-10" to enable trunking VLANs 1 to 10.
68
69 v2.6.0 - 27 Sep 2016
70 ---------------------
71 - First supported release of OVN. See ovn-architecture(7) for more
72 details.
73 - ovsdb-server:
74 * New "monitor_cond" "monitor_cond_update" and "update2" extensions to
75 RFC 7047.
76 - OpenFlow:
77 * OpenFlow 1.3+ bundles now expire after 10 seconds since the
78 last time the bundle was either opened, modified, or closed.
79 * OpenFlow 1.3 Extension 230, adding OpenFlow Bundles support, is
80 now implemented.
81 * OpenFlow 1.3+ bundles are now supported for group mods as well as
82 flow mods and port mods. Both 'atomic' and 'ordered' bundle
83 flags are supported for group mods as well as flow mods.
84 * Internal OpenFlow rule representation for load and set-field
85 actions is now much more memory efficient. For a complex flow
86 table this can reduce rule memory consumption by 40%.
87 * Bundles are now much more memory efficient than in OVS 2.5.
88 Together with memory efficiency improvements in OpenFlow rule
89 representation, the peak OVS resident memory use during a
90 bundle commit for large complex set of flow mods can be only
91 25% of that in OVS 2.5 (4x lower).
92 * OpenFlow 1.1+ OFPT_QUEUE_GET_CONFIG_REQUEST now supports OFPP_ANY.
93 * OpenFlow 1.4+ OFPMP_QUEUE_DESC is now supported.
94 * OpenFlow 1.4+ OFPT_TABLE_STATUS is now supported.
95 * New property-based packet-in message format NXT_PACKET_IN2 with support
96 for arbitrary user-provided data and for serializing flow table
97 traversal into a continuation for later resumption.
98 * New extension message NXT_SET_ASYNC_CONFIG2 to allow OpenFlow 1.4-like
99 control over asynchronous messages in earlier versions of OpenFlow.
100 * New OpenFlow extension NXM_NX_MPLS_TTL to provide access to MPLS TTL.
101 * New output option, output(port=N,max_len=M), to allow truncating a
102 packet to size M bytes when outputting to port N.
103 * New command OFPGC_ADD_OR_MOD for OFPT_GROUP_MOD message that adds a
104 new group or modifies an existing groups
105 * The optional OpenFlow packet buffering feature is deprecated in
106 this release, and will be removed in the next OVS release
107 (2.7). After the change OVS always sends the 'buffer_id' as
108 0xffffffff in packet-in messages and will send an error
109 response if any other value of this field is included in
110 packet-out and flow mod sent by a controller. Controllers are
111 already expected to work properly in cases where the switch can
112 not buffer packets, so this change should not affect existing
113 users.
114 * New OpenFlow extension NXT_CT_FLUSH_ZONE to flush conntrack zones.
115 - Improved OpenFlow version compatibility for actions:
116 * New OpenFlow extension to support the "group" action in OpenFlow 1.0.
117 * OpenFlow 1.0 "enqueue" action now properly translated to OpenFlow 1.1+.
118 * OpenFlow 1.1 "mod_nw_ecn" and OpenFlow 1.1+ "mod_nw_ttl" actions now
119 properly translated to OpenFlow 1.0.
120 - ovs-ofctl:
121 * queue-get-config command now allows a queue ID to be specified.
122 * '--bundle' option can now be used with OpenFlow 1.3 and with group mods.
123 * New "bundle" command allows executing a mixture of flow and group mods
124 as a single atomic transaction.
125 * New option "--color" to produce colorized output for some commands.
126 * New option '--may-create' to use OFPGC_ADD_OR_MOD in mod-group command.
127 - IPFIX:
128 * New "sampling_port" option for "sample" action to allow sampling
129 ingress and egress tunnel metadata with IPFIX.
130 * New ovs-ofctl commands "dump-ipfix-bridge" and "dump-ipfix-flow" to
131 dump bridge IPFIX statistics and flow based IPFIX statistics.
132 * New setting other-config:virtual_obs_id to add an arbitrary string
133 to IPFIX records.
134 - Linux:
135 * OVS Linux datapath now implements Conntrack NAT action with all
136 supported Linux kernels.
137 * Support for truncate action.
138 * New QoS type "linux-noop" that prevents Open vSwitch from trying to
139 manage QoS for a given port (useful when other software manages QoS).
140 - DPDK:
141 * New option "n_rxq" for PMD interfaces.
142 Old 'other_config:n-dpdk-rxqs' is no longer supported.
143 Not supported by vHost interfaces. For them number of rx and tx queues
144 is applied from connected virtio device.
145 * New 'other_config:pmd-rxq-affinity' field for PMD interfaces, that
146 allows to pin port's rx queues to desired cores.
147 * New appctl command 'dpif-netdev/pmd-rxq-show' to check the port/rxq
148 assignment.
149 * Type of log messages from PMD threads changed from INFO to DBG.
150 * QoS functionality with sample egress-policer implementation.
151 * The mechanism for configuring DPDK has changed to use database
152 * Sensible defaults have been introduced for many of the required
153 configuration options
154 * DB entries have been added for many of the DPDK EAL command line
155 arguments. Additional arguments can be passed via the dpdk-extra
156 entry.
157 * Add ingress policing functionality.
158 * PMD threads servicing vHost User ports can now come from the NUMA
159 node that device memory is located on if CONFIG_RTE_LIBRTE_VHOST_NUMA
160 is enabled in DPDK.
161 * Basic connection tracking for the userspace datapath (no ALG,
162 fragmentation or NAT support yet)
163 * Support for DPDK 16.07
164 * Optional support for DPDK pdump enabled.
165 * Jumbo frame support
166 * Remove dpdkvhostcuse port type.
167 * OVS client mode for vHost and vHost reconnect (Requires QEMU 2.7)
168 * 'dpdkvhostuserclient' port type.
169 - Increase number of registers to 16.
170 - ovs-benchmark: This utility has been removed due to lack of use and
171 bitrot.
172 - ovs-appctl:
173 * New "vlog/close" command.
174 - ovs-ctl:
175 * Added the ability to selectively start the forwarding and database
176 functions (ovs-vswitchd and ovsdb-server, respectively).
177 - ovsdb-server:
178 * Remove max number of sessions limit, to enable connection scaling
179 testing.
180 - python:
181 * Added support for Python 3.4+ in addition to existing support
182 for 2.7+.
183 - SELinux:
184 * Introduced SELinux policy package.
185 - Datapath Linux kernel compatibility.
186 * Dropped support for kernel older than 3.10.
187 * Removed VLAN splinters feature.
188 * Datapath supports kernel upto 4.7.
189 - Tunnels:
190 * Flow based tunnel match and action can be used for IPv6 address using
191 tun_ipv6_src, tun_ipv6_dst fields.
192 * Added support for IPv6 tunnels, for details checkout FAQ.
193 * Deprecated support for IPsec tunnels ports.
194 - A wrapper script, 'ovs-tcpdump', to easily port-mirror an OVS port and
195 watch with tcpdump
196 - Introduce --no-self-confinement flag that allows daemons to work with
197 sockets outside their run directory.
198 - ovs-pki: Changed message digest algorithm from SHA-1 to SHA-512 because
199 SHA-1 is no longer secure and some operating systems have started to
200 disable it in OpenSSL.
201 - Add 'mtu_request' column to the Interface table. It can be used to
202 configure the MTU of the ports.
203
204 Known issues:
205 - Using openvswitch module in conjunction with upstream Linux tunnels:
206 * When using the openvswitch module distributed with OVS against kernel
207 versions 4.4 to 4.6, the openvswitch module cannot be loaded or used at
208 the same time as "ip_gre".
209 - Conntrack FTP ALGs: When using the openvswitch module distributed with
210 OVS, particular Linux distribution kernels versions may provide diminished
211 functionality. This typically affects active FTP data connections when
212 using "actions=ct(alg=ftp),..." in flow tables. Specifically:
213 * Centos 7.1 kernels (3.10.0-2xx) kernels are unable to correctly set
214 up expectations for FTP data connections in multiple zones,
215 eg "actions=ct(zone=1,alg=ftp),ct(zone=2,alg=ftp),...". Executing the
216 "ct" action for subsequent data connections may fail to determine that
217 the data connection is "related" to an existing connection.
218 * Centos 7.2 kernels (3.10.0-3xx) kernels may not establish FTP ALG state
219 correctly for NATed connections. As a result, flows that perform NAT,
220 eg "actions=ct(nat,ftp=alg,table=1),..." may fail to NAT the packet,
221 and will populate the "ct_state=inv" bit in the flow.
222
223
224 v2.5.0 - 26 Feb 2016
225 ---------------------
226 - Dropped support for Python older than version 2.7. As a consequence,
227 using Open vSwitch 2.5 or later on XenServer 6.5 or earlier (which
228 have Python 2.4) requires first installing Python 2.7.
229 - OpenFlow:
230 * Group chaining (where one OpenFlow group triggers another) is
231 now supported.
232 * OpenFlow 1.4+ "importance" is now considered for flow eviction.
233 * OpenFlow 1.4+ OFPTC_EVICTION is now implemented.
234 * OpenFlow 1.4+ OFPTC_VACANCY_EVENTS is now implemented.
235 * OpenFlow 1.4+ OFPMP_TABLE_DESC is now implemented.
236 * Allow modifying the ICMPv4/ICMPv6 type and code fields.
237 * OpenFlow 1.4+ OFPT_SET_ASYNC_CONFIG and OFPT_GET_ASYNC_CONFIG are
238 now implemented.
239 - ovs-ofctl:
240 * New "out_group" keyword for OpenFlow 1.1+ matching on output group.
241 - Tunnels:
242 * Geneve tunnels can now match and set options and the OAM bit.
243 * The nonstandard GRE64 tunnel extension has been dropped.
244 - Support Multicast Listener Discovery (MLDv1 and MLDv2).
245 - Add 'symmetric_l3l4' and 'symmetric_l3l4+udp' hash functions.
246 - sFlow agent now reports tunnel and MPLS structures.
247 - New 'check-system-userspace', 'check-kmod' and 'check-kernel' Makefile
248 targets to run a new system testsuite. These tests can be run inside
249 a Vagrant box. See INSTALL.md for details
250 - Mark --syslog-target argument as deprecated. It will be removed in
251 the next OVS release.
252 - Added --user option to all daemons
253 - Add support for connection tracking through the new "ct" action
254 and "ct_state"/"ct_zone"/"ct_mark"/"ct_label" match fields. Only
255 available on Linux kernels with the connection tracking module loaded.
256 - Add experimental version of OVN. OVN, the Open Virtual Network, is a
257 system to support virtual network abstraction. OVN complements the
258 existing capabilities of OVS to add native support for virtual network
259 abstractions, such as virtual L2 and L3 overlays and security groups.
260 - RHEL packaging:
261 * DPDK ports may now be created via network scripts (see README.RHEL).
262 - DPDK:
263 * Requires DPDK 2.2
264 * Added multiqueue support to vhost-user
265 * Note: QEMU 2.5+ required for multiqueue support
266
267 v2.4.0 - 20 Aug 2015
268 ---------------------
269 - Flow table modifications are now atomic, meaning that each packet
270 now sees a coherent version of the OpenFlow pipeline. For
271 example, if a controller removes all flows with a single OpenFlow
272 "flow_mod", no packet sees an intermediate version of the OpenFlow
273 pipeline where only some of the flows have been deleted.
274 - Added support for SFQ, FQ_CoDel and CoDel qdiscs.
275 - Add bash command-line completion support for ovs-vsctl Please check
276 utilities/ovs-command-compgen.INSTALL.md for how to use.
277 - The MAC learning feature now includes per-port fairness to mitigate
278 MAC flooding attacks.
279 - New support for a "conjunctive match" OpenFlow extension, which
280 allows constructing OpenFlow matches of the form "field1 in
281 {a,b,c...} AND field2 in {d,e,f...}" and generalizations. For details,
282 see documentation for the "conjunction" action in ovs-ofctl(8).
283 - Add bash command-line completion support for ovs-appctl/ovs-dpctl/
284 ovs-ofctl/ovsdb-tool commands. Please check
285 utilities/ovs-command-compgen.INSTALL.md for how to use.
286 - The "learn" action supports a new flag "delete_learned" that causes
287 the learned flows to be deleted when the flow with the "learn" action
288 is deleted.
289 - Basic support for the Geneve tunneling protocol. It is not yet
290 possible to generate or match options. This is planned for a future
291 release. The protocol is documented at
292 http://tools.ietf.org/html/draft-gross-geneve-00
293 - The OVS database now reports controller rate limiting statistics.
294 - sflow now exports information about LACP-based bonds, port names, and
295 OpenFlow port numbers, as well as datapath performance counters.
296 - ovs-dpctl functionality is now available for datapaths integrated
297 into ovs-vswitchd, via ovs-appctl. Some existing ovs-appctl
298 commands are now redundant and will be removed in a future
299 release. See ovs-vswitchd(8) for details.
300 - OpenFlow:
301 * OpenFlow 1.4 bundles are now supported for flow mods and port
302 mods. For flow mods, both 'atomic' and 'ordered' bundle flags
303 are trivially supported, as all bundled messages are executed
304 in the order they were added and all flow table modifications
305 are now atomic to the datapath. Port mods may not appear in
306 atomic bundles, as port status modifications are not atomic.
307 * IPv6 flow label and neighbor discovery fields are now modifiable.
308 * OpenFlow 1.5 extended registers are now supported.
309 * The OpenFlow 1.5 actset_output field is now supported.
310 * OpenFlow 1.5 Copy-Field action is now supported.
311 * OpenFlow 1.5 masked Set-Field action is now supported.
312 * OpenFlow 1.3+ table features requests are now supported (read-only).
313 * Nicira extension "move" actions may now be included in action sets.
314 * "resubmit" actions may now be included in action sets. The resubmit
315 is executed last, and only if the action set has no "output" or "group"
316 action.
317 * OpenFlow 1.4+ flow "importance" is now maintained in the flow table.
318 * A new Netronome extension to OpenFlow 1.5+ allows control over the
319 fields hashed for OpenFlow select groups. See "selection_method" and
320 related options in ovs-ofctl(8) for details.
321 - ovs-ofctl has a new '--bundle' option that makes the flow mod commands
322 ('add-flow', 'add-flows', 'mod-flows', 'del-flows', and 'replace-flows')
323 use an OpenFlow 1.4 bundle to operate the modifications as a single
324 atomic transaction. If any of the flow mods in a transaction fail, none
325 of them are executed. All flow mods in a bundle appear to datapath
326 lookups simultaneously.
327 - ovs-ofctl 'add-flow' and 'add-flows' commands now accept arbitrary flow
328 mods as an input by allowing the flow specification to start with an
329 explicit 'add', 'modify', 'modify_strict', 'delete', or 'delete_strict'
330 keyword. A missing keyword is treated as 'add', so this is fully
331 backwards compatible. With the new '--bundle' option all the flow mods
332 are executed as a single atomic transaction using an OpenFlow 1.4 bundle.
333 - ovs-pki: Changed message digest algorithm from MD5 to SHA-1 because
334 MD5 is no longer secure and some operating systems have started to disable
335 it in OpenSSL.
336 - ovsdb-server: New OVSDB protocol extension allows inequality tests on
337 "optional scalar" columns. See ovsdb-server(1) for details.
338 - ovs-vsctl now permits immutable columns in a new row to be modified in
339 the same transaction that creates the row.
340 - test-controller has been renamed ovs-testcontroller at request of users
341 who find it useful for testing basic OpenFlow setups. It is still not
342 a necessary or desirable part of most Open vSwitch deployments.
343 - Support for travis-ci.org based continuous integration builds has been
344 added. Build failures are reported to build@openvswitch.org. See INSTALL.md
345 file for additional details.
346 - Support for the Rapid Spanning Tree Protocol (IEEE 802.1D-2004).
347 The implementation has been tested successfully against the Ixia Automated
348 Network Validation Library (ANVL).
349 - Stats are no longer updated on fake bond interface.
350 - Keep active bond slave selection across OVS restart.
351 - A simple wrapper script, 'ovs-docker', to integrate OVS with Docker
352 containers. If and when there is a native integration of Open vSwitch
353 with Docker, the wrapper script will be retired.
354 - Added support for DPDK Tunneling. VXLAN, GRE, and Geneve are supported
355 protocols. This is generic tunneling mechanism for userspace datapath.
356 - Support for multicast snooping (IGMPv1, IGMPv2 and IGMPv3)
357 - Support for Linux kernels up to 4.0.x
358 - The documentation now use the term 'destination' to mean one of syslog,
359 console or file for vlog logging instead of the previously used term
360 'facility'.
361 - Support for VXLAN Group Policy extension
362 - Initial support for the IETF Auto-Attach SPBM draft standard. This
363 contains rudimentary support for the LLDP protocol as needed for
364 Auto-Attach.
365 - The default OpenFlow and OVSDB ports are now the IANA-assigned
366 numbers. OpenFlow is 6653 and OVSDB is 6640.
367 - Support for DPDK vHost.
368 - Support for outer UDP checksums in Geneve and VXLAN.
369 - The kernel vports with dependencies are no longer part of the overall
370 openvswitch.ko but built and loaded automatically as individual kernel
371 modules (vport-*.ko).
372 - Support for STT tunneling.
373 - ovs-sim: New developer tool for simulating multiple OVS instances.
374 See ovs-sim(1) for more information.
375 - Support to configure method (--syslog-method argument) that determines
376 how daemons will talk with syslog.
377 - Support for "ovs-appctl vlog/list-pattern" command that lets to query
378 logging message format for each destination.
379
380
381 v2.3.0 - 14 Aug 2014
382 ---------------------
383 - OpenFlow 1.1, 1.2, and 1.3 are now enabled by default in
384 ovs-vswitchd.
385 - Linux kernel datapath now has an exact match cache optimizing the
386 flow matching process.
387 - Datapath flows now have partially wildcarded tranport port field
388 matches. This reduces userspace upcalls, but increases the
389 number of different masks in the datapath. The kernel datapath
390 exact match cache removes the overhead of matching the incoming
391 packets with the larger number of masks, but when paired with an
392 older kernel module, some workloads may perform worse with the
393 new userspace.
394 - Compatibility with autoconf 2.63 (previously >=2.64)
395
396 v2.2.0 - Internal Release
397 ---------------------
398 - Internal ports are no longer brought up by default, because it
399 should be an administrator task to bring up devices as they are
400 configured properly.
401 - ovs-vsctl now reports when ovs-vswitchd fails to create a new port or
402 bridge.
403 - Port creation and configuration errors are now stored in a new error
404 column of the Interface table and included in 'ovs-vsctl show'.
405 - The "ovsdbmonitor" graphical tool has been removed, because it was
406 poorly maintained and not widely used.
407 - New "check-ryu" Makefile target for running Ryu tests for OpenFlow
408 controllers against Open vSwitch. See INSTALL.md for details.
409 - Added IPFIX support for SCTP flows and templates for ICMPv4/v6 flows.
410 - Upon the receipt of a SIGHUP signal, ovs-vswitchd no longer reopens its
411 log file (it will terminate instead). Please use 'ovs-appctl vlog/reopen'
412 instead.
413 - Support for Linux kernels up to 3.14. From Kernel 3.12 onwards OVS uses
414 tunnel API for GRE and VXLAN.
415 - Added DPDK support.
416 - Added support for custom vlog patterns in Python
417
418
419 v2.1.0 - 19 Mar 2014
420 ---------------------
421 - Address prefix tracking support for flow tables. New columns
422 "prefixes" in OVS-DB table "Flow_Table" controls which packet
423 header fields are used for address prefix tracking. Prefix
424 tracking allows the classifier to skip rules with longer than
425 necessary prefixes, resulting in better wildcarding for datapath
426 flows. Default configuration is to not use any fields for prefix
427 tracking. However, if any flow tables contain both exact matches
428 and masked matches for IP address fields, OVS performance may be
429 increased by using this feature.
430 * As of now, the fields for which prefix lookup can be enabled
431 are: 'tun_id', 'tun_src', 'tun_dst', 'nw_src', 'nw_dst' (or
432 aliases 'ip_src' and 'ip_dst'), 'ipv6_src', and 'ipv6_dst'.
433 (Using this feature for 'tun_id' would only make sense if the
434 tunnel IDs have prefix structure similar to IP addresses.)
435 * There is a maximum number of fields that can be enabled for any
436 one flow table. Currently this limit is 3.
437 * Examples:
438 $ ovs-vsctl set Bridge br0 flow_tables:0=@N1 -- \
439 --id=@N1 create Flow_Table name=table0
440 $ ovs-vsctl set Bridge br0 flow_tables:1=@N1 -- \
441 --id=@N1 create Flow_Table name=table1
442 $ ovs-vsctl set Flow_Table table0 prefixes=ip_dst,ip_src
443 $ ovs-vsctl set Flow_Table table1 prefixes=[]
444 - TCP flags matching: OVS now supports matching of TCP flags. This
445 has an adverse performance impact when using OVS userspace 1.10
446 or older (no megaflows support) together with the new OVS kernel
447 module. It is recommended that the kernel and userspace modules
448 both are upgraded at the same time.
449 - The default OpenFlow and OVSDB ports will change to
450 IANA-assigned numbers in a future release. Consider updating
451 your installations to specify port numbers instead of using the
452 defaults.
453 - OpenFlow:
454 * The OpenFlow 1.1+ "Write-Actions" instruction is now supported.
455 * OVS limits the OpenFlow port numbers it assigns to port 32767 and
456 below, leaving port numbers above that range free for assignment
457 by the controller.
458 * ovs-vswitchd now honors changes to the "ofport_request" column
459 in the Interface table by changing the port's OpenFlow port
460 number.
461 * The Open vSwitch software switch now supports OpenFlow groups.
462 - ovs-vswitchd.conf.db.5 man page will contain graphviz/dot
463 diagram only if graphviz package was installed at the build time.
464 - Support for Linux kernels up to 3.11
465 - ovs-dpctl:
466 The "show" command also displays mega flow mask stats.
467 - ovs-ofctl:
468 * New command "ofp-parse-pcap" to dump OpenFlow from PCAP files.
469 - ovs-controller has been renamed test-controller. It is no longer
470 packaged or installed by default, because too many users assumed
471 incorrectly that ovs-controller was a necessary or desirable part
472 of an Open vSwitch deployment.
473 - Added vlog option to export to a UDP syslog sink.
474 - ovsdb-client:
475 * The "monitor" command can now monitor all tables in a database,
476 instead of being limited to a single table.
477 - The flow-eviction-threshold has been replaced by the flow-limit which is a
478 hard limit on the number of flows in the datapath. It defaults to 200,000
479 flows. OVS automatically adjusts this number depending on network
480 conditions.
481 - Added IPv6 support for active and passive socket communications.
482
483
484 v2.0.0 - 15 Oct 2013
485 ---------------------
486 - The ovs-vswitchd process is no longer single-threaded. Multiple
487 threads are now used to handle flow set up and asynchronous
488 logging.
489 - OpenFlow:
490 * Experimental support for OpenFlow 1.1 (in addition to 1.2 and
491 1.3, which had experimental support in 1.10).
492 * Experimental protocol support for OpenFlow 1.1+ groups. This
493 does not yet include an implementation in the Open vSwitch
494 software switch.
495 * Experimental protocol support for OpenFlow 1.2+ meters. This
496 does not yet include an implementation in the Open vSwitch
497 software switch.
498 * New support for matching outer source and destination IP address
499 of tunneled packets, for tunnel ports configured with the newly
500 added "remote_ip=flow" and "local_ip=flow" options.
501 * Support for matching on metadata 'pkt_mark' for interacting with
502 other system components. On Linux this corresponds to the skb
503 mark.
504 * Support matching, rewriting SCTP ports
505 - The Interface table in the database has a new "ifindex" column to
506 report the interface's OS-assigned ifindex.
507 - New "check-oftest" Makefile target for running OFTest against Open
508 vSwitch. See README-OFTest for details.
509 - The flow eviction threshold has been moved to the Open_vSwitch table.
510 - Database names are now mandatory when specifying ovsdb-server options
511 through database paths (e.g. Private key option with the database name
512 should look like "--private-key=db:Open_vSwitch,SSL,private_key").
513 - Added ovs-dev.py, a utility script helpful for Open vSwitch developers.
514 - Support for Linux kernels up to 3.10
515 - ovs-ofctl:
516 * New "ofp-parse" for printing OpenFlow messages read from a file.
517 * New commands for OpenFlow 1.1+ groups.
518 - Added configurable flow caching support to IPFIX exporter.
519 - Dropped support for Linux pre-2.6.32.
520 - Log file timestamps and ovsdb commit timestamps are now reported
521 with millisecond resolution. (Previous versions only reported
522 whole seconds.)
523
524
525 v1.11.0 - 28 Aug 2013
526 ---------------------
527 - Support for megaflows, which allows wildcarding in the kernel (and
528 any dpif implementation that supports wildcards). Depending on
529 the flow table and switch configuration, flow set up rates are
530 close to the Linux bridge.
531 - The "tutorial" directory contains a new tutorial for some advanced
532 Open vSwitch features.
533 - Stable bond mode has been removed.
534 - The autopath action has been removed.
535 - New support for the data encapsulation format of the LISP tunnel
536 protocol (RFC 6830). An external control plane or manual flow
537 setup is required for EID-to-RLOC mapping.
538 - OpenFlow:
539 * The "dec_mpls_ttl" and "set_mpls_ttl" actions from OpenFlow
540 1.1 and later are now implemented.
541 * New "stack" extension for use in actions, to push and pop from
542 NXM fields.
543 * The "load" and "set_field" actions can now modify the "in_port". (This
544 allows one to enable output to a flow's input port by setting the
545 in_port to some unused value, such as OFPP_NONE.)
546 - ovs-dpctl:
547 * New debugging commands "add-flow", "mod-flow", "del-flow".
548 * "dump-flows" now has a -m option to increase output verbosity.
549 - In dpif-based bridges, cache action translations, which can improve
550 flow set up performance by 80% with a complicated flow table.
551 - New syslog format, prefixed with "ovs|", to be easier to filter.
552 - RHEL: Removes the default firewall rule that allowed GRE traffic to
553 pass through. Any users that relied on this automatic firewall hole
554 will have to manually configure it. The ovs-ctl(8) manpage documents
555 the "enable-protocol" command that can be used as an alternative.
556 - New CFM demand mode which uses data traffic to indicate interface
557 liveness.
558
559 v1.10.0 - 01 May 2013
560 ---------------------
561 - Bridge compatibility support has been removed. Any uses that
562 rely on ovs-brcompatd will have to stick with Open vSwitch 1.9.x
563 or adapt to native Open vSwitch support (e.g. use ovs-vsctl instead
564 of brctl).
565 - The maximum size of the MAC learning table is now configurable.
566 - With the Linux datapath, packets for new flows are now queued
567 separately on a per-port basis, so it should no longer be
568 possible for a large number of new flows arriving on one port to
569 prevent new flows from being processed on other ports.
570 - ovs-vsctl:
571 * Previously ovs-vsctl would retry connecting to the database forever,
572 causing it to hang if ovsdb-server was not running. Now, ovs-vsctl
573 only tries once by default (use --retry to try forever). This change
574 means that you may want to remove uses of --timeout to avoid hangs
575 in ovs-vsctl calls.
576 * Many "ovs-vsctl" database commands now accept an --if-exists option.
577 Please refer to the ovs-vsctl manpage for details.
578 - OpenFlow:
579 - Experimental support for newer versions of OpenFlow. See
580 the "What versions of OpenFlow does Open vSwitch support?"
581 question in the FAQ for more details.
582 - The OpenFlow "dp_desc" may now be configured by setting the
583 value of other-config:dp-desc in the Bridge table.
584 - It is possible to request the OpenFlow port number with the
585 "ofport_request" column in the Interface table.
586 - The NXM flow_removed message now reports the OpenFlow table ID
587 from which the flow was removed.
588 - Tunneling:
589 - New support for the VXLAN tunnel protocol (see the IETF draft here:
590 http://tools.ietf.org/html/draft-mahalingam-dutt-dcops-vxlan-03).
591 - Tunneling requires the version of the kernel module paired with
592 Open vSwitch 1.9.0 or later.
593 - Inheritance of the Don't Fragment bit in IP tunnels (df_inherit)
594 is no longer supported.
595 - Path MTU discovery is no longer supported.
596 - CAPWAP tunneling support removed.
597 - Tunnels with multicast destination ports are no longer supported.
598 - ovs-dpctl:
599 - The "dump-flows" and "del-flows" no longer require an argument
600 if only one datapath exists.
601 - ovs-appctl:
602 - New "vlog/disable-rate-limit" and "vlog/enable-rate-limit"
603 commands available allow control over logging rate limits.
604 - New "dpif/dump-dps", "dpif/show", and "dpif/dump-flows" command
605 that mimic the equivalent ovs-dpctl commands.
606 - The ofproto library is now responsible for assigning OpenFlow port
607 numbers. An ofproto implementation should assign them when
608 port_construct() is called.
609 - All dpif-based bridges of a particular type share a common
610 datapath called "ovs-<type>", e.g. "ovs-system". The ovs-dpctl
611 commands will now return information on that shared datapath. To
612 get the equivalent bridge-specific information, use the new
613 "ovs-appctl dpif/*" commands.
614 - Backward-incompatible changes:
615 - Earlier Open vSwitch versions treated ANY as a wildcard in flow
616 syntax. OpenFlow 1.1 adds a port named ANY, which introduces a
617 conflict. ANY was rarely used in flow syntax, so we chose to
618 retire that meaning of ANY in favor of the OpenFlow 1.1 meaning.
619 - Patch ports no longer require kernel support, so they now work
620 with FreeBSD and the kernel module built into Linux 3.3 and later.
621 - New "sample" action.
622
623
624 v1.9.0 - 26 Feb 2013
625 ------------------------
626 - Datapath:
627 - Support for ipv6 set action.
628 - SKB mark matching and setting.
629 - support for Linux kernels up to 3.8
630 - FreeBSD is now a supported platform, thanks to code contributions from
631 Gaetano Catalli, Ed Maste, and Giuseppe Lettieri.
632 - ovs-bugtool: New --ovs option to report only OVS related information.
633 - New %t and %T log escapes to identify the subprogram within a
634 cooperating group of processes or threads that emitted a log message.
635 The default log patterns now include this information.
636 - OpenFlow:
637 - Allow bitwise masking for SHA and THA fields in ARP, SLL and TLL
638 fields in IPv6 neighbor discovery messages, and IPv6 flow label.
639 - Adds support for writing to the metadata field for a flow.
640 - Tunneling:
641 - The tunneling code no longer assumes input and output keys are
642 symmetric. If they are not, PMTUD needs to be disabled for
643 tunneling to work. Note this only applies to flow-based keys.
644 - New support for a nonstandard form of GRE that supports a 64-bit key.
645 - Tunnel Path MTU Discovery default value was set to 'disabled'.
646 This feature is deprecated and will be removed soon.
647 - Tunnel header caching removed.
648 - ovs-ofctl:
649 - Commands and actions that accept port numbers now also accept keywords
650 that represent those ports (such as LOCAL, NONE, and ALL). This is
651 also the recommended way to specify these ports, for compatibility
652 with OpenFlow 1.1 and later (which use the OpenFlow 1.0 numbers
653 for these ports for different purposes).
654 - ovs-dpctl:
655 - Support requesting the port number with the "port_no" option in
656 the "add-if" command.
657 - ovs-pki: The "online PKI" features have been removed, along with
658 the ovs-pki-cgi program that facilitated it, because of some
659 alarmist insecurity claims. We do not believe that these claims
660 are true, but because we do not know of any users for this
661 feature it seems better on balance to remove it. (The ovs-pki-cgi
662 program was not included in distribution packaging.)
663 - ovsdb-server now enforces the immutability of immutable columns. This
664 was not enforced in earlier versions due to an oversight.
665 - The following features are now deprecated. They will be removed no
666 earlier than February 2013. Please email dev@openvswitch.org with
667 concerns.
668 - Bridge compatibility.
669 - Stable bond mode.
670 - The autopath action.
671 - Interface type "null".
672 - Numeric values for reserved ports (see "ovs-ofctl" note above).
673 - Tunnel Path MTU Discovery.
674 - CAPWAP tunnel support.
675 - The data in the RARP packets can now be matched in the same way as the
676 data in ARP packets.
677
678
679 v1.8.0 - 26 Feb 2013
680 ------------------------
681 *** Internal only release ***
682 - New FAQ. Please send updates and additions!
683 - Authors of controllers, please read the new section titled "Action
684 Reproduction" in DESIGN, which describes an Open vSwitch change in
685 behavior in corner cases that may affect some controllers.
686 - ovs-l3ping:
687 - A new test utility that can create L3 tunnel between two Open
688 vSwitches and detect connectivity issues.
689 - ovs-ofctl:
690 - New --sort and --rsort options for "dump-flows" command.
691 - "mod-port" command can now control all OpenFlow config flags.
692 - OpenFlow:
693 - Allow general bitwise masking for IPv4 and IPv6 addresses in
694 IPv4, IPv6, and ARP packets. (Previously, only CIDR masks
695 were allowed.)
696 - Allow support for arbitrary Ethernet masks. (Previously, only
697 the multicast bit in the destination address could be individually
698 masked.)
699 - New field OXM_OF_METADATA, to align with OpenFlow 1.1.
700 - The OFPST_QUEUE request now reports an error if a specified port or
701 queue does not exist, or for requests for a specific queue on all
702 ports, if the specified queue does not exist on any port. (Previous
703 versions generally reported an empty set of results.)
704 - New "flow monitor" feature to allow controllers to be notified of
705 flow table changes as they happen.
706 - Additional protocols are not mirrored and dropped when forward-bpdu is
707 false. For a full list, see the ovs-vswitchd.conf.db man page.
708 - Open vSwitch now sends RARP packets in situations where it previously
709 sent a custom protocol, making it consistent with behavior of QEMU and
710 VMware.
711 - All Open vSwitch programs and log files now show timestamps in UTC,
712 instead the local timezone, by default.
713
714
715 v1.7.0 - 30 Jul 2012
716 ------------------------
717 - kernel modules are renamed. openvswitch_mod.ko is now
718 openvswitch.ko and brcompat_mod.ko is now brcompat.ko.
719 - Increased the number of NXM registers to 8.
720 - Added ability to configure DSCP setting for manager and controller
721 connections. By default, these connections have a DSCP value of
722 Internetwork Control (0xc0).
723 - Added the granular link health statistics, 'cfm_health', to an
724 interface.
725 - OpenFlow:
726 - Added support to mask nd_target for ICMPv6 neighbor discovery flows.
727 - Added support for OpenFlow 1.3 port description (OFPMP_PORT_DESC)
728 multipart messages.
729 - ovs-ofctl:
730 - Added the "dump-ports-desc" command to retrieve port
731 information using the new port description multipart messages.
732 - ovs-test:
733 - Added support for spawning ovs-test server from the client.
734 - Now ovs-test is able to automatically create test bridges and ports.
735 - "ovs-dpctl dump-flows" now prints observed TCP flags in TCP flows.
736 - Tripled flow setup performance.
737 - The "coverage/log" command previously available through ovs-appctl
738 has been replaced by "coverage/show". The new command replies with
739 coverage counter values, instead of logging them.
740
741
742 v1.6.1 - 25 Jun 2012
743 ------------------------
744 - Allow OFPP_CONTROLLER as the in_port for packet-out messages.
745
746
747 v1.6.0 - 24 Feb 2012
748 ------------------------
749 *** Internal only release ***
750 - bonding
751 - LACP bonds no longer fall back to balance-slb when negotiations fail.
752 Instead they drop traffic.
753 - The default bond_mode changed from SLB to active-backup, to protect
754 unsuspecting users from the significant risks of SLB bonds (which are
755 documented in vswitchd/INTERNALS).
756 - Load balancing can be disabled by setting the bond-rebalance-interval
757 to zero.
758 - OpenFlow:
759 - Added support for bitwise matching on TCP and UDP ports.
760 See ovs-ofctl(8) for more information.
761 - NXM flow dumps now include times elapsed toward idle and hard
762 timeouts.
763 - Added an OpenFlow extension NXT_SET_ASYNC_CONFIG that allows
764 controllers more precise control over which OpenFlow messages they
765 receive asynchronously.
766 - New "fin_timeout" action.
767 - Added "fin_timeout" support to "learn" action.
768 - New Nicira action NXAST_CONTROLLER that offers additional features
769 over output to OFPP_CONTROLLER.
770 - When QoS settings for an interface do not configure a default queue
771 (queue 0), Open vSwitch now uses a default configuration for that
772 queue, instead of dropping all packets as in previous versions.
773 - Logging:
774 - Logging to console and file will have UTC timestamp as a default for
775 all the daemons. An example of the default format is
776 2012-01-27T16:35:17Z. ovs-appctl can be used to change the default
777 format as before.
778 - The syntax of commands and options to set log levels was simplified,
779 to make it easier to remember.
780 - New support for limiting the number of flows in an OpenFlow flow
781 table, with configurable policy for evicting flows upon
782 overflow. See the Flow_Table table in ovs-vswitch.conf.db(5)
783 for more information.
784 - New "enable-async-messages" column in the Controller table. If set to
785 false, OpenFlow connections to the controller will initially have all
786 asynchronous messages disabled, overriding normal OpenFlow behavior.
787 - ofproto-provider interface:
788 - "struct rule" has a new member "used" that ofproto implementations
789 should maintain by updating with ofproto_rule_update_used().
790 - ovsdb-client:
791 - The new option --timestamp causes the "monitor" command to print
792 a timestamp with every update.
793 - CFM module CCM broadcasts can now be tagged with an 802.1p priority.
794
795
796 v1.5.0 - 01 Jun 2012
797 ------------------------
798 - OpenFlow:
799 - Added support for querying, modifying, and deleting flows
800 based on flow cookie when using NXM.
801 - Added new NXM_PACKET_IN format.
802 - Added new NXAST_DEC_TTL action.
803 - ovs-ofctl:
804 - Added daemonization support to the monitor and snoop commands.
805 - ovs-vsctl:
806 - The "find" command supports new set relational operators
807 {=}, {!=}, {<}, {>}, {<=}, and {>=}.
808 - ovsdb-tool now uses the typical database and schema installation
809 directories as defaults.
810 - The default MAC learning timeout has been increased from 60 seconds
811 to 300 seconds. The MAC learning timeout is now configurable.
812
813
814 v1.4.0 - 30 Jan 2012
815 ------------------------
816 - Compatible with Open vSwitch kernel module included in Linux 3.3.
817 - New "VLAN splinters" feature to work around buggy device drivers
818 in old Linux versions. (This feature is deprecated. When
819 broken device drivers are no longer in widespread use, we will
820 delete this feature.) See ovs-vswitchd.conf.db(5) for more
821 information.
822 - OpenFlow:
823 - Added ability to match on IPv6 flow label through NXM.
824 - Added ability to match on ECN bits in IPv4 and IPv6 through NXM.
825 - Added ability to match on TTL in IPv4 and IPv6 through NXM.
826 - Added ability to modify ECN bits in IPv4.
827 - Added ability to modify TTL in IPv4.
828 - ovs-vswitchd:
829 - Don't require the "normal" action to use mirrors. Traffic will
830 now be properly mirrored for any flows, regardless of their
831 actions.
832 - Track packet and byte statistics sent on mirrors.
833 - The sFlow implementation can now usually infer the correct agent
834 device instead of having to be told explicitly.
835 - ovs-appctl:
836 - New "fdb/flush" command to flush bridge's MAC learning table.
837 - ovs-test:
838 - A new distributed testing tool that allows one to diagnose performance
839 and connectivity issues. This tool currently is not included in RH or
840 Xen packages.
841 - RHEL packaging now supports integration with Red Hat network scripts.
842 - bonding:
843 - Post 1.4.*, OVS will be changing the default bond mode from balance-slb
844 to active-backup. SLB bonds carry significant risks with them
845 (documented vswitchd/INTERNALS) which we want to prevent unsuspecting
846 users from running into. Users are advised to update any scripts or
847 configuration which may be negatively impacted by explicitly setting
848 the bond mode which they want to use.
849
850
851 v1.3.0 - 09 Dec 2011
852 ------------------------
853 - OpenFlow:
854 - Added an OpenFlow extension which allows the "output" action to accept
855 NXM fields.
856 - Added an OpenFlow extension for flexible learning.
857 - Bumped number of NXM registers from four to five.
858 - ovs-appctl:
859 - New "version" command to determine version of running daemon.
860 - If no argument is provided for "cfm/show", displays detailed
861 information about all interfaces with CFM enabled.
862 - If no argument is provided for "lacp/show", displays detailed
863 information about all ports with LACP enabled.
864 - ovs-dpctl:
865 - New "set-if" command to modify a datapath port's configuration.
866 - ovs-vswitchd:
867 - The software switch now supports 255 OpenFlow tables, instead
868 of just one. By default, only table 0 is consulted, but the
869 new NXAST_RESUBMIT_TABLE action can look up in additional
870 tables. Tables 128 and above are reserved for use by the
871 switch itself; please use only tables 0 through 127.
872 - Add support for 802.1D spanning tree (STP).
873 - Fragment handling extensions:
874 - New OFPC_FRAG_NX_MATCH fragment handling mode, in which L4
875 fields are made available for matching in fragments with
876 offset 0.
877 - New NXM_NX_IP_FRAG match field for matching IP fragments (usable
878 via "ip_frag" in ovs-ofctl).
879 - New ovs-ofctl "get-frags" and "set-frags" commands to get and set
880 fragment handling policy.
881 - CAPWAP tunneling now supports an extension to transport a 64-bit key.
882 By default it remains compatible with the old version and other
883 standards-based implementations.
884 - Flow setups are now processed in a round-robin manner across ports
885 to prevent any single client from monopolizing the CPU and conducting
886 a denial of service attack.
887 - Added support for native VLAN tagging. A new "vlan_mode"
888 parameter can be set for "port". Possible values: "access",
889 "trunk", "native-tagged" and "native-untagged".
890 - test-openflowd has been removed. Please use ovs-vswitchd instead.
891
892 v1.2.0 - 03 Aug 2011
893 ------------------------
894 - New "ofproto" abstraction layer to ease porting to hardware
895 switching ASICs.
896 - Packaging for Red Hat Enterprise Linux 5.6 and 6.0.
897 - Datapath support for Linux kernels up to 3.0.
898 - OpenFlow:
899 - New "bundle" and "bundle_load" action extensions.
900 - Database:
901 - Implement table unique constraints.
902 - Support cooperative locking between callers.
903 - ovs-dpctl:
904 - New "-s" option for "show" command prints packet and byte
905 counters for each port.
906 - ovs-ofctl:
907 - New "--readd" option for "replace-flows".
908 - ovs-vsctl:
909 - New "show" command to print an overview of configuration.
910 - New "comment" command to add remark that explains intentions.
911 - ovs-brcompatd has been rewritten to fix long-standing bugs.
912 - ovs-openflowd has been renamed test-openflowd and moved into the
913 tests directory. Its presence confused too many users. Please
914 use ovs-vswitchd instead.
915 - New ovs-benchmark utility to test flow setup performance.
916 - A new log level "off" has been added. Configuring a log facility
917 "off" prevents any messages from being logged to it. Previously,
918 "emer" was effectively "off" because no messages were ever logged at
919 level "emer". Now, errors that cause a process to exit are logged
920 at "emer" level.
921 - "configure" option --with-l26 has been renamed --with-linux, and
922 --with-l26-source has been renamed --with-linux-source. The old
923 names will be removed after the next release, so please update
924 your scripts.
925 - The "-2.6" suffix has been dropped from the datapath/linux-2.6 and
926 datapath/linux-2.6/compat-2.6 directories.
927 - Feature removals:
928 - Dropped support for "tun_id_from_cookie" OpenFlow extension.
929 Please use the extensible match extensions instead.
930 - Removed the Maintenance_Point and Monitor tables in an effort
931 to simplify 802.1ag configuration.
932 - Performance and scalability improvements
933 - Bug fixes
934
935 v1.1.0 - 05 Apr 2011
936 ------------------------
937 - Ability to define policies over IPv6
938 - LACP
939 - 802.1ag CCM
940 - Support for extensible match extensions to OpenFlow
941 - QoS:
942 - Support for HFSC qdisc.
943 - Queue used by in-band control can now be configured.
944 - Kernel:
945 - Kernel<->userspace interface has been reworked and should be
946 close to a stable ABI now.
947 - "Port group" concept has been dropped.
948 - GRE over IPSEC tunnels
949 - Bonding:
950 - New active backup bonding mode.
951 - New L4 hashing support when LACP is enabled.
952 - Source MAC hash now includes VLAN field also.
953 - miimon support.
954 - Greatly improved handling of large flow tables
955 - ovs-dpctl:
956 - "show" command now prints full vport configuration.
957 - "dump-groups" command removed since kernel support for
958 port groups was dropped.
959 - ovs-vsctl:
960 - New commands for working with the new Managers table.
961 - "list" command enhanced with new formatting options and --columns
962 option.
963 - "get" command now accepts new --id option.
964 - New "find" command.
965 - ovs-ofctl:
966 - New "queue-stats" command for printing queue stats.
967 - New commands "replace-flows" and "diff-flows".
968 - Commands to add and remove flows can now read from files.
969 - New --flow-format option to enable or disable NXM.
970 - New --more option to increase OpenFlow message verbosity.
971 - Removed "tun-cookie" command, which is no longer useful.
972 - ovs-controller enhancements for testing various features.
973 - New ovs-vlan-test command for testing for Linux kernel driver VLAN
974 bugs. New ovs-vlan-bug-workaround command for enabling and
975 disabling a workaround for these driver bugs.
976 - OpenFlow support:
977 - "Resubmit" actions now update flow statistics.
978 - New "register" extension for use in matching and actions, via NXM.
979 - New "multipath" experimental action extension.
980 - New support for matching multicast Ethernet frames, via NXM.
981 - New extension for OpenFlow vendor error codes.
982 - New extension to set the QoS output queue without actually
983 sending to an output port.
984 - Open vSwitch now reports a single flow table, instead of
985 separate hash and wildcard tables. This better models the
986 current implementation.
987 - New experimental "note" action.
988 - New "ofproto/trace" ovs-appctl command and associated utilities
989 to ease debugging complex flow tables.
990 - Database:
991 - Schema documentation now includes an entity-relationship diagram.
992 - The database is now garbage collected. In most tables,
993 unreferenced rows will be deleted automatically.
994 - Many tables now include statistics updated periodically by
995 ovs-vswitchd or ovsdb-server.
996 - Every table now has an "external-ids" column for use by OVS
997 integrators.
998 - There is no default controller anymore. Each bridge must have its
999 controller individually specified.
1000 - The "fail-mode" is now a property of a Bridge instead of a Controller.
1001 - New versioning and checksum features.
1002 - New Managers table and manager_options column in Open_vSwitch table
1003 for specifying managers. The old "managers" column in the
1004 Open_vSwitch table has been removed.
1005 - Many "name" columns are now immutable.
1006 - Feature removals:
1007 - Dropped support for XenServer pre-5.6.100.
1008 - Dropped support for Linux pre-2.6.18.
1009 - Dropped controller discovery support.
1010 - Dropped "ovs-ofctl status" and the OpenFlow extension that it used.
1011 Statistics reporting in the database is a rough equivalent.
1012 - Dropped the "corekeeper" package (now separate, at
1013 http://openvswitch.org/cgi-bin/gitweb.cgi?p=corekeeper).
1014 - Performance and scalability improvements
1015 - Bug fixes
1016
1017 v1.1.0pre2 - 13 Sep 2010
1018 ------------------------
1019 - Bug fixes
1020
1021 v1.1.0pre1 - 31 Aug 2010
1022 ------------------------
1023 - OpenFlow 1.0 slicing (QoS) functionality
1024 - Python bindings for configuration database (no write support)
1025 - Performance and scalability improvements
1026 - Bug fixes
1027
1028 v1.0.1 - 31 May 2010
1029 --------------------
1030 - New "patch" interface type
1031 - Bug fixes
1032
1033 v1.0.0 - 15 May 2010
1034 --------------------
1035 - Configuration database with remote management
1036 - OpenFlow 1.0
1037 - GRE tunneling
1038 - Support for XenServer 5.5 and 5.6
1039 - Performance and scalability improvements
1040 - Bug fixes
1041
1042 v0.99.2 - 18 Feb 2010
1043 ---------------------
1044 - Bug fixes
1045
1046 v0.99.1 - 25 Jan 2010
1047 ---------------------
1048 - Add support for sFlow(R)
1049 - Make headers compatible with C++
1050 - Bug fixes
1051
1052 v0.99.0 - 14 Jan 2010
1053 ---------------------
1054 - User-space forwarding engine
1055 - Bug fixes
1056
1057 v0.90.7 - 29 Nov 2009
1058 ---------------------
1059 - Add support for NetFlow active timeouts
1060 - Bug fixes
1061
1062 v0.90.6 - 6 Oct 2009
1063 --------------------
1064 - Bug fixes
1065
1066 v0.90.5 - 21 Sep 2009
1067 ---------------------
1068 - Generalize in-band control to more diverse network setups
1069 - Bug fixes