ovs-dpctl(8)                  Open vSwitch Manual                 ovs-dpctl(8)

       ovs-dpctl - administer Open vSwitch datapaths

       ovs-dpctl [options] command [switch] [args...]

       The ovs-dpctl program can create, modify, and delete Open vSwitch data‐
       paths.  A single machine may host any number of datapaths.

       This program works only with datapaths that are implemented outside  of
       ovs-vswitchd  itself,  such as the Linux and Windows kernel-based data‐
       paths.  To manage datapaths that are integrated into ovs-vswitchd, such
       as  the  userspace  (netdev)  datapath, use ovs-appctl(8) to invoke the
       dpctl/* commands, which are documented in ovs-vswitchd(8).

       A newly created datapath is associated with only one network device,  a
       virtual  network device sometimes called the datapath's ``local port''.
       A newly created datapath is not, however, associated with  any  of  the
       host's  other  network  devices.  To intercept and process traffic on a
       given network device, use the add-if command  to  explicitly  add  that
       network device to the datapath.

       If ovs-vswitchd(8) is in use, use ovs-vsctl(8) instead of ovs-dpctl.

       Most  ovs-dpctl commands that work with datapaths take an argument that
       specifies the name of the  datapath.   Datapath  names  take  the  form
       [type@]name, where name is the network device associated with the data‐
       path's local port.   If  type  is  given,  it  specifies  the  datapath
       provider of name, otherwise the default provider system is assumed.

       The following commands manage datapaths.  Do not use commands to add or
       remove or modify datapaths if ovs-vswitchd is running because this  in‐
       terferes with ovs-vswitchd's own datapath management.

       add-dp dp [netdev[,option]...]
              Creates datapath dp, with a local port also named dp.  This will
              fail if a network device dp already exists.

              If netdevs are specified, ovs-dpctl adds them to the  new  data‐
              path, just as if add-if was specified.

       del-dp dp
              Deletes  datapath  dp.  If dp is associated with any network de‐
              vices, they are automatically removed.

       add-if dp netdev[,option]...
              Adds each netdev to the set of network devices datapath dp moni‐
              tors,  where  dp is the name of an existing datapath, and netdev
              is the name of one of the host's  network  devices,  e.g.  eth0.
              Once a network device has been added to a datapath, the datapath
              has complete ownership of the network device's traffic  and  the
              network device appears silent to the rest of the system.

              A  netdev  may be followed by a comma-separated list of options.
              The following options are currently supported:

                     Specifies the type of port to add.  The default  type  is

                     Requests  a specific port number within the datapath.  If
                     this option is not specified then one will  be  automati‐
                     cally assigned.

                     Adds an arbitrary key-value option to the port's configu‐

              ovs-vswitchd.conf.db(5) documents the available port  types  and

       set-if dp port[,option]...
              Reconfigures  each  port  in  dp as specified.  An option of the
              form key=value adds the specified key-value option to  the  port
              or  overrides  an  existing  key's value.  An option of the form
              key=, that is, without a value, deletes the key-value named key.
              The  type  and  port number of a port cannot be changed, so type
              and port_no are only allowed if they match the existing configu‐

       del-if dp netdev...
              Removes each netdev from the list of network devices datapath dp

              Prints the name of each configured datapath on a separate line.

       [-s | --statistics] show [dp...]
              Prints a summary of configured datapaths, including their  data‐
              path  numbers  and  a  list of ports connected to each datapath.
              (The local port is identified as port 0.)  If -s or --statistics
              is specified, then packet and byte counters are also printed for
              each port.

              The datapath numbers consists of flow stats and mega  flow  mask

              The  "lookups"  row  displays three stats related to flow lookup
              triggered by processing incoming packets in the datapath.  "hit"
              displays number of packets matches existing flows. "missed" dis‐
              plays the number of packets not matching any existing  flow  and
              require  user space processing.  "lost" displays number of pack‐
              ets destined for user space process but subsequently dropped be‐
              fore  reaching  userspace. The sum of "hit" and "miss" equals to
              the total number of packets datapath processed.

              The "flows" row displays the number of flows in datapath.

              The "masks" row displays the mega flow mask stats. This  row  is
              omitted  for datapath not implementing mega flow. "hit" displays
              the total number of masks visited for matching incoming packets.
              "total" displays number of masks in the datapath. "hit/pkt" dis‐
              plays the average number of masks visited per packet; the  ratio
              between "hit" and total number of packets processed by the data‐

              If one or more datapaths  are  specified,  information  on  only
              those  datapaths  are  displayed.  Otherwise, ovs-dpctl displays
              information about all configured datapaths.

       The following commands are primarily useful for debugging Open vSwitch.
       The  flow  table entries (both matches and actions) that they work with
       are not OpenFlow flow entries.  Instead, they are different and consid‐
       erably  simpler flows maintained by the Open vSwitch kernel module.  Do
       not use  commands  to  add  or  remove  or  modify  datapath  flows  if
       ovs-vswitchd  is  running because it interferes with ovs-vswitchd's own
       datapath flow management.  Use  ovs-ofctl(8),  instead,  to  work  with
       OpenFlow flow entries.

       The  dp argument to each of these commands is optional when exactly one
       datapath exists, in which case that datapath is the default.  When mul‐
       tiple datapaths exist, then a datapath name is required.

       [-m  |  --more]  [--names | --no-names] dump-flows [dp] [filter=filter]
              Prints to the console all flow entries in datapath dp's flow ta‐
              ble.   Without  -m  or  --more, output omits match fields that a
              flow wildcards entirely; with -m or --more, output includes  all
              wildcarded fields.

              If  filter=filter  is  specified,  only  displays the flows that
              match the filter. filter is a flow in the form similiar to  that
              accepted  by  ovs-ofctl(8)'s  add-flow  command. (This is not an
              OpenFlow flow: besides  other  differences,  it  never  contains
              wildcards.)   The  filter  is  also  useful  to match wildcarded
              fields   in   the   datapath   flow.   As   an   example,   fil
              ter='tcp,tp_src=100'  will  match  the  datapath flow containing

              If type=type is specified, only displays flows of the  specified
              types.  type is a comma separated list, which can contain any of
              the following:
                 ovs - displays flows handled in the ovs dp
                 tc - displays flows handled in the tc dp
                 offloaded - displays flows offloaded to the HW
                 non-offloaded - displays flows not offloaded to the HW
                 all - displays all the types of flows

              By default all the types of flows are displayed.

       add-flow [dp] flow actions

       [--clear] [--may-create] [-s | --statistics] mod-flow [dp] flow actions
              Adds or modifies a flow in dp's flow table that, when  a  packet
              matching flow arrives, causes actions to be executed.

              The  add-flow command succeeds only if flow does not already ex‐
              ist in dp.  Contrariwise,  mod-flow  without  --may-create  only
              modifies  the  actions for an existing flow.  With --may-create,
              mod-flow will add a new flow or modify an existing one.

              If -s or --statistics is specified,  then  mod-flow  prints  the
              modified  flow's statistics.  A flow's statistics are the number
              of packets and bytes that have  passed  through  the  flow,  the
              elapsed  time  since the flow last processed a packet (if ever),
              and (for TCP flows) the union of the TCP flags processed through
              the flow.

              With  --clear,  mod-flow  zeros  out the flow's statistics.  The
              statistics printed if -s or --statistics is also  specified  are
              those from just before clearing the statistics.

              NOTE:  flow  and  actions  do  not  match  the  syntax used with
              ovs-ofctl(8)'s add-flow command.

              Usage Examples

              Forward ARP between ports 1 and 2 on datapath myDP:

                     ovs-dpctl add-flow myDP \
                       "in_port(1),eth(),eth_type(0x0806),arp()" 2

                     ovs-dpctl add-flow myDP \
                       "in_port(2),eth(),eth_type(0x0806),arp()" 1

              Forward all IPv4 traffic between two addresses on ports 1 and 2:

                     ovs-dpctl add-flow myDP \
                        ipv4(src=,dst=" 2

                     ovs-dpctl add-flow myDP \
                        ipv4(src=,dst=" 1

       [-s | --statistics] del-flow [dp] flow
              Deletes the flow from dp's flow table that matches flow.  If  -s
              or  --statistics  is specified, then del-flow prints the deleted
              flow's statistics.

       [-m | --more] [--names | --no-names] get-flow [dp] ufid:ufid
              Fetches the flow from dp's flow  table  with  unique  identifier
              ufid.   ufid  must  be  specified  as a string of 32 hexadecimal

       del-flows [dp]
              Deletes all flow entries from datapath dp's flow table.

       The following commands are useful for  debugging  and  configuring  the
       connection tracking table in the datapath.

       The  dp argument to each of these commands is optional when exactly one
       datapath exists, in which case that datapath is the default.  When mul‐
       tiple datapaths exist, then a datapath name is required.

       N.B.(Linux  specific): the system datapaths (i.e. the Linux kernel mod‐
       ule Open vSwitch datapaths) share a single  connection  tracking  table
       (which is also used by other kernel subsystems, such as iptables, nfta‐
       bles and the regular host stack).  Therefore, the following commands do
       not apply specifically to one datapath.

       [-m | --more] [-s | --statistics] dump-conntrack [dp] [zone=zone]
              Prints  to the console all the connection entries in the tracker
              used by dp.  If zone=zone is specified, only shows  the  connec‐
              tions  in  zone.   With --more, some implementation specific de‐
              tails are included. With --statistics  timeouts  and  timestamps
              are added to the output.

       flush-conntrack [dp] [zone=zone] [ct-tuple]
              Flushes  the  connection entries in the tracker used by dp based
              on zone and connection tracking tuple ct-tuple.  If ct-tuple  is
              not  provided, flushes all the connection entries.  If zone=zone
              is specified, only flushes the connections in zone.

              If ct-tuple is provided, flushes the connection entry  specified
              by  ct-tuple  in  zone. The zone defaults to 0 if it is not pro‐
              vided.  The userspace connection tracker requires flushing  with
              the original pre-NATed tuple and a warning log will be otherwise
              generated.  An example of an IPv4 ICMP ct-tuple:


              An example of an IPv6 TCP ct-tuple:


       [-m | --more] ct-stats-show [dp] [zone=zone]
              Displays the number of connections grouped by protocol  used  by
              dp.  If zone=zone is specified, numbers refer to the connections
              in zone.  With --more, groups by connection state for each  pro‐

       ct-bkts [dp] [gt=threshold]
              For  each  conntrack  bucket, displays the number of connections
              used by dp.  If gt=threshold is specified,  bucket  numbers  are
              displayed  when the number of connections in a bucket is greater
              than threshold.

       ct-set-maxconns [dp] maxconns
              Sets the maximum limit of connection tracker entries to maxconns
              on  dp.   This  can be used to reduce the processing load on the
              system due to connection tracking or simply limiting  connection
              tracking.   If the number of connections is already over the new
              maximum limit request then the new maximum  limit  will  be  en‐
              forced  when  the number of connections decreases to that limit,
              which normally happens due to connection expiry.  Only supported
              for userspace datapath.

       ct-get-maxconns [dp]
              Prints  the  maximum  limit of connection tracker entries on dp.
              Only supported for userspace datapath.

       ct-get-nconns [dp]
              Prints the current number of connection tracker entries  on  dp.
              Only supported for userspace datapath.

       ct-set-limits [dp] [default=default_limit] [zone=zone,limit=limit]...
              Sets  the  maximum allowed number of connections in a connection
              tracking zone.  A specific zone may be set to limit, and  multi‐
              ple  zones  may  be specified with a comma-separated list.  If a
              per-zone limit for a particular zone is  not  specified  in  the
              datapath,  it defaults to the default per-zone limit.  A default
              zone may be specified with the  default=default_limit  argument.
              Initially,  the  default per-zone limit is unlimited.  An unlim‐
              ited number of entries may be set with 0 limit.  Only  supported
              for Linux kernel datapath.

       ct-del-limits [dp] zone=zone[,zone]...
              Deletes  the connection tracking limit for zone.  Multiple zones
              may be specified with a comma-separated  list.   Only  supported
              for Linux kernel datapath.

       ct-get-limits [dp] [zone=zone[,zone]...]
              Retrieves  the maximum allowed number of connections and current
              counts per-zone.  If zone is given, only the  specified  zone(s)
              are printed.  If no zones are specified, all the zone limits and
              counts are provided.  The command always  displays  the  default
              zone limit.  Only supported for Linux kernel datapath.

              Limits  ovs-dpctl runtime to approximately secs seconds.  If the
              timeout expires, ovs-dpctl will exit with a SIGALRM signal.

              Sets logging levels.  Without any spec, sets the log  level  for
              every  module and destination to dbg.  Otherwise, spec is a list
              of words separated by spaces or commas or colons, up to one from
              each category below:

              •      A  valid  module name, as displayed by the vlog/list com‐
                     mand on ovs-appctl(8), limits the log level change to the
                     specified module.

              •      syslog,  console,  or file, to limit the log level change
                     to only to the system log, to the console, or to a  file,
                     respectively.    (If  --detach  is  specified,  ovs-dpctl
                     closes its standard file descriptors, so logging  to  the
                     console will have no effect.)

                     On  Windows platform, syslog is accepted as a word and is
                     only useful along with the  --syslog-target  option  (the
                     word has no effect otherwise).

              •      off,  emer,  err,  warn, info, or dbg, to control the log
                     level.  Messages of the given severity or higher will  be
                     logged,  and  messages of lower severity will be filtered
                     out.  off filters out all  messages.   See  ovs-appctl(8)
                     for a definition of each log level.

              Case is not significant within spec.

              Regardless  of  the  log  levels set for file, logging to a file
              will not take place unless --log-file is also specified (see be‐

              For compatibility with older versions of OVS, any is accepted as
              a word but has no effect.

              Sets the maximum logging verbosity level, equivalent  to  --ver

              Sets  the  log  pattern  for  destination  to pattern.  Refer to
              ovs-appctl(8) for a description of the valid syntax for pattern.

              Sets the RFC5424 facility of the log message.  facility  can  be
              one  of kern, user, mail, daemon, auth, syslog, lpr, news, uucp,
              clock, ftp, ntp, audit, alert, clock2, local0,  local1,  local2,
              local3,  local4, local5, local6 or local7. If this option is not
              specified, daemon is used as the default for  the  local  system
              syslog  and local0 is used while sending a message to the target
              provided via the --syslog-target option.

              Enables logging to a file.  If file is  specified,  then  it  is
              used  as  the exact name for the log file.  The default log file
              name   used   if   file    is    omitted    is    /var/log/open

              Send  syslog  messages  to  UDP port on host, in addition to the
              system syslog.  The host must be a numerical IP address,  not  a

              Specify method how syslog messages should be sent to syslog dae‐
              mon.  Following forms are supported:

              •      libc, use libc syslog() function.  Downside of using this
                     options  is  that libc adds fixed prefix to every message
                     before it is actually sent  to  the  syslog  daemon  over
                     /dev/log UNIX domain socket.

              •      unix:file, use UNIX domain socket directly.  It is possi‐
                     ble to specify arbitrary message format with this option.
                     However,  rsyslogd  8.9 and older versions use hard coded
                     parser function anyway that  limits  UNIX  domain  socket
                     use.   If  you  want to use arbitrary message format with
                     older rsyslogd versions, then use UDP socket to localhost
                     IP address instead.

              •      udp:ip:port, use UDP socket.  With this method it is pos‐
                     sible to use arbitrary message  format  also  with  older
                     rsyslogd.   When  sending syslog messages over UDP socket
                     extra precaution needs to be taken into account, for  ex‐
                     ample,  syslog daemon needs to be configured to listen on
                     the specified UDP port, accidental iptables  rules  could
                     be  interfering  with  local syslog traffic and there are
                     some security considerations that apply to  UDP  sockets,
                     but do not apply to UNIX domain sockets.

              •      null, discards all messages logged to syslog.

              The  default  is  taken  from  the OVS_SYSLOG_METHOD environment
              variable; if it is unset, the default is libc.

       --help Prints a brief help message to the console.

              Prints version information to the console.

       ovs-appctl(8), ovs-vswitchd(8)

Open vSwitch                        2.10.90                       ovs-dpctl(8)