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

NAME         top

       ovs-dpctl-top - Top like behavior for ovs-dpctl dump-flows

SYNOPSIS         top

       ovs-dpctl-top [-h] [-v] [-f FLOWFILES] [-V] [-s] [--host HOST] [-a |
       --accumulate] [--accumulate-decay ACCUMULATEDECAY] [-d DELAY]

DESCRIPTION         top

       This program summarizes ovs-dpctl flow content by aggregating the
       number of packets, total bytes and occurrence of the following

              - Datapath in_port

              - Ethernet type

              - Source and destination MAC addresses

              - IP protocol

              - Source and destination IPv4 addresses

              - Source and destination IPv6 addresses

              - UDP and TCP destination port

              - Tunnel source and destination addresses

   Output shows four values:
              - FIELDS: the flow fields for example in_port(1).

              - COUNT: the number of lines in the dump-flow output contain
              the flow field.

              - PACKETS: the total number of packets containing the flow

              - BYTES: the total number of bytes containing the flow field.
              If units are not present then values are in bytes.

              - AVERAGE: the average packets size (BYTES/PACKET).

   Top Behavior
       While in top mode, the default behavior, the following single
       character commands are supported:

              a - toggles top in accumulate and live mode.  Accumulate mode
              is described below.

              s - toggles which column is used to sort content in decreasing
              order.  A DESC title is placed over the column.

              _ - a space indicating to collect dump-flow content again

              h - halt output.  Any character will restart sampling

              f - cycle through flow fields

              q - q for quit.

   Accumulate Mode
       There are two supported modes: live and accumulate.  The default is
       live.  The parameter --accumulate  or the 'a' character in top mode
       enables the latter.  In live mode, recent dump-flow content is
       presented.  Where as accumulate mode keeps track of the prior
       historical information until the flow is reset not when the flow is
       purged.  Reset flows are determined when the packet count for a flow
       has decreased from its previous sample.  There is one caveat,
       eventually the system will run out of memory if, after the
       accumulate-decay period any flows that have not been refreshed are
       purged.  The goal here is to free memory of flows that are not
       active.  Statistics are not decremented.  Their purpose is to reflect
       the overall history of the flow fields.

   Debugging Errors
       Parsing errors are counted and displayed in the status line at the
       beginning of the output.  Use the --verbose option with --script to
       see what output was not parsed, like this:

       $ ovs-dpctl dump-flows | ovs-dpctl-top --script --verbose

       Error messages will identify content that failed to parse.

   Access Remote Hosts
       The --host must follow the format user@hostname.  This script simply
       calls 'ssh user@Hostname' without checking for login credentials
       therefore public keys should be installed on the system identified by
       hostname, such as:

       $ ssh-copy-id user@hostname

       Consult ssh-copy-id man pages for more details.

   Expected usage
       $ ovs-dpctl-top

       or to run as a script:

       $ ovs-dpctl dump-flows > dump-flows.log

       $ ovs-dpctl-top --script --flow-file dump-flows.log

       -h, --help
              show this help message and exit.

       -v, --version
              show program's version number and exit.

       -f FLOWFILES, --flow-file FLOWFILES
              file containing flows from ovs-dpctl dump-flow.

       -V, --verbose
              enable debug level verbosity.

       -s, --script
              Run from a script (no user interface).

       --host HOST
              Specify a user@host for retrieving flows see Accessing Remote
              Hosts for more information.

       -a, --accumulate
              Accumulate dump-flow content.

       --accumulate-decay ACCUMULATEDECAY
              Decay old accumulated flows.  The default is 5 minutes. A
              value of 0 disables decay.

       -d DELAY, --delay DELAY
              Delay in milliseconds to collect dump-flow content (sample

COLOPHON         top

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       this manual page, send it to  This page was
       obtained from the project's upstream Git repository
       ⟨⟩ on 2020-02-08.  (At that
       time, the date of the most recent commit that was found in the repos‐
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Open vSwitch                       2.11.90                  ovs-dpctl-top(8)