Manual: dcb

DCB(8)							    Linux						      DCB(8)

NAME
       dcb - show / manipulate DCB (Data Center Bridging) settings

SYNOPSIS
       dcb [ OPTIONS ] { app | buffer | ets | maxrate | pfc } { COMMAND | help }

       dcb [ -force ] -batch filename

       dcb [ OPTIONS ] help

OPTIONS
       -n, --netns 
	      switches dcb to the specified network namespace NETNS.

       -V, --Version
	      Print the version of the dcb utility and exit.

       -b, --batch 
	      Read  commands  from  provided file or standard input and invoke them. First failure will cause termination of
	      dcb.

       -f, --force
	      Don't terminate dcb on errors in batch mode. If there were any errors during execution of	 the  commands,	 the
	      application return code will be non zero.

       -i, --iec
	      When showing rates, use ISO/IEC 1024-based prefixes (Ki, Mi, Bi) instead of the 1000-based ones (K, M, B).

       -j, --json
	      Generate JSON output.

       -N, --Numeric
	      If the subtool in question translates numbers to symbolic names in some way, suppress this translation.

       -p, --pretty
	      When combined with -j generate a pretty JSON output.

       -s, --statistics
	      If the object in question contains any statistical counters, shown them as part of the "show" output.

OBJECTS
       app    - Configuration of application priority table

       buffer - Configuration of port buffers

       ets    - Configuration of ETS (Enhanced Transmission Selection)

       maxrate
	      - Configuration of per-TC maximum transmit rate

       pfc    - Configuration of PFC (Priority-based Flow Control)

COMMANDS
       A COMMAND specifies the action to perform on the object. The set of possible actions depends on the object type. As a
       rule,  it is possible to show objects and to invoke topical help, which prints a list of available commands and argu‐
       ment syntax conventions.

ARRAY PARAMETERS
       Like commands, specification of parameters is in the domain of individual objects (and their commands) as well.	How‐
       ever, much of the DCB interface revolves around arrays of fixed size that specify one value per some key, such as per
       traffic class or per priority. There is therefore a single syntax for adjusting elements of these arrays. It consists
       of a series of KEY:VALUE pairs, where the meaning of the individual keys and values depends on the parameter.

       The  elements  are evaluated in order from left to right, and the latter ones override the earlier ones. The elements
       that are not specified on the command line are queried from the kernel and their current value is retained.

       As an example, take a made-up parameter tc-juju, which can be set to charm traffic in a given  TC  with	either	good
       luck  or bad luck. KEY can therefore be 0..7 (as is usual for TC numbers in DCB), and VALUE either of none, good, and
       bad. An example of changing a juju value of TCs 0 and 7, while leaving all other intact, would then be:

       # dcb foo set dev eth0 tc-juju 0:good 7:bad

       A special key, all, is recognized which sets the same value to all array elements. This	can  be	 combined  with	 the
       usual  single-element  syntax. E.g. in the following, the juju of all keys is set to none, except 0 and 7, which have
       other values:

       # dcb foo set dev eth0 tc-juju all:none 0:good 7:bad

EXIT STATUS
       Exit status is 0 if command was successful or a positive integer upon failure.

SEE ALSO
       dcb-app(8), dcb-apptrust(8), dcb-buffer(8), dcb-ets(8), dcb-maxrate(8), dcb-pfc(8), dcb-rewr(8)

REPORTING BUGS
       Report any bugs to the Network Developers mailing list  where the development and maintenance
       is primarily done.  You do not have to be subscribed to the list to send a message there.

AUTHOR
       Petr Machata 

iproute2					       19 October 2020						      DCB(8)