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 argument syntax conventions.

ARRAY PARAMETERS
       Like commands, specification of parameters is in the domain of individual  objects  (and	 their	com‐
       mands)  as well. However, 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 leav‐
       ing 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	com‐
       bined  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)