cgdcbxd man page on Oracle

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CGDCBXD(8)		       libcgroup Manual			    CGDCBXD(8)

       cgdcbxd - control group dcb event net_prio daemon

       cgdcbxd [options]

       cgdcbxd	is  a daemon used to monitor DCB netlink events and manage the
       net_prio control group subsystem. The daemon keeps  the	hierarchy  and
       priority mappings in sync with DCBX Application events.

       When a DCB netlink event is received cgdcbxd parses the application TLV
       and identifies new, updated, and deleted application tuples.  The  DCBX
       application  TLV	 uses the selector, protocol ID and priority fields to
       identify and set application priority. The selector field specifies the
       protocol ID type supported types are

       Ethertype = 1
       TCP or SCTP = 2
       UDP or DCCP = 3
       TCP, SCTP UDP, and DCCP = 4

       The  protocol ID field specifies the port or ethertype depending on the
       selector field and the priority gives a priority value (0-7).  Used  to
       set the net_prio.ifpriomap.

       When  a	new  application tuple is identified cgdcbxd creates a control
       group under the net_prio subsystem using the  directory	cgdcbx-<selec‐

       The  <selector>	field  uses  the IEEE selector values listed above for
       both CEE DCBX and IEEE DCBX versions.

       This control group will be managed by cgdcbx and the ifpriomap will  be
       kept  in	 sync with the application TLV. If a DCB netlink event removes
       the application selector-protocolID tuple then cgdcbx removes the  con‐
       trol group.

       This  may  be  used with cgrulesengd to create configuration rules that
       map applications and users to  DCBX  selector-protocolID	 tuples.  Note
       protocol	 ID  and  selector values use the well-known protocol type and
       port or ethertype  defined  by  the  IANA  (Internet  Assigned  Numbers
       Authority) the application are not required to use the well-known ports
       this is only used to identify the application.

       -h     Display help.

       -n     Don't fork the daemon, stay in the foreground.

       -v     Show version

       the default libcgroup configuration file

       o      IEEE 802.1Qaz (  o
	      IANA    (‐

       Support for the net_prio subsystem was added in the 3.3 Linux kernel.

       SIGUSR1 dumps list of managed interfaces and control groups  with  pri‐

       cgrulesengd(8), cgrules.conf(5) lldpad(8), lldptool(8),

       John Fastabend <>

Linux				  2012-01-16			    CGDCBXD(8)

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