CGDCBXD(8) libcgroup Manual CGDCBXD(8)NAMEcgdcbxd - control group dcb event net_prio daemon
DESCRIPTIONcgdcbxd 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‐
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.
OPTIONS-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 (http://www.ieee802.org/1/pages/dcbridges.html) o
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‐
SEE ALSOcgrulesengd(8), cgrules.conf(5)lldpad(8), lldptool(8),
John Fastabend <email@example.com>
Linux 2012-01-16 CGDCBXD(8)