Provided by: lldpad_0.9.43+git20111215.c0498b-1_amd64 bug


       ETS-{CFG|REC} - Show / manipulate ETS TLV configuration


       lldptool -t -i ethx -V ETS-CFG <-c CONFIG_ARG ...>

           CONFIG_ARG := { enableTx | willing | tsa | up2tc | numtcs | tcbw }

       lldptool -T -i ethx -V ETS-CFG CONFIG_ARG=value ...

           CONFIG_ARG :=

            enableTx = {yes|no} |

            willing = {yes|no} |

            tsa = tc:{ets|strict|vendor},... |

            up2tc = priority:tc,... |

            tcbw = bw1,bw2,...

       lldptool -t -i ethx -V ETS-REC <-c CONFIG_ARG ...>

       lldptool -T -i ethx -V ETS-REC CONFIG_ARG=value ...

           CONFIG_ARG :=

            enableTx = {yes|no} |

            tsa = tc:{ets|strict|vendor},... |

            up2tc = priority:tc,... |

            tcbw = bw1,bw2,...


       The  Extended  Transmission  Selection  (ETS)  feature  has  a  recommendation  TLV  and a
       configuration TLV configured with ETS-REC and ETS-CFG respectively.


              Enables the ETS TLV to be transmitted

              Sets the ETS-CFG willing bit

       tsa    Transmission selection algorithm, sets a comma separated list of traffic classes to
              the corresponding selection algorithm. Valid algorithms include "ets", "strict" and

       up2tc  Comma separated list mapping user priorities to traffic classes.

       tcbw   Comma separated list of bandwiths for each traffic  class  the  first  value  being
              assigned  to traffic class 0 and the second to traffic class 1 and so on. Undefined
              bandwidths are presumed to be 0.

       numtcs Sets/Displays the number of ETS supported traffic classes.

Theory of Operations

       IEEE 802.1Qaz is enabled by default on hardware  that  supports  this  mode  indicated  by
       support  for  the  DCBNL  interface.  Kernel  config option CONFIG_DCB. The ETS-CFG TLV is
       advertised by default with the attributes indicated  by  querying  the  hardware  for  its
       current  configuration. A valid configuration is to map all priorities to a single traffic
       class and use the link strict selection algorithm. This is equivalent to being in  a  non-
       DCB enabled mode.

       To  support  legacy  CEE  DCBX  the  ETS-CFG and ETS-REC TLVs are disabled if a CEE TLV is
       received and there are no valid IEEE 802.1Qaz TLVs present. At this time the hardware DCBX
       mode  will  be set to CEE and IEEE mode is disabled. This allows switches to be configured
       and end nodes will then be configured accordingly without any  configuration  required  on
       the end node.

       Mapping  applications  and  protocols to traffic classes is required for ETS to be useful.
       User space programs can encode the priority of an application with the SO_PRIORITY option.
       Low  level drivers that support priority to traffic class mappings may enable this mode by
       default. For drivers that do not support this mode manual configuration can  support  this
       mode of operation see tc-mqprio(8) and tc-multiq.  Additionally, tc qdiscs and filters can
       be used to map protocols to queues see tc(8) for more details along these lines.  Finally,
       many drivers have support for specific protocols ie Fiber Channel over Ethernet (FCoE).


       Configure willing bit for interface eth2
              lldptool -T -i eth2 -V ETS-CFG willing=yes

       Configure traffic classes for ETS and strict priority on eth2
              lldptool -T -i eth2 -V ETS-CFG tsa=0:ets,1:ets,2:ets,3:ets,4:strict,5:strict

       Configure 1:1 mapping from priority to traffic classes on eth2
              lldptool -T -i eth2 -V ETS-CFG up2tc=0:0,1:1,2:2,3:3,4:4,5:5,6:6,7:7

       Display local configured ETS-CFG parameters for tcbw
              lldptool -t -i eth2 -V ETS-CFG -c tcbw

       Display last transmitted ETS-CFG TLV
              lldptool -t -i eth2 -V ETS-CFG

       Configure ETS-CFG and ETS-REC for default DCB on eth2
              lldptool  -T -i eth2 -V ETS-CFG tsa=0:ets,1:ets,2:ets,3:ets,4:ets,5:ets,6:ets,7:ets
              up2tc=0:0,1:1,2:2,3:3,4:4,5:5,6:6,7:7 tcbw=12,12,12,12,13,13,13,13

              lldptool -T -i eth2 -V ETS-REC  tsa=0:ets,1:ets,2:ets,3:ets,4:ets,5:ets,6:ets,7:ets
              up2tc=0:0,1:1,2:2,3:3,4:4,5:5,6:6,7:7 tcbw=12,12,12,12,13,13,13,13


       o      IEEE 802.1Qaz (


       Support for tc-mqprio was added in 2.6.38 on older kernels other mechanisms may need to be
       used to map applications to traffic classes.


       lldptool(8), lldptool-app(8), lldpad(8), tc-mqprio(8),


       John Fastabend