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[Lajos Katona <1505627@xxxxxxxxxxxxxxxxxx>]

As I see the history we can close this with won't fix if you think
please reopen this RFE

** Changed in: neutron
       Status: Triaged => Won't Fix

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https://bugs.launchpad.net/bugs/1505627

Title:
  [RFE] QoS Explicit Congestion Notification (ECN) Support

Status in neutron:
  Won't Fix

Bug description:
  [Existing problem]
  Network congestion can be very common in large data centers generating huge traffic from multiple hosts. Though each hosts can use IP header TOS ECN bit functionality to implement explicit congestion notification [1]_ but this will be a redundant effort.

  [Proposal]
  This proposal talks about achieving ECN on behalf of each host. This will help in making the solution centralized and can be done per tenant level. In addition to this traffic classification for applying ECN functionality can also be achieved via specific filtering rules, if required. Almost all the leading vendors support this option for better QoS [2]_.

  Existing QoS framework is limited only to bandwidth rate limiting and
  be extend for supporting explicit congestion notification (RFC 3168
  [3]_).

  [Benefits]
  - Enhancement to the existing QoS functionality.

  [What is the enhancement?]
  - Add ECN support to the QoS extension.
  - Add additional command lines for realizing ECN functionality.
  - Add OVS support.

  [Related information]
  [1] ECN Wiki
     http://en.wikipedia.org/wiki/Explicit_Congestion_Notification
  [2] QoS
     https://review.openstack.org/#/c/88599/
  [3] RFC 3168
     https://tools.ietf.org/html/rfc3168
  [4] Specification
      https://blueprints.launchpad.net/neutron/+spec/explicit-congestion-notification
  [5] Specification Discussion: https://etherpad.openstack.org/p/QoS_ECN
  [6] OpenVSwitch support for ECN : http://openvswitch.org/support/dist-docs/ovs-ofctl.8.txt
  [7] Etherpad Link : https://etherpad.openstack.org/p/QoS_ECN

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