Congestion notification process for real time traffic
This presentation is the property of its rightful owner.
Sponsored Links
1 / 5

Congestion Notification Process for Real-Time Traffic PowerPoint PPT Presentation


  • 55 Views
  • Uploaded on
  • Presentation posted in: General

Congestion Notification Process for Real-Time Traffic. draft-babiarz-tsvwg-rtecn-00.txt. Kwok Ho Chan [email protected] Jozef Babiarz [email protected] 59 th IETF, March 1, 2004. DiffServ Field & Explicit Congestion Notification.

Download Presentation

Congestion Notification Process for Real-Time Traffic

An Image/Link below is provided (as is) to download presentation

Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author.While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server.


- - - - - - - - - - - - - - - - - - - - - - - - - - E N D - - - - - - - - - - - - - - - - - - - - - - - - - -

Presentation Transcript


Congestion notification process for real time traffic

Congestion Notification Process for Real-Time Traffic

draft-babiarz-tsvwg-rtecn-00.txt

Kwok Ho Chan

[email protected]

Jozef Babiarz

[email protected]

59th IETF, March 1, 2004


Congestion notification process for real time traffic

DiffServ Field & Explicit Congestion Notification

Explicit Congestion Notification (ECN) reserved for bits 6 & 7

0

1

2

3

4

5

6

7

ECN

DSCP

0

15

4

8

31

Version

HLen

DS field

Length

Identification

Flags

Fragment offset

IP

header

TTL

Protocol

Header checksum

Source address

Destination address

Data

The DiffServ (DS) Field is an 8-bit field in the IP header and is defined in RFC 2474.

  • The first six bits contain the DiffServ Code Points (DSCP).

  • The two least significant bits (LSBs) of the DiffServ Field (bits 6 & 7) are used for Explicit Congestion Notifications (ECN) RFC 3168 defines method for TCP flows.

Congestion Notification Process for Real-Time Traffic 59th IETF


Major points

Major Points

  • ECN marking for real-time non TCP flows

    • Does not impact ECN for TCP (RFC 3168)

  • Meter real-time flows

  • Mark ECN bits if congestion detected

  • Metering and marking is deploy only where needed

  • Requires separation of real-time flows

  • Reaction to ECN marking is the responsibility of end devices / application

Congestion Notification Process for Real-Time Traffic 59th IETF


Usage

Usage

  • Flow admission control of real-time traffic

  • Rate control of established flows

  • Features

    • Allows end-to-end control

    • Based on current network load conditions

    • Selective deployment of metering and ECN marking in network

    • End stations need to support ECN capability

Congestion Notification Process for Real-Time Traffic 59th IETF


Next steps

Next Steps

  • Would like to request that this draft be considered as a workgroup item

Congestion Notification Process for Real-Time Traffic 59th IETF


  • Login