A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Congestion and Pre-Congestion Notification Working Group of the IETF.
Title : Encoding 3 PCN-States in the IP header using a single DSCP
Author(s) : Bob Briscoe
Toby Moncaster
Michael Menth
Filename : draft-ietf-pcn-3-in-1-encoding-09.txt
Pages : 26
Date : 2012-03-11
The objective of Pre-Congestion Notification (PCN) is to protect the
quality of service (QoS) of inelastic flows within a Diffserv domain.
The overall rate of the PCN-traffic is metered on every link in the
PCN domain, and PCN-packets are appropriately marked when certain
configured rates are exceeded. Egress nodes pass information about
these PCN-marks to decision points which then decide whether to admit
or block new flow requests or to terminate some already-admitted
flows during serious pre-congestion.
This document specifies how PCN-marks are to be encoded into the IP
header by re-using the Explicit Congestion Notification (ECN)
codepoints within a PCN-domain. The PCN wire protocol for non-IP
protocol headers will need to be defined elsewhere. Nonetheless,
this document clarifies the PCN encoding for MPLS in an informational
Appendix. The encoding for IP provides for up to three different PCN
marking states using a single DSCP: Not-marked (NM), Threshold-marked
(ThM) and Excess-traffic-marked (ETM). Hence, it is called the
3-in-1 PCN encoding. This document obsoletes RFC5696.
A URL for this Internet-Draft is:
http://www.ietf.org/internet-drafts/draft-ietf-pcn-3-in-1-encoding-09.txt
Internet-Drafts are also available by anonymous FTP at:
ftp://ftp.ietf.org/internet-drafts/
This Internet-Draft can be retrieved at:
ftp://ftp.ietf.org/internet-drafts/draft-ietf-pcn-3-in-1-encoding-09.txt
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