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IETF RFC 6660
[ACTIVE]

Encoding Three Pre-Congestion Notification (PCN) States in the IP Header Using a Single Diffserv Codepoint (DSCP)

Metadata

Publisher
IETF
Doc Type
Standard
Pages
24
Abstract
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 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 that 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 reusing 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 Diffserv codepoint (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 RFC 5696. [STANDARDS-TRACK]
Publication Date
2012-07-01
Status Note
Proposed Standard
DOI
10.17487/RFC6660
Link
https://doi.org/10.17487/RFC6660
Author(s)
Bob Briscoe
Toby Moncaster
Michael Menth
Keyword(s)
Quality Of Service, QoS, Congestion Control, Congestion Notification, Tunnel, DiffServ, Integrated Services, Protocol
Latest version of IETF RFC 6660

Document Versions — IETF RFC 6660

  • ▶ IETF RFC 6660 (2012-07-01)
    THIS DOC [ACTIVE] [LATEST VERSION]

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IETF RFC 6660, Encoding Three Pre-Congestion Notification (PCN) States in the IP Header Using a Single Diffserv Codepoint (DSCP). Available at https://doi.org/10.17487/RFC6660
Snippet:
IETF RFC 6660, Encoding Three Pre-Congestion Notification (PCN) States in the IP Header Using a Single Diffserv Codepoint (DSCP). Available at https://doi.org/10.17487/RFC6660

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IETF RFC 6660, Encoding Three Pre-Congestion Notification (PCN) States in the IP Header Using a Single Diffserv Codepoint (DSCP). Available at https://doi.org/10.17487/RFC6660
Snippet:
<span class="citation"><cite>IETF RFC 6660</cite>, Encoding Three Pre-Congestion Notification (PCN) States in the IP Header Using a Single Diffserv Codepoint (DSCP). Available at <a href="https://doi.org/10.17487/RFC6660" target="_blank" rel="noopener">https://doi.org/10.17487/RFC6660</a></span>

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IETF RFC 6660, Encoding Three Pre-Congestion Notification (PCN) States in the IP Header Using a Single Diffserv Codepoint (DSCP)
doi: 10.17487/RFC6660
url: https://doi.org/10.17487/RFC6660
Snippet:
<li>
<cite id="bib-rfc6660">IETF RFC 6660</cite>, Encoding Three Pre-Congestion Notification (PCN) States in the IP Header Using a Single Diffserv Codepoint (DSCP)
<span class="doi">10.17487/RFC6660</span>
</li>

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