Protocol Action: Assured Forwarding PHB Group to Proposed Standard
The IESG <iesg-secretary@ietf.org> Fri, 02 April 1999 13:25 UTC
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From: The IESG <iesg-secretary@ietf.org>
Subject: Protocol Action: Assured Forwarding PHB Group to Proposed Standard
Date: Fri, 02 Apr 1999 08:11:09 -0500
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The IESG has approved the Internet-Drafts for publication as Proposed Standards: o Assured Forwarding PHB Group <draft-ietf-diffserv-af-06.txt> o An Expedited Forwarding PHB <draft-ietf-diffserv-phb-ef-02.txt> These documents are the product of the Differentiated Services Working Group. The IESG contact persons are Scott Bradner and Vern Paxson. Technical Summary The Assured Forwarding PHB Group (AF) document defines a general use group of Differentiated Services Per-Hop-Behaviors (PHBs ) which provide delivery of IP packets in four independently forwarded AF classes. Within each AF class, an IP packet can be assigned one of three different levels of drop precedence. A DS node does not reorder IP packets of the same microflow if they belong to the same AF class. The Expedited Forwarding PHB (EF) document defines a general use Differentiated Services Per-Hop-Behavior (PHB) which can be used to build a low loss, low latency, low jitter, assured bandwidth, end-to-end service. One example service that can br supported by the EF PHB is a "virtual leased line." Working Group Summary There was little working group disagreement over the Expedited Forwarding PHB proposal. There were only minor changes in response to the working group last-call. There was significant working group discussion over the details of the Assured Forwarding PHB Group document. The document underwent a number of revisions to resolve the issues. There was working group consensus on the final version. Protocol Quality These documents have been reviewed for the IESG by Scott Bradner. Notes to RFC Editor: 1. In I-D draft-ietf-diffserv-phb-ef-02.txt, please insert an "IANA considerations" section as follows: This document allocates one codepoint, 101110, in Pool 1 of the code space defined by [RFC2474]. 2. In I-D draft-ietf-diffserv-af-06.txt, please insert after the first occurrence of the word "microflow" in section 1: , as defined in [Nichols], 3. Please insert the word "However, " before the sentence The traffic conditioning actions MUST NOT cause reordering of packets of the same microflow. in the first paragraph of Section 3. 4. In I-D draft-ietf-diffserv-af-06.txt, please insert an "IANA Considerations" section as follows: This document allocates twelve codepoints, listed in section 6, in Pool 1 of the code space defined by [Nichols].