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Re: IPv6 Traffic class field or DS field ??

2000-08-24 10:10:02
At 01:09 PM 8/23/00 +0100, Nikki Cranley wrote:
I have been reading the RFC's relating to IPv6 for some insight to the replacement for the ipv4 TOS field. In rfc 2460, there is talk about a traffic class field and then in rfc 2474 it talks about a differentiated services field. Could anyone tell me which has been "accepted" and if so where I could find out more details about this particular field and the various priorities etc. as I am interested in trying to use this field for some qos mechanisms.

The IPv6 traffic class field is discussed in RFCs 2460, 2473, 2474, 2553, and internet drafts draft-iab-case-for-ipv6-06.txt and draft-ietf-ipngwg-rfc2553bis-00.txt . Section 7 of RFC 2460 makes it clear that the intended content of the traffic class field is identifical with the 8 bits containing the TOS byte and the "CU" field described in the Differentiated Services context.

In addition, RFC 2473 goes on to define the DS Field, making these two equivalent.

   Differentiated Services Field: the IPv4 header TOS octet or the IPv6
   Traffic Class octet when interpreted in conformance with the
   definition given in this document.  Also DS field.

You may find information about Differentiated Services and the DS Field in

2474 Definition of the Differentiated Services Field (DS Field) in the
     IPv4 and IPv6 Headers. K. Nichols, S. Blake, F. Baker, D. Black.
     December 1998. (Format: TXT=50576 bytes) (Obsoletes RFC1455, RFC1349)
     (Status: PROPOSED STANDARD)

2475 An Architecture for Differentiated Service. S. Blake, D. Black,
     M. Carlson, E. Davies, Z. Wang, W. Weiss. December 1998. (Format:
     TXT=94786 bytes) (Status: INFORMATIONAL)

2597 Assured Forwarding PHB Group. J. Heinanen, F. Baker, W. Weiss, J.
     Wroclawski. June 1999. (Format: TXT=24068 bytes) (Status: PROPOSED
     STANDARD)

2598 An Expedited Forwarding PHB. V. Jacobson, K. Nichols, K. Poduri.
June 1999. (Format: TXT=23656 bytes) (Status: PROPOSED STANDARD)


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