ip-precedence for management traffic

Paul Ferguson fergdawgster at gmail.com
Thu Dec 31 02:15:25 CST 2009

Hash: SHA1

On Thu, Dec 31, 2009 at 12:08 AM, Fred Baker <fred at cisco.com> wrote:

> RFC 4594 would suggest using DSCP CS2 (010000xx in the TOS byte; xx is
> the ECN flags). Section 3.1 discusses the issues with CS7, which is the
> DSCP counterpart to the deprecated IP Precedence 7. RFCs 2474/2475
> discuss the Differentiated Services Architecture and its implementation.
> http://www.ietf.org/rfc/rfc4594.txt
> 4594 Configuration Guidelines for DiffServ Service Classes. J.
>     Babiarz, K. Chan, F. Baker. August 2006. (Format: TXT=144044 bytes)
>     (Status: INFORMATIONAL)
> http://www.ietf.org/rfc/rfc2474.txt
> 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)
>     (Updated by RFC3168, RFC3260) (Status: PROPOSED STANDARD)
> http://www.ietf.org/rfc/rfc2475.txt
> 2475 An Architecture for Differentiated Service. S. Blake, D. Black,
>     M. Carlson, E. Davies, Z. Wang, W. Weiss. December 1998. (Format:
>     TXT=94786 bytes) (Updated by RFC3260) (Status: INFORMATIONAL)

I feel compelled to say that once a packet leaves you administrative
control, all bets are off, of course.

IP Precedence flagging is not an honored "bit" in The Internet.

Of course, if you own the end-to-end path, anything is possible.

- - ferg

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"Fergie", a.k.a. Paul Ferguson
 Engineering Architecture for the Internet
 ferg's tech blog: http://fergdawg.blogspot.com/

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