On Thu, Nov 19, 2015 at 11:50:32PM +0000, Gregory Mirsky wrote:
> Dear All,
> I believe I have couple question to how inet:dscp defined and would greatly
> appreciate your guidance, suggestions and help.
> I’ve found int:dscp definition as:
> typedef dscp {
> type uint8 {
> range "0..63";
> }
> description
> "The dscp type represents a Differentiated Services Code Point
> that may be used for marking packets in a traffic stream.
> In the value set and its semantics, this type is equivalent
> to the Dscp textual convention of the SMIv2.";
> reference
> "RFC 3289<http://www.ietf.org/rfc/rfc3289.txt>: Management
> Information Base for the Differentiated
> Services Architecture
> RFC 2474<http://www.ietf.org/rfc/rfc2474.txt>: Definition of the
> Differentiated Services Field
> (DS Field) in the IPv4 and IPv6 Headers
> RFC 2780<http://www.ietf.org/rfc/rfc2780.txt>: IANA Allocation
> Guidelines For Values In
> the Internet Protocol and Related Headers";
>
> }
> Couple notes on the definition:
>
> · DSCP defined in RFC 2474 and RFC 3260. RFC 3260 is not listed as
> reference;
>
> · Though DiffServ MIB, defined in RFC 3289, had defined DSCP values
> to be in 0…63 range, RFC 3260 explicitly differentiated standardized
> codepoints from unknown or improperly mapped DSCP codepoints. The fact is
> that standardized DSCP codepoints do not represent contiguous range as
> recorded in IANA DSCP
> Registry<http://www.iana.org/assignments/dscp-registry/dscp-registry.xhtml>.
>
> · And here’s my question Should inet:dscp be defined based
> exclusively on standardized DSCP codepoints as other values are non-standard?
>
The inet:dscp type models the 6-bit DSCP value, it does not
distinguish between standard and experimental values within the
codepoint space.
/js
--
Juergen Schoenwaelder Jacobs University Bremen gGmbH
Phone: +49 421 200 3587 Campus Ring 1 | 28759 Bremen | Germany
Fax: +49 421 200 3103 <http://www.jacobs-university.de/>
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