Re: [Sdn] I-D Action: draft-xia-sdnrg-service-description-language-02.txt

["Susan Hares" <[e-mail]>]

Albrecht: 

Would it be acceptable to have a short summary in the document, and point to another document with in-depth review of these other languages? 

Sue 

-----Original Message-----
From: sdn [mailto:[e-mail]] On Behalf Of Schwarz, Albrecht (Albrecht)
Sent: Tuesday, May 05, 2015 6:00 AM
To: [e-mail]; [e-mail]
Subject: Re: [Sdn] I-D Action: draft-xia-sdnrg-service-description-language-02.txt

Appreciate your comment Huub!
Like to make a comment in a similar direction:
The draft should provide an explicit section on sth like "Inventory of existing languages" in that field, after the requirements section (clause 3) and the language design section (current clause 4) because there are already a plenty of languages in that field!
SDN is all about the control of traffic flows based on packets, i.e., all existing languages in that area a firstly applicable as "service description language" (at the southband interface).
Such kind of languages are known as
- policy specification languages (PSL), or
- policy  expression  languages  (PEL)  or
- filter  specification  languages  (FSL) or
- sth similar.
There are already more than 20 PSLs (to my knowldege).
The notion of "language" indicates a) a level of abstraction and b) the need for a final compilation/interpretation for its usage in a packet processing element.

The indicated examples seems to express typical configurations in such PSLs.
Thus, the draft needs a strong justification "why another language" in that field.

My cents,
Albrecht


-----Original Message-----
From: sdn [mailto:[e-mail]] On Behalf Of Huub van Helvoort
Sent: Dienstag, 5. Mai 2015 10:26
To: [e-mail]
Subject: Re: [Sdn] I-D Action: draft-xia-sdnrg-service-description-language-02.txt

Authors:

Just to avoid any confusion: I assume this is *not* the Specification and Description Language (SDL) described by the ITU-T in recommendations
Z.100  http://www.itu.int/ITU-T/recommendations/rec.aspx?rec=11387

Regards, Huub.

--------------

On 04-05-15 11:59, [e-mail] wrote:
>
> A New Internet-Draft is available from the on-line Internet-Drafts directories.
>
>
>          Title           : Requirements for a Service Description Language and Design Considerations
>          Authors         : Yinben Xia
>                            Sheng Jiang
>                            Susan Hares
> 	Filename        : draft-xia-sdnrg-service-description-language-02.txt
> 	Pages           : 7
> 	Date            : 2015-05-04
>
> Abstract:
>     The more and more complicated IP networks require a new interaction
>     mechanism between their customers and their networks.  A service
>     description language is needed to enable customers to easily describe
>     their diverse intent.  SDN controller would compile the user intent
>     into device configurations.  This document analyzes requirements for
>     such service description language and gives considerations for
>     designing such service description language.
>
>
> The IETF datatracker status page for this draft is:
> https://datatracker.ietf.org/doc/draft-xia-sdnrg-service-description-l
> anguage/
>
> There's also a htmlized version available at:
> https://tools.ietf.org/html/draft-xia-sdnrg-service-description-langua
> ge-02
>
> A diff from the previous version is available at:
> https://www.ietf.org/rfcdiff?url2=draft-xia-sdnrg-service-description-
> language-02
>
>
> Please note that it may take a couple of minutes from the time of 
> submission until the htmlized version and diff are available at tools.ietf.org.
>
> Internet-Drafts are also available by anonymous FTP at:
> ftp://ftp.ietf.org/internet-drafts/
>
> _______________________________________________
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> Internet-Draft directories: http://www.ietf.org/shadow.html or 
> ftp://ftp.ietf.org/ietf/1shadow-sites.txt
>


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