Fwd: Re: [Sis-ipo] Shim Byte for IP over CCSDS

[Greg Kazz]

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>Date: Fri, 15 Aug 2008 00:58:18 +0100
>To: Greg Kazz <greg.j.kazz at jpl.nasa.gov>, sis-ipo at mailman.ccsds.org
>From: Lloyd Wood <lwood at cisco.com>
>Subject: Re: [Sis-ipo] Shim Byte for IP over CCSDS
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>Supporting 2-byte Ethertypes and that namespace strikes me as 
>sensible if protocols other than IP are to be carried; these 
>Ethertypes are everywhere in many protocols (e.g. PWE3 for carriage 
>of many other protocols.)
>
>It's worth observing the advantages of an alternative solution that 
>gets discussed occasionally: that IP header compression is already 
>agreed for Frame Relay (FRF.20, June 2001, which works with 
>RFC2507/2508), and that the MPoFR multiprotocol over Frame Relay can 
>be carried over CCSDS's bitstream service, using HDLC encoding. HDLC 
>(ISO 13239), is, like some CCSDS protocols, a full ISO standard; ISO 
>standards should (and should be expected to) support one another.
>
>CCSDS carrying HDLC/MPoFR would reduce the need for additional work 
>for protocols other than IP direct over CCSDS. Supporting HDLC and 
>carrying frame relay also avoids the need for translation of the 
>frame relay header into the smaller CCSDS shim, discarding 
>information, that is discussed in slide 5 of the viewgraphs. It also 
>reaches the goal of a transition from IP HC use with MPoFR on 
>terrestrial networks as easily as possible.  I notice the mention of 
>"(misconceptions?)" related to mention of HDLC in the RID text 
>document circulated earlier, and would like to know more about the 
>reasons for those statements.
>
>Are there any plans to leverage the ROHC advanced compression work?
>
>thanks,
>
>L.
>
>
>At Thursday 14/08/2008 10:58 -0700, Greg Kazz wrote:
> >All,
> >
> >Attached is a set of viewgraphs for your consideration. They 
> summarize the RID that has been written by the NASA Constellation 
> Project against the IP over CCSDS Red book. (this RID was sent to 
> you in a previous email).
> >
> >It offers a solution to the NASA Constellation requirement to do 
> IP header compression using RFC 2507 and 2508.
> >
> >I believe it is a reasonable solution given that it does not 
> impact the format of the CCSDS Encapsulation Packet, rather it adds 
> a shim byte after the Encapsulation packet header (See page 6) but 
> before the user data frame or packet.
> >
> >This RID wil be discussed at the IP over CCSDS meeting in Berlin.
> >
> >Questions for all:
> >
> >1. This RID which advocates the use of a shim byte has provision 
> for additional bytes so that other protocol/packet formats can be 
> added at a later date if needed. Does anyone foresee such a need?
> >
> >2. If this RID is approved, in which CCSDS book should this 
> information go?  A new and separate blue book that addresses this 
> Shim protocol? Perhaps if protocols other than IP need to be 
> addressed. Or at this time, since we know this shim involves IP 
> header compression, it only belongs in the IP over CCSDS magenta 
> book.  You thoughts?
> >
> >best regards,
> >
> >Greg Kazz
> >Chairman IP over CCSDS WG
> >
> >
> >
> >
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