Ascend Archive
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Re: (ASCEND) STAC Compression?
At 10:06 AM 2/20/98 +0900, Junichi Kurokawa wrote:
>As a sidenote,
>
>In <19980219121020.05803@ibh-dd.de>, Andre Beck <beck@ibh.de> wrote:
>
> >On Tue, Feb 17, 1998 at 04:04:55PM -0800, Laurent Saehyun Kim wrote:
> >>
> >> One of our customers has Symplex router and he was asking about STAC
> >> compression. Does Max4004 support STAC compression? If so, how do I go
> >> about enabling it?
> >
> >The Max actually supports 3 different kinds of Stac LZS implementation:
> >
> >1) Stac (Ascend native version)
>
>This first "Stac" is Ascend's adaptation of Cisco's broken, RFC
>incompliant implementation of the compression that many other RAS
>vendors also resorted to implement, only for the sake of Cisco
>connectivity.
>
> >2) Stac-9 (Draft 9 version aka RFC1974)
>
>Yes, this _is_ Stac.
>
> >3) MS-Stac (Mickeysoft MCPP or such aka RFC2118)
> >
> >The real question is what the peer speaks. I would try Stac-9 first, then
> >MS-Stac, then Stac. If nothing works you may have found YAPSI (yet another
> >proprietary Stac implementation), but chances are that any decent device
> >supports RFC1974.
>
>When one knows that the peer is a Cisco, he or she can try the above (1)
>Stac first.
>
> >BTW, is 1) documented anywhere ? Is it the extended LZS that was RFC'ed
> >by Adtran ? Or Ascend internal use only ?
>
>Implemented by Cisco and many others.
>
>Corrections are welcomed. Thanks.
OK, I'll correct. STAC or the first Ascend STAC has nothing whatsoever to
do with Cisco. And to be fair, Cisco's first STAC wasn't broken either.
Both implementations were pre-standard. Each vendor implemented STAC as
they thought best. Neither was compliant when RFC 1974 was finalized so
both had to update their STAC code. Both have older versions running to
this day out in customer networks, so we still have to deal with this.
Matt Holdrege http://www.ascend.com matt@ascend.com
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