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Re: (ASCEND) STAC Compression?



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.


						jun@sinfony.ad.jp
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