Re: Is dual homing easy?

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#243

From: Vernon Schryver
Date: Mon, 12 Oct 1992 16:02

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In article <1992Oct12.060447.1035@anza.3com.com>, root@anza.3com.com (Operator) writes:
> DART@SLACVM.SLAC.STANFORD.EDU (415) writes:
> Exactly as you expected. The DAS can be connected as a SAS with a
> backup link to the second concentrator. This mean your server 1 is
> single attached to the ring at anytime. Also I presume your
> concentrator and your DAS server interface are all supporting Dual
> homing.

As Paul wrote, the concentrators do not have to support "dual homing".
A concentrator cannot tell if the host is dual homed or note.

How can a compliant DAS station not support dual homing?  I think even
back to SMT-6.2 dual homing was implicitly present.

Note that some of us have had bugs in our DAS stations with respect to
switching between A and B ports, and so were not entirely compliant.
(The polite will not ask me for a list of vendors with such bugs.
Besides, by Interop91 they were fixed.)

Vernon Schryver,  vjs@sgi.com

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References: <92281.150913DART@SLACVM.SLAC.STANFORD.EDU> <1992Oct12.060447.1035@anza.3com.com>

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Newsgroups: comp.dcom.lans.fddi
Path: arc1-ca.pugleaf.net!sparky!uunet!charon.amdahl.com!pacbell.com!sgiblab!spool.mu.edu!agate!ames!sgi!rhyolite!vjs
From: vjs@rhyolite.wpd.sgi.com (Vernon Schryver)
Subject: Re: Is dual homing easy?
Message-ID: <r0d0lgk@rhyolite.wpd.sgi.com>
Organization: Silicon Graphics, Inc.  Mountain View, CA
References: <92281.150913DART@SLACVM.SLAC.STANFORD.EDU> <1992Oct12.060447.1035@anza.3com.com>
Date: Mon, 12 Oct 1992 16:02:50 GMT
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