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Conference 7.286::fddi

Title:	FDDI - The Next Generation

Moderator:	NETCAD::STEFANI

Created:	Thu Apr 27 1989
Last Modified:	Thu Jun 05 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	2259
Total number of notes:	8590

63.0. "Concentrator Features...?" by CSOA1::SEITZ (LOST-IN-SPACE) Mon May 14 1990 17:59

    I have been reviewing a copy of the FDDI System Level Description which
    I expect will be published shortly...
    
    Within the description on concentrator operation, it states that a
    concentrator will look at the destination address on each frame and, if
    not destined for an address connected to that concentrator, nor the
    concentrators own address, it will send it immediately out to the next 
    concentrator on the ring.
    
    1. Is this true?
    
    2. Is this a special feature for Digital concentrators or is this part
    of the standard?
    
    3. It would seem that this could be quite a performance feature. Will
    this functionality work for addresses on other concentrators further
    out the tree?

T.R	Title	User	Personal Name	Date	Lines
63.1	where can I find this article (and others...)	ZPOV03::HWCHOY	FE110000	`Mon May 14 1990 22:36`	1

63.2	Concentrator myth	LEVERS::CIARFELLA	Saabless and happy	`Tue May 15 1990 10:26`	13
	Nope, this is not how a concentrator operates. If the concentrator has a MAC in it, then the MAC will 'look' at the destination address (DA) on each frame and copy it if the DA matches its own address, one of the supported multicast addresses, or the broadcast address. It does not try to match addresses of other stations connected to it. Do you have the most current version of the system level description? The earliest versions were incorrect in much of their descriptions of how these stations operate. Paul C
63.3	Location of misleading data	CSOA1::SEITZ	LOST-IN-SPACE	`Tue May 15 1990 12:15`	8
	The copy of the System Level Description I have is stamped "FINAL REVIEW". The offending section is the second paragraph on page 3-4. One other note...the document makes no mention of the redundant capabilities identified in note 59.0. It does have a nice little chart that could lead you to believe this but only if you knew what you were looking for.
63.4		KONING::KONING	NI1D @FN42eq	`Tue May 15 1990 13:37`	7
	There are lots of different versions of that document, all labelled "final review". Please tell us what the date on the cover is. One thing is certain: the description as you quoted it bears no resemblance whatsoever to the truth. paul
63.5	DATE=February 1990	CSOA1::SEITZ	LOST-IN-SPACE	`Tue May 15 1990 16:24`	1

63.6		KONING::KONING	NI1D @FN42eq	`Tue May 15 1990 17:43`	13
	Throw it away. That one is way out of date. I queried the writer, here's his answer... From: LEAF::PBOCCELLI Date: 15-May-90 01:43 PM To: KONING::KONING cc: PBOCCELLI Subject: RE: I assume/hope this refers to an out of date review copy... Yes, you assume correctly. That person must have an older review copy of the manual. Paul
63.7	latest?	COMICS::WOODWARD	Smile!	`Wed May 16 1990 06:41`	3
	Where is the "latest" version ? Steve
63.8		KONING::KONING	NI1D @FN42eq	`Wed May 16 1990 12:11`	4
	It's being printed. Order it from wherever you order such things when it comes out... (No, I don't know the order number.) paul