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From: Tappan@G.BBN.COM (Dan Tappan)
Newsgroups: mod.protocols.appletalk
Subject: Re: InterBridge + FastPath = ?
Message-ID: <8609230034.AA17454@ucbvax.Berkeley.EDU>
Date: Mon, 22-Sep-86 18:00:21 EDT
Article-I.D.: ucbvax.8609230034.AA17454
Posted: Mon Sep 22 18:00:21 1986
Date-Received: Mon, 22-Sep-86 23:37:48 EDT
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Approved: info-applebus@c.cs.cmu.edu

You probably don't need to do RTMP across the ethernet, it would be
sufficent to let the masterbridge know about the indirect routes to
both (all) interbridged nets. 

Note that you want to be real careful in setting up linked appletalk
nets. The way the MAC RTMP stub is implimented you can have two linked 
nets

	[mac]		[mac]
	------[bridge]-----

or a star with no mac's on the center cable

	[mac]
	-------[bridge]|
		       |             [mac]
	-----[bridge]------[bridge]-------
			|
			etc

but anything more complicated than that then the packets start getting
sent to a non-optimum bridge ((N-1)/N of the time) and travelling over the
appletalk cable twice. Cuts the usable appletalk bandwidth in half.
Basicly you need to think of the appletalk internet as a tree,
and mac's can go only on the leaves.

Has anyone seen a specification for ZIP yet? For that matter, my 
'Inside Appletalk' is from Spring '85: are there enough changes that
it would be worthwhile my updating it? It would be nice if Apple 
publicized it when they changed the specifications.

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