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List:       linux1394-user
Subject:    RE: Help required on IP over 1394
From:       Stefan Richter <stefanr () s5r6 ! in-berlin ! de>
Date:       2004-08-30 13:57:43
Message-ID: 740cb3408d848eb3612098009a155c93 () localhost
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On 2004-08-30 Sreehari_Babu wrote:
> With your reply i understand that using IEEE 1394b cards though we 
> connect
> in a ring topology as the PHY of the nodes resolves this to a daisy 
> chain to
> form a tree structure. Hence we can practically use the ring topology 
> also
> with out any problem.
> Please correct me if I am wrong.

You are right. The 1394b PHYs implement a strategy that disables
ports if their activation would create a loop. As far as I understand,
physical loops are therefore allowed in pure 1394b nets.

> This option seems better as any breakage of a single connection in the
> network will still be intact and all the nodes are reachable.

Agreed. This is not only useful if cables are temporarily taken out,
but also when a node in the middle of the network is powered down.
Ports that were disabled before because of loop detection would then
be automatically activated as needed.
-- 
Stefan Richter
http://arcgraph.de/sr/



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