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Re: [Dcrouting] New Version Notification for draft-li-dynamic-flooding-01.txt

Tony Li <tony1athome@gmail.com> Tue, 23 January 2018 22:09 UTC

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From: Tony Li <tony1athome@gmail.com>
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Date: Tue, 23 Jan 2018 14:09:12 -0800
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Cc: "dcrouting@ietf.org" <dcrouting@ietf.org>
To: "Jakob Heitz (jheitz)" <jheitz@cisco.com>
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Subject: Re: [Dcrouting] New Version Notification for draft-li-dynamic-flooding-01.txt
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Hi Jakob,

Thank you for the kind words!

> This looks to me like a good idea.
> It does not require a separate management network.
> A small flooding topology would be a spanning tree.
> This would assume that upon a link failure, both ends of a p2p link detect the failure and send an LSA within an acceptable time.


Which is possible, but it also implies that systems on the other side of the failure would only see one side of the failure immediately and the other side might take some time to propagate. While SPF might still calculate good results, I would definitely prefer to see a fully consistent database sooner rather than later. Also, if there is a second failure on the far side of the first failure, that might be invisible for some time.


> If not, then I would add a second link to any nodes that have only one link in the spanning tree.


And this is why I suggested a cyclic topology with minimal diameter and minimal node degree.

Tony

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