[6tisch] MSF / 6top - Error Handling for Bandwidth Allocation exceeding available capacity

Christian Hopfner <christian.hopfner@pcm.endress.com> Tue, 25 September 2018 08:49 UTC

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From: Christian Hopfner <christian.hopfner@pcm.endress.com>
To: "6tisch@ietf.org" <6tisch@ietf.org>
Thread-Topic: MSF / 6top - Error Handling for Bandwidth Allocation exceeding available capacity
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Date: Tue, 25 Sep 2018 08:49:32 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/6tisch/UDu8wa0Pu7_gcAGQ_VocA3WP-kI>
Subject: [6tisch] MSF / 6top - Error Handling for Bandwidth Allocation exceeding available capacity
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Hello,

I have not found an answer to my question yet, reading through 6top and msf draft. Is there anything foreseen signaling that a node does not have any bandwidth capacity remaining (max active cells reached, with respect to given policy).

Let’s assume we have a network with 4 nodes where node R is parent of nodes A and B. Node C is child of A and requires more bandwidth. But A has no additional bandwidth available.

Node C indicates a 6P ADD to node A which is answered with 6P_SUCCESS but with an empty cellist (2-step transaction). I guess next time node C can try 3-step transaction giving node A the opportunity to propose a cellist.
In case Node A has no cells to propose the response should contain RC_ERR_CELLLIST error correct?

But at the end Node C may end up in a loop trying to get more bandwidth unless node B becomes its preferred parent isn’t it?

If there would be an error code signaling “out of bandwidth” the SF may trigger a parent switch towards a neighbor which can handle the required traffic.



Mit freundlichen Grüßen I Best regards

Christian Hopfner

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