Re: [6tisch] Question/Comment on draft-chang-6tisch-6top-msf
Thomas Watteyne <thomas.watteyne@inria.fr> Wed, 15 November 2017 08:43 UTC
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From: Thomas Watteyne <thomas.watteyne@inria.fr>
Date: Wed, 15 Nov 2017 09:43:17 +0100
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To: Tengfei Chang <tengfei.chang@inria.fr>
Cc: john rubis <john.rubis@hotmail.com>, "6tisch@ietf.org" <6tisch@ietf.org>
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Subject: Re: [6tisch] Question/Comment on draft-chang-6tisch-6top-msf
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John, What you describe is the intended behavior. Thomas On Wed, Nov 15, 2017 at 9:30 AM, Tengfei Chang <tengfei.chang@inria.fr> wrote: > Hi John, > > Before switching parent, the node still can keep synchronized to it's old > parent through the TXRXSHARED cell. That cell is only shared between the > node and its parent. > The keepalive on TXRXSHARED cell should be able to keep the node > synchronized. > > Tengfei > > On Wed, Nov 15, 2017 at 12:34 AM, john rubis <john.rubis@hotmail.com> > wrote: > >> I think the MSF draft states/infers this, but I wanted to verify. >> >> >> >> In the case a node has a valid preferred parent and wishes to switch to a >> new one then: >> >> >> >> Dedicated link(s) to its current parent initially remain in place. This >> way, while dedicated link(s) are being setup with the new, I’ll call it the >> ‘Candidate Parent’, the node and its possible children remain connected and >> reachable. During this period, the node also maintains its rank and time >> synchronization to the current parent, not the candidate parent. Once >> dedicated link(s) are established to the new parent, the node updates its >> rank and time syncs to the new parent. All up stream packets now are routed >> through the new parent and link(s) to the old parent are cleared. >> >> >> >> It has been observed in our system, that the links to the new parent can >> take some time to setup over the single minimal cell. Especially in dense >> networks. This may cause a node to desync or loose connectivity for an >> extended period of time. >> >> >> >> Thank you, >> >> >> >> John Rubis >> >> >> >> _______________________________________________ >> 6tisch mailing list >> 6tisch@ietf.org >> https://www.ietf.org/mailman/listinfo/6tisch >> >> > > > -- > Chang Tengfei, > Pre-Postdoctoral Research Engineer, Inria > > _______________________________________________ > 6tisch mailing list > 6tisch@ietf.org > https://www.ietf.org/mailman/listinfo/6tisch > > -- _______________________________________ Thomas Watteyne, PhD Research Scientist & Innovator, Inria Sr Networking Design Eng, Linear Tech Founder & co-lead, UC Berkeley OpenWSN Co-chair, IETF 6TiSCH www.thomaswatteyne.com _______________________________________
- [6tisch] Question/Comment on draft-chang-6tisch-6… john rubis
- Re: [6tisch] Question/Comment on draft-chang-6tis… Tengfei Chang
- Re: [6tisch] Question/Comment on draft-chang-6tis… Thomas Watteyne
- Re: [6tisch] Question/Comment on draft-chang-6tis… john rubis