Re: [Roll] enrollment priority
Michael Richardson <mcr+ietf@sandelman.ca> Fri, 10 April 2020 21:44 UTC
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From: Michael Richardson <mcr+ietf@sandelman.ca>
To: Routing Over Low power and Lossy networks <roll@ietf.org>
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Date: Fri, 10 Apr 2020 17:44:11 -0400
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Subject: Re: [Roll] enrollment priority
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Rahul Jadhav <rahul.ietf@gmail.com> wrote: > The draft should make it clear that the min-priority can only be > reduced or kept the same (i.e., the min-priority absolute value can > only increase, thus reducing priority) going downstream in the > sub-DODAG. For e.g., if a 6LR sets the min-priority to 10, the > downstream 6LRs can only set the value >= 10 in their min-priority. I will add, to section 2: > Consider the following scenario (the attached image will help explain): > Node C's preferred parent is node B and alt parent is node A. What > happens if the min-priority of node B changes to 127 after the node C > has joined the network with B as a preferred parent? I am assuming > that the min-priority impacts only the newly joining nodes i.e., once > node B changes the priority to 127 then node C also changes the > priority to 127 and thus no new nodes join. However, the change in > node B's min-priority may not impact node C's decision to continue > using node B as the preferred parent (?). What happens when node C has > alternate parent node A whose priority is lesser than 127. Should node > C switch to node A so as to allow new downstream nodes to join the > network? First, I think that if node C had a MP of 127, then it would *NOT* advertise itself as a Join Proxy. So if it was sending Enhanced Beacons, then it would: a) set proxy prio to 0x7f. b) maybe even stop sending EBs [have to think about this] c) not accept any unencrypted traffic! so yeah, node D would be out of luck. If node C *does* change to node A, then it would change it's priority. But it has to do that, and maybe there are reasons why A won't accept it. > I don't believe there would be backward compatibility issues with this > new option, but the draft can clarify this explicitly. I have added: This document uses the extensions mechanism designed into {{!RFC6550}}. It does not need any mechanism to enable it. 6LRs that support this option, but whose parent does not send it SHOULD assume a value of 0x40 as their base value. The nodes adjust this base value based upon their observed congestion, emitting their adjusted DIO value to their children. (0x40 is my wet-finger-in-the-air, seat-of-the-pants guess) > We tried working on a problem-statement in the past in LWIG [1] which > talked about how to handle the case where some upstream nodes cache > (routing/neighbor) is full and how would it stop the new downstream > nodes to attach in that path. Enrollment priority was referenced as a > possible solution. Good. Would more informative cross-references help? Do you want to co-author? -- ] Never tell me the odds! | ipv6 mesh networks [ ] Michael Richardson, Sandelman Software Works | IoT architect [ ] mcr@sandelman.ca http://www.sandelman.ca/ | ruby on rails [ -- Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works -= IPv6 IoT consulting =-
- [Roll] enrollment priority Rahul Jadhav
- Re: [Roll] enrollment priority Michael Richardson
- Re: [Roll] enrollment priority Rahul Jadhav
- Re: [Roll] enrollment priority Michael Richardson
- Re: [Roll] enrollment priority Michael Richardson