Re: [Roll] WG Last Call draft-ietf-roll-trickle-mcast-02
peter van der Stok <stokcons@xs4all.nl> Thu, 25 October 2012 11:28 UTC
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Date: Thu, 25 Oct 2012 13:27:56 +0200
From: peter van der Stok <stokcons@xs4all.nl>
To: roll@ietf.org, jonathan hui <jonhui@cisco.com>, richard kelsey <richard.kelsey@silabs.com>
Organization: vanderstok consultancy
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Subject: Re: [Roll] WG Last Call draft-ietf-roll-trickle-mcast-02
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Dear Richard and Jonathan, We are quite happy with this new draft but I should like to comment on two aspects which need improvement according to me. (next to my earlier remark about implementation of MC domain) Multicast message encapsulation: For our applications it is important that the MC control message fits into one link-layer frame. Simulations show that with fragmented 6LoWPAN packets the MPL behavior becomes quite unpredictable unless specific measures are taken in all transmitting nodes. Knowing that the payload of a MPL packet is around 60 bytes, and may be further reduced by security overhead (see draft-keoh-tls-multicast-security-00), every byte of payload counts. Therefore I suggest that the original MC message can be distributed inside the LLN network without the encapsulation by the MPL message. I can very well imagine that encapsulation is needed to send the message to the seed (from inside the LLN network or from outside), but once it reaches the seed within the LLN, transmission of the original MC message inside the LLN is recommended without the encapsulation but including the MPL option in the header of the original MC packet. The MPL-2 draft suggests that when the MPL domain is composed of multiple MPL link-local scopes (even when contained within the LLN) each MPL forwarder encapsulates and decapsulates. I suggest that the wording is changed such that this is not necessary as long as the MC packet travels within the LLN. Forwarder behavior: The draft describes that sending of ICMP messages can be suppressed by setting REACTIVE_TIMER_EXPIRATIONS to zero. I like to suggest the same possibility for PROACTIVE_TIMER_EXPIRATIONS. The motivation is the following: In rather dense networks, it would be beneficial to reduce the number of forwarders. However, the non-forwarders may not receive some messages in spite of the density. By allowing these nodes to use the sending of ICMP messages, the forwarding nodes can be informed of the missing message to trigger a retransmission Peter van der Stok JP Vasseur (jvasseur) schreef op 2012-10-25 08:55: > Dear all, > > draft-ietf-roll-trickle-mcast-02 has been discussed on the mailing > list and during WG meeting a number of time; the document is stable > and > has been implemented. Thus this starts a 2-week WG Last call ending > on Nov 9 at noon ET. Please send your comments to the authors > and copy the mailing list and the co-chairs. > > Thanks. > > JP. > > _______________________________________________ > Roll mailing list > Roll@ietf.org > https://www.ietf.org/mailman/listinfo/roll
- [Roll] WG Last Call draft-ietf-roll-trickle-mcast… JP Vasseur (jvasseur)
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… peter van der Stok
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Thomas Heide Clausen
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Ulrich Herberg
- [Roll] Fwd: Re: WG Last Call draft-ietf-roll-tric… peter van der Stok
- Re: [Roll] Fwd: Re: WG Last Call draft-ietf-roll-… Don Sturek
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Ulrich Herberg
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Don Sturek
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Ulrich Herberg
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Don Sturek
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Dario Tedeschi
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… peter van der Stok
- Re: [Roll] Fwd: Re: WG Last Call draft-ietf-roll-… peter van der Stok
- Re: [Roll] Fwd: Re: WG Last Call draft-ietf-roll-… Don Sturek
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Jonathan Hui (johui)
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Jonathan Hui (johui)
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Don Sturek
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Ulrich Herberg
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… peter van der Stok
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Jonathan Hui (johui)
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… peter van der Stok
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Jonathan Hui (johui)
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Robert Cragie
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Dario Tedeschi
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Jonathan Hui (johui)
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Robert Cragie
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Dijk, Esko
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Robert Cragie
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… peter van der Stok
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Don Sturek
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Don Sturek
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… peter van der Stok
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Michael Richardson
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… peter van der Stok
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Jonathan Hui (johui)
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Robert Cragie
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Dario Tedeschi
- [Roll] END of WG LC -- Re: WG Last Call draft-iet… JP Vasseur (jvasseur)
- Re: [Roll] END of WG LC -- Re: WG Last Call draft… Thomas Clausen
- [Roll] WG Last Call draft-ietf-roll-trickle-mcast… JP Vasseur (jvasseur)
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… peter van der Stok
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Kerry Lynn
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Don Sturek
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Kerry Lynn
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… David Culler
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Don Sturek
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Don Sturek
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… JP Vasseur (jvasseur)
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… peter van der Stok
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Don Sturek
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… peter van der Stok
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Don Sturek
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Ralph Droms
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Ralph Droms
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Philip Levis
- Re: [Roll] WG Last Call draft-ietf-roll-trickle-m… Abdussalam Baryun