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Re: [Roll] multicast in unaware-leaves

"Pascal Thubert (pthubert)" <pthubert@cisco.com> Tue, 09 July 2019 10:07 UTC

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From: "Pascal Thubert (pthubert)" <pthubert@cisco.com>
To: "Li Zhao (liz3)" <liz3@cisco.com>, "draft-ietf-roll-unaware-leaves@ietf.org" <draft-ietf-roll-unaware-leaves@ietf.org>
CC: Routing Over Low power and Lossy networks <roll@ietf.org>
Thread-Topic: multicast in unaware-leaves
Thread-Index: AQHVNjNXlfxFW3XNtU+NsE/nsIg/8abCDQ3A
Date: Tue, 09 Jul 2019 10:06:48 +0000
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Subject: Re: [Roll] multicast in unaware-leaves
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Hello Li:

These are good suggestions. This is  also extending the role of the document from RPL only to MPL as well.



Ø  RUL should not be a MPL forwarder

Though it has dependencies on them, this spec does not mandate anything on RULs, it is only on routers.  So we could say that the spec does not expect the RUL to understand MPL and to forward it. Now if it does, it does not hurt does it?


Ø  MPL Hop-by-Hop Header can be ignored when not understood

MPL option type cannot be ignored. It is 6D and the first two bits indicate that the IPv6 node must discard the packet if it doesn't recognize the option type. This is why https://tools.ietf.org/html/draft-ietf-roll-useofrplinfo changes the RPL option from x63 to x23. So the HbH must be encapsulated and removed.


Ø  6LR might decapsulate MPL’s IP-in-IP packet and forward to RUL

Yes, no choice there I guess.

All the best,

Pascal

From: Li Zhao (liz3) <liz3@cisco.com>
Sent: mardi 9 juillet 2019 10:50
To: draft-ietf-roll-unaware-leaves@ietf.org
Cc: Routing Over Low power and Lossy networks <roll@ietf.org>
Subject: multicast in unaware-leaves

Hello Pascal,

I have a comment about multicast protocol in draft-ietf-roll-unaware-leaves-02:

Section 8 explains Protocol Operations for Multicast Addresses and lists Registration flow of MLDv2.
RFC7731 MPL is also a popular Multicast Protocol for Low-Power and Lossy Networks.

Is it possible to add any description for MPL? Such as:

  *   RUL should not be a MPL forwarder
  *   MPL Hop-by-Hop Header can be ignored when not understood
  *   6LR might decapsulate MPL’s IP-in-IP packet and forward to RUL


Best regards,
Li

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