Re: [Roll] trickle-mcast-04 - Clarify scope value of 3 - subnet-local

Michael Richardson <mcr+ietf@sandelman.ca> Mon, 15 July 2013 16:43 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: Mon, 15 Jul 2013 12:42:21 -0400
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Subject: Re: [Roll] trickle-mcast-04 - Clarify scope value of 3 - subnet-local
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Ralph Droms (rdroms) <rdroms@cisco.com> wrote:
    >>> The most recent rev of draft-droms-6man-multicast-scopes defines
    >>> scope 0x03 as:
    >>
    >>> 3 Network-Specific scope, greater than Link-Local scope, defined
    >>> automatically from the network topology
    >>
    >>> To be confirmed: will this definition suffice for MPL?
    >>
    >> I think it is sufficient, because we understand what it means.  I am
    >> concerned about the word "Network"... which could mean anything to
    >> anyone.
    >>
    >> I'd think that the right word would be "subnet", because the intent is
    >> that it is for the entire /64 or whatever it is that one is using.  I
    >> think that is the term that is used in RFC4291.

    > "subnet" implies that this multicast scope must derive from the address
    > assignment topology.  The first (and only) use case is derived from the
    > /64 prefix; do we want to have that limitation for all uses of scope
    > 0x03?

I think so.
--
]               Never tell me the odds!                 | ipv6 mesh networks [
]   Michael Richardson, Sandelman Software Works        | network architect  [
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Michael Richardson <mcr+IETF@sandelman.ca>, Sandelman Software Works