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Re: [Roll] [roll] #105: trickle-mcast: how to determine scope of MPL domain

Dario Tedeschi <dat@exegin.com> Thu, 15 November 2012 17:59 UTC

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Message-ID: <50A52D91.5000206@exegin.com>
Date: Thu, 15 Nov 2012 09:59:45 -0800
From: Dario Tedeschi <dat@exegin.com>
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To: Michael Richardson <mcr+ietf@sandelman.ca>
References: <058.e817419e990e1afb26be9aa25d5cfc21@trac.tools.ietf.org> <B50D0F163D52B74DA572DD345D5044AF0F6EFA99@xmb-rcd-x04.cisco.com> <50932647.3050509@exegin.com> <B50D0F163D52B74DA572DD345D5044AF0F6F2837@xmb-rcd-x04.cisco.com> <5094202F.4010805@exegin.com> <B50D0F163D52B74DA572DD345D5044AF0F6F874A@xmb-rcd-x04.cisco.com> <509C03C2.50809@exegin.com> <B50D0F163D52B74DA572DD345D5044AF0F714CBF@xmb-rcd-x04.cisco.com> <509C5F00.2050204@exegin.com> <509D5AF5.4040304@exegin.com> <509DAFEF.5020504@exegin.com> <9143.1352758442@sandelman.ca>
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Subject: Re: [Roll] [roll] #105: trickle-mcast: how to determine scope of MPL domain
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On 12/11/2012 2:14 PM, Michael Richardson wrote:
> see inline
>
>>>>>> "Dario" == Dario Tedeschi<dat@exegin.com>  writes:
>      Dario>  Non-link-local would be fine with the following caveats:
>
>      Dario>  1. A non-link-local mc address that *uniquely* identifies the MPL
>      Dario>  domain must exist, whether it be IANA assigned or determined at
>      Dario>  run-time.
>
>      Dario>  2. A packet injected into an MPL domain that has a mc address that does
>      Dario>  not match the MPL domain address must be tunneled.
>
> okay...
> a packet with a link-local mc address does not need tunnelling, because,
> by definition, it can not leave the MPL domain, so it never needs
> tunnelling?
Agreed. I was assuming we were only talking of the forwarding of 
non-link-local multicasts. Of course, link-local scoped packets must not 
be forwarded.


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