Re: [Bier] Questions on draft-eckert-bier-te-arch-01

Caitlin Bestler <caitlin.bestler@nexenta.com> Mon, 12 October 2015 20:45 UTC

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To: Antoni Przygienda <antoni.przygienda@ericsson.com>, Eric C Rosen <erosen@juniper.net>, "bier@ietf.org" <bier@ietf.org>
References: <55DF5BAD.9060003@juniper.net> <20151007221035.GA26709@cisco.com> <20151009022602.GA32419@cisco.com> <5617EA57.4040909@nexenta.com> <2E4BB27CAB87BF43B4207C0E55860F180EAE0D74@eusaamb103.ericsson.se> <56181A58.4070500@nexenta.com> <561C072E.9050305@juniper.net> <2E4BB27CAB87BF43B4207C0E55860F180EAE2235@eusaamb103.ericsson.se>
From: Caitlin Bestler <caitlin.bestler@nexenta.com>
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Date: Mon, 12 Oct 2015 13:45:53 -0700
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Subject: Re: [Bier] Questions on draft-eckert-bier-te-arch-01
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On 10/12/15 1:38 PM, Antoni Przygienda wrote:
>   [Tony saiz:]  I would whole-heartedly agree here. Sub-domains are really here to
> separate bigger-grain concepts like services or different router sets running BIER,
> think source/destination ports in a sense.
> Orthogonally, SI gives a transparent solution to the fact that we can't realistically
> carry 32KB receiver bitmasks in each packet, in a sense equivalent to IP
> fragmentation solving  the problem of limited media MTU.
>
> --- tony

The issue is that you are complicating the user interface to BIER for 
the benefit
of an implementation detail that you are not describing in the 
architecture, and
I believe is officially not-in-scope.

Would it be appropriate to add language to the effect that each Sub-Domain
SHOULD/MAY map to a different routing underlay?

>