Re: WGLC comments about scoping-arch

>>>>> On Mon, 3 Nov 2003 12:19:44 +0200, 
>>>>> Markku Savela <msa@burp.tkv.asdf.org> said:

>> 4) I'm not sure whether I see the immediate need for the unique subnet
>> multicast scope assignment, as below:
>> 
>> Furthermore, to avoid the need to perform manual configuration in
>> most cases, an implementation should, by default, initially assign
>> zone indices as follows, and only as follows:
>> [...]                                                                              
>> o  A unique subnet (multicast "scop" value 3) index for each
>> interface
>> 
>> ==> this seems mostly like a flawed concept anyway, because you don't really
>> don't have a multicast "subnet" to begin with, because you don't assign
>> multicast addresses on interfaces anyway.  So, I'd consider removing this
>> automatic default and requiring the subnet scope be configured manually.

Hmm, I was not very careful to realize that "subnet-local" scope was
not adopted in RFC3513 (it was in
draft-ietf-ipngwg-addr-arch-v3-10.txt).
draft-ietf-ipv6-addr-arch-v4-00.txt still does not have it.

I don't remember the discussion, if any, on why this concept was
removed from the address architecture, but I agree the concept is not
very clear at best.  I guess the most reasonable way to deal with this
point is to remove the concept of "subnet-local" scope from this
document as well.

I hope this makes sense for everyone.

					JINMEI, Tatuya
					Communication Platform Lab.
					Corporate R&D Center, Toshiba Corp.
					jinmei@isl.rdc.toshiba.co.jp

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