/127 between routers?

[Mark Smith]

On Thu, 14 Jan 2010 10:56:08 +0000
Sam Wilson <Sam.Wilson at ed.ac.uk> wrote:

> 
> On 14 Jan 2010, at 08:37, Mark Smith wrote:
> 
> > ... Of the 3 versions of the IPv6 Addressing
> > Architecture RFCs (1884, 3513 and 4291), the 64 bit Interface ID
> > requirement was specified in RFC3513, published in April 2003, so it's
> > been part of the IPv6 addressing model for nearly 7 years.
> 
> And it is stated as a requirement without invoking RFC 2119  
> language.  My first thought is that it is difficult to know what  
> force the authors intended that requirement to have.
> 

It would have been better if they used RFC2119 terms. However, when the
English word "required" is used , it means "not optional". Other words
like "suggested", "optionally", "recommended" etc. would have been used
if a 64 bit interface ID wasn't required.

> 
> Sam Wilson
> Network Team, IT Infrastructure
> Information Services, The University of Edinburgh
> Edinburgh, Scotland, UK
> 
> 
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> The University of Edinburgh is a charitable body, registered in
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>