> > Some read it (many):
  > > 
  > >  "if I configure a site here, I must also block site-locals 
  > > from spreading 
  > > out or false site-locals coming in"
  > > 
  > > Some others read it:
  > > 
  > >  "if I use site-locals here, my upstream router will block 
  > > the site-local 
  > > addresses from spreading out and prevent anyone from spoofing 
  > > site-locals 
  > > to my site"
  > > 
  > > The latter is how I read it must be implemented -- and 
  > > reading Microsoft's implementation and the reason they're 
  > > using SL *strongly* suggests they 
  > > also have read it that way.  There are very probably many others.
  > 
  > No, I think you're the only person reading it the latter way.

=> Agreed. I haven't seen anyone else interpret it this way.

Hesham

  > 
  > My expectation is that routers will need to be configured 
  > to understand
  > site boundaries. A conservative position is that routers by default
  > should regard their interfaces as belonging to different 
  > sites, unless
  > they are configured to be in the same site. Or perhaps 
  > other aspects of
  > the router's configuration (eg the network prefixes assigned to
  > different interfaces, or the routing protocols in use) 
  > could be used to
  > default the site configuration.
  > 
  > Rich
  > 
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