>Date: Tue, 03 Apr 2001 09:21:22 -0400
>To: Tomohide Nagashima <[EMAIL PROTECTED]>
>From: Margaret Wasserman <[EMAIL PROTECTED]>
>Subject: RE: what is a site?
>Cc: [EMAIL PROTECTED], [EMAIL PROTECTED], [EMAIL PROTECTED],
>[EMAIL PROTECTED], [EMAIL PROTECTED], [EMAIL PROTECTED]
>
>
>I think that this conversation is getting rather far afield...
>
>>With current definition of site, site can inculde site. this is logical
>>matter. Asuume there is one site that has 100 links. If we pick 10 links
>>which are routable each. All node in this network is off-cause routable
>>with site-local address so that network is still site. If we would
>>define Site with only topological matter , site can include site.
>>(but off cause, we would not like to add any other definition for Site.)
>
>All theoretical definitions aside, it is up to the customer, in
>cooperation with the ISP to define what a "site" will be. There
>will be only one "level" of site (no sub-site or full-site)
>because the IPv6 routing architecture does not allow for nested
>sites. This is covered by the restriction that sites cannot
>overlap (sub-sites would completely overlap full-sites).
>
>Given the current definitions in the addressing architecture, we
>can define a "site" to be a group of nodes whose global addresses
>contain the same 48-bit prefix, but this is meaningless. Nodes
>are not allowed to know about the boundaries in the IPv6 addressing
>architecture, and they may change or be eliminated in the future.
>
>More importantly, the practical definition of a site is:
>
>"A group of links between which routers are configured to forward
>packets addressed to or from site-local addresses."
>
>The routers will be explicitly configured by their administrators
>to forward (or not forward) site-local information between any
>two connected links. In most implementations, this will probably
>be accomplished by setting site identifiers to the same value for
>links in the same site. Whenever any router is configured to forward
>site-local packets between two links, those links are in the same
>site. Period.
>
>It is up to administrators to configure their routers with
>consistent prefix information, site identifiers, etc. to produce
>well-formed sites that are "convex" and do not overlap.
>
>Margaret
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