On Friday, July 27, 2001 @7:55 AM Abbie Barbir wrote:
here is some extra remarks on the
A Model for Open Pluggable Edge Services draft
please read between the text
From: Penno, Reinaldo [SC9:T327:EXCH]
Sent: Thursday, July 26, 2001 10:41 PM
To: 'Michael W. Condry'; 'ietf-openproxy(_at_)imc(_dot_)org'
Subject: RE: draft-tomlinson-opes-model-00.txt
First IMO the draft it too biased on "Content Networks". OPES
can provide "Content Services" to any network that provide
content to the user.
yes, i agree with reinaldo, OPES exists independent of CDI
Agreed. Please see 7/31/01 reply to Reinaldo.
HERE I MADE ADD,
The concept of edge services as an overlay is ok, however, the
way that is presented in the draft is too restrictive for the
- it assumes that each overlay is independent with a seperate
------ here, we can extend the concept of an edge services overlay
to broder range, there is no restriction for several access providers
or ISPs to cooporate such that their edge services become an extended
overlay (an overlay of overlays).
The intent was not to limit an overlay in this manner. The "authoritative
domain" is a logical construct in which an Edge Service Network is
to act in behalf of the party it is representing (client or origin server).
may be the case that it is in its own administrative domain and has
authority to represent many clients or servers and thus can be a member of
multiple authoritative domains concurrently.
- the overlays can also be combined, basically, a content overlay can
be defined that provide content to one or more edge services overlays
(or from above a virtual edge services overlay that is composed of
various edge services overlays).
- the same can be said about client overlays. (here, an overlay can
be defined that allow clients to roam across various edge services
in fact, the edge services overlay model can be used as an alternative
to the cdi peering model, in this case, the content provider(s) can be
though off as having their own overlay(s). the edge services as another
overlay and the clients as an overlay.
for an OPES intermeiary (surrogate) to act on behalf of a content source,
it has to subscribe to the content overlay (similar analogy can be used
about surrogates or caches).
I don't see the alternative to CDI here. Edge Service Networks rely upon
content networks, they don't obviate them. I see the parallelism with
CDI of multiple OPES networks working in behalf of a content sources.
we can discuss the analogy further if there is interest
hope the above helps
Thanks for the comments