Subject: Re: [Isis-wg] doubts

From: Jonathan Sadler <[email-masked]>
Date: Thu, 26 Sep 2002 15:20:18 -0500

Jeff -

Jeff Parker wrote:
> > The biggest probably is the need to support
> > Multi-Level hierarchies with a depth greater
> > than 2.
>
>         While I don't want to start a food fight
> here, can you help me understand why we need
> additional levels?  I have heard people mutter
> things about this for years, but I haven't
> really understood the point yet.

The main rationale has to do with the way that Telecom Service Providers
organize their operations staffs, as well as their networks, and the
size of those networks.  Many operate separate groups that individually
focus on Metro, Regional, National, and International networks. 
Consequently, there is natural summarization in the network designs. 
Couple this with aggregate SONET/SDH node counts of >30,000 (!) nodes
and you can see why they find hierarchy for ASON routing desireable.

Jonathan Sadler
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Thank you.
Tellabs
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