Hi all,

As part of the discussions during the OSPF WG meeting, the following comes imho 
as the bottomline of the discussion for what concerns TTZ: what is the 
potential gain  

  i) when TTZ is used as "replacement of" existing OSPF techniques (thus 
compared to multi-area/ABR)

  ii) when TTZ is used "in complement to" OSPF techniques (thus in addition to)

The answer should help determining whether current multi-area/ABR is "too heavy 
for what it brings" vs there is a "third routing level" required in OSPF to 
sustain large deployments. 

In the latter case, assuming that multi-area/ABR is still appropriate, the next 
question would be: is it more suited to look at different mechanism or re-use 
as much as possible the existing one e.g. "sub-ABR" ?

Opinions ? Comments ?

Thanks,
-dimitri.
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