Re: [OSPF] OSPF Topology Transparent Zone (TTZ) WG Poll for Adoption as Experimental

I support it for adoption as "Experimental" as a co-author.

This draft specifies a method for topology abstraction, virtualization and reduction. An implementation has been completed and shown as running codes in IETF'91 at Hololulu. 

Among others I see a few testable advantages and up-sides:

- It can reduce message amount and topology complexity, and thus reduces the OSPF computation overhead for routers out of the zones. 

- It allows for network re-areaing without service disruption. Sometimes a network needs to be split into multiple smaller areas. Without TTZ, we would see that some interfaces will go down after the old area is removed and then go up after the new area is configured. With TTZ, the routers would not "feel" those changes inside a zone.

- It provides for operational ease for network re-areaing. Splitting a part of network into few smaller areas is very challenging. TTZ will make the job a lot easier.

- It improves network scalability a lot by virtualizing a zone as its edges connected, and can make Create and Maintain E2E Service much easier.

Thanks and regards,

Renwei

-----Original Message-----
From: OSPF [mailto:ospf-bounces@ietf.org] On Behalf Of Acee Lindem (acee)
Sent: Saturday, January 10, 2015 1:09 PM
To: OSPF WG List
Subject: [OSPF] OSPF Topology Transparent Zone (TTZ) WG Poll for Adoption as Experimental

We have discussed OSPF TTZ at several IETFs and the authors and their colleagues have even developed a working prototype. We believe there is consensus that the protocol mechanisms are viable. However, there is disagreement as to whether or not these mechanisms will provide significant benefit. The answer is definitely topology and deployment dependent. After some discussion, we have decided to poll for adoption as an experimental draft. Please indicate your support or opposition WG adoption as experimental prior to January 24th, 2015.

For your convenience, here is a URL for the draft:

http://www.ietf.org/id/draft-chen-ospf-ttz-09.txt

Thanks,
Acee and Abhay 

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