Re: [CCAMP] I-D Action: draft-ietf-ccamp-wson-signal-compatibility-ospf-06.txt

[Julien Meuric <[e-mail]>]

Hi.

On this issue of layout ambiguities, I do expect from the /Common 
Control.../ WG to provide a strong level of commonalties in protocols.

Beyond common object encodings, common object packing into LSAs is also 
significant. The first impact is on the operational tools used to 
supervise and analyze protocol exchanges: the more strict the OSPF 
packing rules are, the more usable and efficient those tools will be. 
Furthermore, troubleshooting will be easier and people training always 
benefit from commonalties.

Not to mention the lack of benefits from operational experience if, 
because of layout discrepancies between OSPF implementations, two 
GMPLS-controlled sub-networks, with similar node designs, end up by 
requiring, for instance, different entities to identify, or very 
different dimensioning of signaling networks...

My 2 cents,

Julien


Le 04/10/2011 18:00, PELOSO, PIERRE (PIERRE) a écrit :
> Besides this point, my originating concern was to avoid ambiguities.
> In the case of the Link LSA, there is no ambiguity, whatever the CP implementation the LSA will be similar to describe the same link.
> Possibly, one implementation can be less verbous than an other by omitting some of the optional sub-TLVs, but there will be no differences in the structure.
> And currently the WG drafts allow multiple TLVs layouts, that will conduct to different LSA structures for different CP implementation, and even worse, a CP implementation may itself follow different rules depending on the node structure.
> These differences can come for example from the capability provided today of defining Resource Block Information that describe a group of similar devices or a single device.
> I am afraid these lack of consistency in the design of TLV are putting at risks, CP restarts and implementation interops.
> My opinion is that we could avoid these confusions, by defining some LSA design rules.
>
> Then, I wished we could work together in providing more details to current section 3 of the draft.