Re: VPLS model for L2VPN Framework document

At 01:39 PM 5/30/2003 +0900, Muneyoshi Suzuki wrote:

>Ali,
>
> > With respect to IEEE, the proper model is single bridge in a PE; however,
> > if Ethernet access network is not used or IEEE control protocols is not
> > used in the MPLS/IP access network, then one can use multiple bridges 
> model
> > where each bridge is simple 1980-style bridge (e.g., VSI). Although the
> > later model is not recommended because of its restrictions.
>
>I'm not sure relation ship between the above and MSTP issue in the
>framework model.

MSTP would apply to the first model - a single bridge within the PE.


>If a Bridged LAN consists of 1980-style bridges that don't support xSTP,
>it is logically equivalent a LAN segment from a viewpoint of Bridges that
>support xSTP, so I think there is no xSTP related issue.

correct.

>I still don't understand the issue in the framework model. I'm still
>waiting answers to the following questions as I posted over two weeks ago.
>
>----
>(1) Could you clarify what the mistake is in the Eric's model, and
>and how your model resolved it?

Frankly I think it was a nit because Eric's wording is general and abstract 
enough that applies to both models. However, in the paragraph after the 
figure, there is a sentence that says:"Within the VPLS-PE, the bridge 
module attaches, through an "Emulated LAN Interface" to an Emulated LAN".
If one considers an emulated LAN as an emulated VLAN, then he can interpret 
this sentence as there is a bridge module for every emulated VLAN (e.g., 
for every VPLS instance) which in turn becomes the multi-bridge model 
within a PE.


>(2) Could you clarify what the right part from "A" means? I my understanding
>it must be a MAC entity or a part of a MAC relay entity that distributed PEs.

I cannot put this question in the proper context.


>(3) Could you clarify why the above model is consistent with the following
>Mick's interpretation of the Bridge protocol architecture.

Hope it is clear now from the above description.

-Ali

>---
>
>Thanks,
>
>
>Muneyoshi Suzuki
>Nippon Telegraph and Telephone Corp.