Re: [Lsr] WG Last Call fo "IS-IS Flood Reflection" -draft-ietf-lsr-isis-flood-reflection-05

[Aijun Wang <[e-mail]>]

Hi, Tony:

I am referring to the “flood reflection” solution.
I think “area proxy” is one better solution if we want actually the L1 zone to be the transited by L2 zone.

Aijun Wang
China Telecom

> On Dec 10, 2021, at 13:13, Tony Li <[e-mail]> wrote:
> 
> 
> 
> Hi Aijun,
> 
>> No, I think the WG participations would like to enjoy the interested and correct direction topics. 
>> One technical considerations is the following: if IGP evolved into this direction, then the following connections loop diagram is also possible:
>> L2-L1-L2-L1-L2-L1-…..-L2(back to the origin)
>> Then, will we introduce the “AS number” to avoid loop, and various “Path Attributes” to influence the path selection within the IGP?
> 
> 
> I think you misunderstand how Area Proxy works.
> 
> In fact, the L1 area actually is running L1L2, so there is no need for additional loop detection mechanisms.  Within the L2 LSDB, the area’s topology
> is simply abstracted away and only the interconnections with L2 systems are visible. The area effectively looks like a single node.
> 
> Tony
>