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

[Tony Li <[e-mail]>]

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