[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: A philosophical question about FA and FA-LSP

hi kireeti,

My question was what is (if any) special about FA TE link apart from
the fact that it is dynamically created/destroyed?



Actually, an FA TE link doesn't have to be dynamically
created/destroyed.

What's special?  Nothing really.  A "normal" TE link usually has a
(single) physical interface associated with it; an FA TE link is
usually multi-hop.  A "normal" TE link usually is accompanied by an
IGP adjacency (at least, in the packet domain); an FA TE link usually
doesn't.

but if a couple this with your answer "Correct -- LSPs created in IGP A can be advertised as TE links in IGP B. This can be used (say) for inter-area signaling." don't you have now an adjacency accompanying the TE link advertisement in IGP B - therefore why is there a need to rename the canonical inheritance i.e. why not just speak in that case about a TE link or a "hierarchical TE link" as it was the case in one of the earlier versions of the LSP-HIER document and keep the FA concept when dealing with a unique instance ?

thanks,
- dimitri

But from the point of view of the IGP, or an LSR in that IGP, they
can't tell an FA TE link from any other TE link.
> 
Kireeti.
-------


.