Hi authors, all,

I have a question related to the two-way connectivity check performed on each 
link during the FlexAlgo SPF.

Is this point documented in the document? I could not find it so far.
If not, what is the (reverse connectivity) check that need to be performed on 
the reverse link?

A priori I could see multiple options:
a) link exist
b) link exist with a standard IGP metric  (seem the option defined in the ISO 
spec §7.2.8.2)
c) link exist with the FlexAlgo metric used by FlexAlgo
d) link exist with the FlexAlgo metric used by FlexAlgo and link complies to 
FlexAlgo constraints.

I think we'll agree that this point requires uniformity across nodes hence 
standardization.

Personally, I don't have significant preference, but the algo defined in §13 
"Calculation of Flexible Algorithm Paths" could be read as defining option "d" 
(as links not following the constraints are "pruned from the computation") but 
I'm not sure that this is intended for the two-way connectivity check.

Thanks,
Regards,
--Bruno



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