Tony -
The problem is that restricting the prefix length does nothing to limit the
number of advertisements that get flooded. In a high-scale situation, when
there is a mass failure, it would lead to a flooding spike. That’s exactly not
the time to stress the system.
[LES:] As I have stated previously, I share your concern about the behavior
during massive events – and some care has to be taken to prevent making a bad
situation worse.
That said, the WG (including you and I) is taking on enhancements to support
much faster flooding – on the order of hundreds (perhaps thousands) of
LSPs/second. We believe this can be done safely (though proof has not yet been
established).
So, if you believe (as your active participation suggests) that IGPs can
support faster flooding – why do you believe they cannot support liveness
notification at a similar scale?
I get that you consider such notifications as architecturally undesirable – we
can agree to disagree on that point.
But I don’t get why you think the IGP’s ability to handle large scale events is
a showstopper in this case.
Les
Yes, it is more complex and harder than simply flooding things. It’s also much
more likely to actually work well at scale and under stress.
It’s pretty common that you can either do things the right way or you can do
things the easy way.
Tony
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