Aijun,

*> or lose the fast convergences*

Putting aside all the drawbacks already discussed, what makes you think
that flooding LSPs or LSAs across tens of hops over 2 or maybe soon 8 areas
would be any faster then sending BGP UPDATE message(s) across 2-3 RRs ?

Assume you need to detect the failure and react to it in your RP/RE
regardless how it is signalled. If triggered by ABRs you not only need to
detect the failure of a node, but also flood it locally within the local
area.

Light propagation speed last time I checked does not seems to be different
for BGP vs OSPF/ISIS packets.

Thx,
R.
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