Does FabricPath relies only on IS-IS hello exchange to detect link failures or does it implement BFD (Bidirectional Forwarding Detection)?

I'm trying to understand if FabricPath relies only on IS-IS hello exchange to detect link failures or if it implements BFD (Bidirectional Forwarding Detection) to reduce the failure detection time. I noticed n RFC to introduce BFD in TRILL signed by a person from Cisco, so I was wondering if they adopted that in FP.
Thanks.

So.. it doesn't wait for a certain time after which if no hellos are received the link is considered down. It react as soon as a port down notification is received... right?
So what if aggregated links are used? How does it behave?

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