What is the characteristic of the Tl-LFA?

TI-LFA provides loop-free alternate paths for specific prefixes and links within an instance, but the term 'super backbone' is not a standard OSPF construct, and it does not universally guarantee a loop-free path for 'all interfaces' across an entire backbone in that manner.

TI-LFA applies per routing protocol instance, not specifically 'on each area and instance' in a way that suggests separate area-level configuration beyond the instance's scope.

While TI-LFA aims to provide loop-free alternate paths for routes within an OSPF domain, stating it guarantees a loop-free path for 'all areas' is too broad and potentially misleading; its scope is for specific failure scenarios and depends on the topology supporting an LFA.

TI-LFA is a configuration applied at the OSPF (or IS-IS) routing protocol instance level, meaning that once configured on the instance, all interfaces belonging to that instance automatically inherit the TI-LFA protection configuration for quick path recovery without per-interface configuration.