Why no dead gateway detection for Multipath routes?

Hi,

Why doesn't linux do dead gateway detection for multipath routes? To be more 
specific, why isn't something like fib_detect_death() called inside 
fib_select_multipath(), whereas it is called in fib_select_default()?

Isn't this a violation of the MUST part of section 3.3.1.4 of RFC 1122?

3.3.1.4 Dead Gateway Detection

The IP layer MUST be able to detect the failure of a "next- hop" gateway 
that is listed in its route cache and to choose an alternate gateway (see 
Section 3.3.1.5).

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