Cisco nsf or IETF nsf ?

I am confused about this scenario,


Assume a topology like this




r1 and r2 running isis and ospf on same link between them,ospf is configured for cisco nsf and assume isis is configured for ietf

nsf,which nsf is used between them ?


I heard from a TAC engineer that only one of the NSF can be active between routers,but he wasn't sure which one is prefered over other.


so just want to know it for knowledge purpose,can any one clarify it ?


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