SRLG / Affinity bits

R1----R2-----R3
              ------R4

Simple topology but say R2 routes to R3/R4 over the same DWDM fibre then R2 would have IGP peering's to both R3/R4

Now if the fibre gets cut in the ocean somewhere then the RSVP messages would inform the headend (R1) that it can no longer reserve the control-plane bandwidth & besides IGP is broken from R2 to R3/R4

I know in tests I did with CSPF the explicit static path did not want to go down the SLRG / where I set the affinity bits when it was the only choice left I.e in this case peering's were up but RSVP messages did not propagate the explicit path, so my question in that case what is the real benefit of setting these options into TE extensions when I experienced the above?

IGP/RSVP would know things are broken right?

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BR
Tony
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