[j-nsp] Prioritize/guarantee bandwidth

[The Drifter]

Router A has a link to routerB
  RouterB has a link to RouterC
  RouterB has a link to RouterD
 
All traffic originates from RouterA
 
A----------B---------C
                  ---------D
 
At the time of traffic conjestion on link A-B. Can I configure a rsvp LSP from A-to-D with Bandwidth reservation to allow traffic bound, A to routerD, to take precedence?
 
Many Thanks
Jim
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