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Why? Node 2 Node1 PW (Important traffic) PW (Best effort) Tunnel-1 (BW1) Tunnel-2 (BW2), backup Tunnel-1 Switch-over Conventional mechanism would work, if Tunnel-1 and Tunnel-2 have the same bandwidth (i.e.,BW1 = BW2) All PW’s are equally important Otherwise, if BW2 < BW1, in case of Tunnel-1 failure, Important traffic may get dropped by Best Effort So, it needs to provide per-PW protection Each PW needs to have its own “importance” level During switch-over, preempt others when necessary How to assign “importance” level? |