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Path Key ID
Ingress
Egress
PCE
A
D
C
B
PCE
Full explicit paths with cooperating PCEs. Diversity, but no secrecy.
Selected entry points Loose hop to destination. Secrecy, but no diversity.
Path Key ID
Path Key ID. Secrecy and diversity. Path key lookup on entry to second domain.
Pushed Path Key. Removes setup delay at expense of stored information.
PPT Version