MPLS ConceptsPenultimate Hop Popping

1

Router C

2

Router B

• The label at the top of the stack is removed (popped) by the upstream neighbour of the egress LSR

• The egress LSR requests the “popping” through advertising implicit-null label via the label distribution protocol

• One lookup is saved - the egress LSR will not have to lookup and remove the label itself

192.89.10/24

Previous slide

Next slide

Back to first slide

View graphic version