SDN and NFV Era
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It can be challenging to obtain optimal bin packing without significant network disruption and/or bandwidth over-booking when RSVP-TE LSPs are reserving bandwidth in a network in a PCE controlled network. A complex and involved process of make-before-break(MBB) LSP creation and LSP preemption is needed to optimize an existing network.  Using Northstar's Zero-Bandwidth mode enables a PCE to route LSPs without considering the reservation style of the network or that a LSP set-up maybe rejected due to BW overbooking when a MBB operation is performed. This allows the PCE to optimize resource utilization more effectively and more aggressively thereby achieving greater network efficiency.





Juniper Networks Technical Books