Demonstration of the highly reliable HIKARI router network based on a newly developed disjoint path selection scheme

Satoru Okamoto, Eiji Oki, Katsuhiro Shimano, Akio Sahara, Naoaki Yamanaka

Research output: Contribution to journalArticlepeer-review

20 Citations (Scopus)


Integration of multiprotocol label switching functions and multiprotocol lambda switching functions can enhance the throughput of IP networks and remove bottlenecks that are derived from electrical packet processing. To enhance the packet forwarding capability, NTT proposed a photonic MPLS concept that includes MPλS, and demonstrated IP, MPLS, and photonic MPLS integrated router systems called the photonic MPLS router. This router system is now called the HIKARI router. The word HIKARI is Japanese meaning beam, light, lightwave, optical, photonic, and sunshine. The amount of IP data traffic has grown remarkably. Massive IP routers and flexible route control mechanisms are now required to cope with the increased amount of traffic. The HIKARI router can offer two solutions utilizing photonic switching technologies, and photonic network operation and management technologies. The first solution is utilizing photonic switching technologies realized using optical-switch-based crossconnect systems. The other solution is realized using the MPLS and MPλS signaling protocol and photonic network protection functions. In this article we report on the implementation of the HIKARI router systems, propose a newly developed disjoint path selection scheme for generalized MPLS networks with shared risk link group constraints, and demonstrate the signaling protocol and network protection functions. The demonstration system achieves a distributed optical path set-up/tear-down protocol with an extended Constraint-Based Routing Label Distribution Protocol. Fast self-healing through automatic protection switching and a new restoration scheme are also implemented. These functions are successfully implemented, and the performance is verified on a demonstration network. The protection switching scheme achieves protection in less than 20 ms, and the optical path restoration scheme achieves restoration in less than 500 ms.

Original languageEnglish
Pages (from-to)52-59
Number of pages8
JournalIEEE Communications Magazine
Issue number11
Publication statusPublished - 2002 Nov
Externally publishedYes

ASJC Scopus subject areas

  • Computer Science Applications
  • Computer Networks and Communications
  • Electrical and Electronic Engineering


Dive into the research topics of 'Demonstration of the highly reliable HIKARI router network based on a newly developed disjoint path selection scheme'. Together they form a unique fingerprint.

Cite this