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Journal of Optical Communications and Networking

Journal of Optical Communications and Networking

  • Editor: Richard A. Linke
  • Vol. 2, Iss. 3 — Mar. 3, 2003
  • pp: 69–82

IP-oriented control of unidirectional-path-switched-ring–based transport networks

Vishal Sharma, Abhimanyu Das, and Charles Chen  »View Author Affiliations


Journal of Optical Networking, Vol. 2, Issue 3, pp. 69-82 (2003)


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Abstract

An important requirement in the IP-based control of time-division multiplexing (TDM) optical transport networks is to utilize the in-built protection capabilities of synchronous optical network (SONET) unidirectional path-switched rings (UPSRs) and to automate the UPSR-protected path setup in mixed mesh–ring networks. This requires modifications to existing IP signaling and routing protocols and new processing rules at the network nodes. Here we leverage IP routing and signaling and multiprotocol label switching (MPLS) fast-reroute techniques for accurately advertising UPSR ring topologies to remote nodes and dynamically establishing UPSR-protected paths across a transport network. Our proposal also makes a NUT1-like (nonpreemptible unprotected traffic) feature possible in UPSRs, which allows for efficient utilization of UPSR protection bandwidth. We achieve this by encoding UPSR-specific information in the open shortest-path-first (OSPF) link state advertisements and in signaling messages of the Resource Reservation Protocol (RSVP) with TE extensions. In addition, we modify the signaling and routing state machines at the nodes to interpret and process this information to perform UPSR topology discovery and path computation. The uniqueness of our proposals is that the algorithms and the rules specified here allow for existing IP-based protocols [such as those within the generalized MPLS (GMPLS) framework, which currently applies to mesh networks] to be efficiently adapted for this context while still achieving our objective of exploiting UPSR-protection capabilities.

© 2002 Optical Society of America

OCIS Codes
(060.0060) Fiber optics and optical communications : Fiber optics and optical communications
(060.4250) Fiber optics and optical communications : Networks

ToC Category:
RESEARCH PAPERS

History
Original Manuscript: October 7, 2002
Revised Manuscript: October 7, 2002
Published: February 24, 2003

Citation
Vishal Sharma, Abhimanyu Das, and Charles Chen, "IP-oriented control of unidirectional-path-switched-ring–based transport networks," J. Opt. Netw. 2, 69-82 (2003)
http://www.opticsinfobase.org/jocn/abstract.cfm?URI=jon-2-3-69


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References

  1. GR-1400-CORE, “SONET dual-fed unidirectional path switched ring (UPSR) equipment generic criteria,” Issue 2 (Bellcore, January 1999), <a href="http://www.telcordia.com/">http://www.telcordia.com/</a>.
  2. GR-1230-CORE, “SONET bi-directional line switched ring (BLSR) equipment generic criteria,” Issue 4 (Bellcore, December 1998), <a href="http://www.telcordia.com/">http://www.telcordia.com</a>.
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  13. Nonpreemptible unprotected traffic, a feature commonly offered in more expensive and more complex 2F and 4F BLSR systems.
  14. P. Pan, D. H. Gan, G. Swallow, J. P. Vasseur, D. Cooper, A. Atlas, and M. Jork, “Fast reroute extensions to RSVP-TE for LSP tunnels”, Work in Progress, draft-ietf-mpls-rsvp-lsp-fastreroute-01.txt (Internet Engineering Task Force, November 2002), <a href="http://www.ietf.org/internet-drafts/draft-ietf-mpls-rsvp-lsp-fastreroute-01.txt">http://www.ietf.org/internet-drafts/draft-ietf-mpls-rsvp-lsp-fastreroute-01.txt</a> .
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  16. We define a focal node on a UPSR ring to be a node that either originates or terminates a TDM LSP (or TDM channel/circuit) or one that sits at the intersection of two or more UPSR rings.

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