This paper reviews recent work on routing optimization for interior gateway protocols, and identifies important areas where further research is needed. Recently, a new approach to the routing optimization has been identified, which has proven to be of significant relevance to companies that have adopted it. This approach is based on the optimization of link weights with different function that may affect shortest path selection, traffic distribution and finally network routing cost into a single optimization model. The problem of simultaneously considering the characteristics and requirements of different functions to perform an overall optimization has attracted the attention of researchers in recent years and some models have been proposed in this direction.

1. D. Awduche, A. Chiu, A. Elwalid, I. Widjaja, and X. Xiao, "Overview and principles of Internet traffic engineering," IETF, RFC 3272, May 2002.
2. D. Katz, D. Yeung, and K. Kompella, "Traffic engineering extensions to OSPF. " Work in progress,Internet Draft draft-katz-yeung-ospf-traffic-06. txt, Expires April 2002.
3. Anton Riedl, Member, IEEE, and Dominic A. Schupke, Member, IEEE" Routing Optimization in IP Networks Utilizing Additive and Concave Link Metrics" IEEE/ACM TRANSACTIONS ON NETWORKING, VOL. 15, NO. 5, OCTOBER 2007
4. A. Zinin, Cisco IP Routing. Boston, MA: Addison-Wesley, 2002.
5. E. C. Rosen, A. Viswanathan, and R. Callon, "Multiprotocol label switching architecture," Network Working Group, Internet Draft (work in progress), http://search. ietf. org/internet-drafts/draftietf- mpls-arch-05. txt, 1999.
6. Nor Musliza Mustafa, Mohamed Othman "A Review of Routing Optimization Using OSPF", Proceedings of the 2007 IEEE International Conference on Telecommunications and Malaysia International Conference on Communications, 14-17 May 2007, Penang, Malaysia
7. X. Xiao, A. Hannan, B. Bailey, L. Ni, "Traffic Engineering with MPLS in the Internet", IEEE Network magazine, Mar. 2000.

Network (as) rip Is-is