The layered architecture of modern communication networks takes advantage of the flexibility of upper layer technology, such as IP, and the high data rates of lower layer technology, such as WDM. In particular, the WDM technology available today can support up to several terabits per second over a single fiber , making networks vulnerable to failures, because a failure for even a short period of time can result in a huge loss of data. The main theme of network survivability is to prevent such data loss by provisioning spare resources for recovery. In this chapter, we focus on the impact of layering on network survivability.
This work was supported by NSF grants CNS-0626781 and CNS-0830961 and by DTRA grants HDTRA1-07-1-0004 and HDTRA-09-1-0050. Hyang-Won Lee was supported in part by the Basic Science Research Program through the National Research Foundation of Korea(NRF) funded by the Ministry of Education, Science and Technology (2012R1A1A1012610).
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