Abstract
Survivability
against disasters—both natural and deliberate attacks, and spanning
large geographical areas—is becoming a major challenge in communication
networks. Cloud services delivered by datacenter networks yield new opportunities
to provide protection against disasters. Cloud services require a network
substrate with high capacity, low latency, high availability, and low cost,
which can be delivered by optical networks. In such networks, path protection
against network failures is generally ensured by providing a backup path to
the same destination (i.e., a datacenter), which is link-disjoint to the primary
path. This protection fails to protect against disasters covering an area
which disrupts both primary and backup paths. Also, protection against destination
(datacenter) node failure is not ensured by a generic protection scheme. Moreover,
content/service protection is a fundamental problem in a datacenter network,
as the failure of a datacenter should not cause the disappearance of a specific
content/service from the network. So content placement, routing, and protection
of paths and content should be addressed together. In this work, we propose
an integrated Integer Linear Program (ILP) to design an optical datacenter
network, which solves the above-mentioned problems simultaneously. We show
that our disaster protection scheme exploiting anycasting provides more protection,
but uses less capacity than dedicated single-link failure protection. We show
that a reasonable number of datacenters and selective content replicas with
intelligent network design can provide survivability to disasters while supporting
user demands. We also propose ILP relaxations
and heuristics to solve the problem for large networks.
© 2012 IEEE
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