Dataplane Based Fast Failover in SDN-Enabled Wide Area Measurement System of Smart Grid
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In the wide area measurement system (WAMS) of
smart grid, the real-time monitoring and protection applications
have stringent requirements for the end-to-end transmission
delays between PMUs and PDC, and fast failover is required to
ensure the communication performance after link failures. In this
work, the software-defined network (SDN) technology is utilized
to enable datapath failover upon a link failure with a global view
of the communication network. Then, a novel dataplane based
fast failover (DFF) mechanism is proposed to directly re-route
the data packet in dataplane without interacting with the SDN
controller. Based on the mathematical analysis over the WAMS
topology features, the proposed DFF optimizes two procedures of
failover: backup path construction, and backup path installation.
Using the proposed backup path construction algorithms, the
3-approximate and (1+2")-approximate (0 < " < 1) backup
paths can be constructed, theoretically guaranteeing the data
transmission delays both during and after failover. Using the
proposed LinkID-based FF group table installation method, the
conflict of forwarding rules between original and backup paths
can be eliminated, while the storage cost is also optimized. The
simulation results on six IEEE benchmark test power systems
show that the proposed DFF mechanism could achieve lower
data transmission delays during and after failover compared to
the existing control plane based and dataplane based failover
mechanisms.
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http://purl.org/coar/resource_type/c_6501 http://purl.org/coar/version/c_970fb48d4fbd8a85
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en