LazyCtrl: scalable network control for cloud data centers

Kai Zheng, Lin Wang, Baohua Yang, Yi Sun, Yue Zhang, Steve Uhlig

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contributionpeer-review

7 Citations (Scopus)


The advent of software defined networking enables flexible, reliable and feature-rich control planes for data center networks. However, the tight coupling of centralized control and complete visibility leads to a wide range of issues among which scalability has risen to prominence. We observe that data center traffic is usually highly skewed and thus edge switches can be grouped according to traffic locality. As a result, the workload of the central controller could be highly reduced if we carry out distributed control inside those groups. Based on the above observation, we present LazyCtrl, a novel hybrid control plane design for data center networks. LazyCtrl aims at bringing laziness to the central controller by dynamically devolving most of the control tasks to independent switch groups to process frequent intra-group events using distributed control mechanisms, while handling rare inter-group or other specified events by the controller. We implement LazyCtrl and build a prototype based on Open vSwich and Floodlight. Trace-driven experiments on our prototype show that an effective switch grouping is easy to maintain in multi-tenant clouds and the central controller can be significantly shielded by staying lazy, with its workload reduced by up to 82%.

Original languageEnglish
Title of host publicationProceedings - 2015 IEEE 35th International Conference on Distributed Computing Systems
Subtitle of host publicationICDCS 2015
Place of PublicationPiscataway, NJ
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Number of pages2
ISBN (Electronic)9781467372145
ISBN (Print)9781467372152
Publication statusPublished - 22 Jul 2015
Externally publishedYes
Event35th IEEE International Conference on Distributed Computing Systems, ICDCS 2015 - Columbus, United States
Duration: 29 Jun 20152 Jul 2015


Other35th IEEE International Conference on Distributed Computing Systems, ICDCS 2015
Country/TerritoryUnited States


Dive into the research topics of 'LazyCtrl: scalable network control for cloud data centers'. Together they form a unique fingerprint.

Cite this