On Scalable Service Function Chaining with O(1) Flowtable Entries

Yi Ren, Tzu Ming Huang, Ching-Ju Lin, Yu-Chee Tseng

研究成果: Conference contribution同行評審

8 引文 斯高帕斯(Scopus)


The emergence of Network Function Virtualization (NFV) enables flexible and agile service function chaining in a Software Defined Network (SDN). While this virtualization technology efficiently offers customization capability, it however comes with a cost of consuming precious TCAM resources. Due to this, the number of service chains that an SDN can support is limited by the flowtable size of a switch. To break this limitation, this paper presents CRT-Chain, a service chain forwarding protocol that requires only constant flowtable entries, regardless of the number of service chain requests. The core of CRT-Chain is an encoding mechanism that leverages Chinese Remainder Theorem (CRT) to compress the forwarding information into small labels. A switch does not need to insert forwarding rules for every service chain request, but only needs to conduct very simple modular arithmetic to extract the forwarding rules directly from CRT-Chain's labels attached in the header. We further incorporate prime reuse and path segmentation in CRT-Chain to reduce the header size and, hence, save bandwidth consumption. Our evaluation results show that, when a chain consists of no more than 5 functions, CRT-Chain actually generates a header smaller than the legacy 32-bit header defined in IETF. By enabling prime reuse and segmentation, CRT-Chain further reduces the total signaling overhead to a level lower than the conventional scheme, showing that CRT-Chain not only enables scalable flowtable-free chaining but also improves network efficiency.

主出版物標題INFOCOM 2018 - IEEE Conference on Computer Communications
發行者Institute of Electrical and Electronics Engineers Inc.
出版狀態Published - 11 10月 2018
事件2018 IEEE Conference on Computer Communications, INFOCOM 2018 - Honolulu, United States
持續時間: 15 4月 201819 4月 2018


名字Proceedings - IEEE INFOCOM


Conference2018 IEEE Conference on Computer Communications, INFOCOM 2018
國家/地區United States


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