LLMP： Exploiting LLDP for Latency Measurement in Software-Defined Data Center Networks  

作　　者：Yang Li Zhi-Ping Cai Hong Xu 

机构地区：[1]College of Computer, National University of Defense Technology, Changsha 410073, China [2]Department of Computer Science, City University of Hong Kong, Hong Kong 9990V7, China

出　　处：《Journal of Computer Science & Technology》2018年第2期277-285,共9页计算机科学技术学报（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China under Grant Nos. 61379145, 61501482, 61762033.

摘　　要：The administrators of data center networks have to continually monitor path latency to detect network anomaly quickly and ensure the efficient operation of the networks. In this work, we propose Link Layer Measurement Protocol （LLMP）, a prototype latency measuring framework based on the Link Layer Discovery Protocol （LLDP）. LLDP is utilized by the controller to discover network topology dynamically. We insert timestamps into the optional LLDPTLV field in LLDP, so that the controller can estimate latency on any single link. The framework utilizes a reactive measurement approach without injecting any probe packets to the network. Our experiments show that the latency of a link can be measured accurately by LLMP. In relatively complex network conditions, LLMP can still maintain a high accuracy. We store the LLMP measurement results into a latency matrix, which can be used to infer the path latency.The administrators of data center networks have to continually monitor path latency to detect network anomaly quickly and ensure the efficient operation of the networks. In this work, we propose Link Layer Measurement Protocol （LLMP）, a prototype latency measuring framework based on the Link Layer Discovery Protocol （LLDP）. LLDP is utilized by the controller to discover network topology dynamically. We insert timestamps into the optional LLDPTLV field in LLDP, so that the controller can estimate latency on any single link. The framework utilizes a reactive measurement approach without injecting any probe packets to the network. Our experiments show that the latency of a link can be measured accurately by LLMP. In relatively complex network conditions, LLMP can still maintain a high accuracy. We store the LLMP measurement results into a latency matrix, which can be used to infer the path latency.

关 键 词：software-defined network （SDN） Link Layer Discovery Protocol （LLDP） latency measurement 

分 类 号：TP393.4[自动化与计算机技术—计算机应用技术] O157.5[自动化与计算机技术—计算机科学与技术]