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Ethernet Link Layer Topology Discovery Using Probe Frame

Author: YuYu
Tutor: MengXiaoJing
School: Shandong University of Science and Technology
Course: Applied Computer Technology
Keywords: Data link layer Topology Discovery Probe frames Network simulation
CLC: TP393.02
Type: Master's thesis
Year: 2010
Downloads: 41
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Abstract


This paper studies the Ethernet environment , the data link layer topology discovery problem . In the current study , the most topology discovery is based on the use of SNMP query Ethernet switch topology information . Using the SNMP protocol , however , there are some problems , for example: the low-end switches generally do not support the SNMP protocol . Used herein , the topology discovery algorithm mainly to the network through the host injection probe frames , observe these flows injection probe frames , data link layer Ethernet topology inference . This article used to run the topology discovery algorithm topology discovery simulation software , and the simulation topology discovery algorithm analysis and design, designed and implemented . The main contents and conclusions are as follows: ( 1) First, a brief description of network management functions and architecture . Analysis and design based on the the probe frame of Ethernet data link layer topology discovery algorithm . Summed up hubs, switches and hosts on the Ethernet data link layer behavior . Based on the behavior of these network devices , the design of the segment tree construction algorithm . Departure from the segment tree , combined with the test experiments, the the segment shared switches and edge switches found . Then, by testing and analysis of edge switches , the network gaps decomposition method . Finally, to prove the correctness and completeness of the topology discovery algorithm . (2) design and the topology discovery simulation software . First , switches and other network equipment frame forwarding mechanism . Using object-oriented abstraction and encapsulation technology hubs, switches and host object through the hub , switch and host objects to simulate real network devices , these objects , and the connections between them to establish the data in memory the image of the link-layer network in order to achieve the data link layer network simulation . The simulation data link layer on top of the network , Java script execution probe frame - based topology discovery algorithm . The topology display algorithm is designed and implemented , the results of topology discovery visualization displayed.

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