M. Bearden et al., "Assessing network readiness for IP telephony," in to appear in IEEE Int'l Conf. on Communications (ICC' Home/Search Document Details and Download
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SNMP-based Layer-3 Path Discovery - David Stott Avaya (2002) (Correct)
....Abstract This paper presents a process for discovering the layer 3 path between two endpoints in a computer network using information available through SNMP in commonly used MIB objects. The path information is useful for analyzing computer networks (e.g. as needed for Avaya Inc. s ExamiNet [1]) The output of the process is similar to the common traceroute tool, with a few important differences. First, it uses information available via SNMP from the routers. Second, it does not generate traffic on the network after collecting the initial MIB tables. Third, it does not rely on any ....
....available via SNMP. In many cases, knowing the layer 3 topology can aid in network analysis. In particular, when end to end applications report poor performance between a pair of endpoints, the topology is critical for hot spot detection and root cause analysis. For example, the analysis in [1] collects end to end performance information and uses the path to identify the MIB interface index (ifIndex) of each interface along the path to help identify any problem in the routers along the path. The path is also useful in diagnosing mis configured routes. A common tool for finding the ....
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M. Bearden et al., "Assessing network readiness for IP telephony," in to appear in IEEE Int'l Conf. on Communications (ICC'
Layer-2 Path Discovery Using Spanning Tree MIBs - Stott (2002) (Correct)
....IP telephony readiness in customer networks, and has been run on an example enterprise network. 1 Introduction Knowledge of network topology including the path between endpoints, can play an important role in analyzing, engineering, and visualizing network performance. For example, ExamiNet [1] collects performance variables from routing devices and end to end application measurements and needs the topology to identify which performance variables applly to interfaces on the path. This paper describes an algorithm for finding layer 2 paths using SNMP to collect information about ....
....interfaces in the path between two switches, followed by the interface connected to the destination endpoint. 4.1 Data Collection Phase Identify switches and routers: The first step is to identify the switches and routers in the network. This step is handled by the ExamiNet discovery module [1]. The module scans a network by sending SNMP probe messages to every IP in a given range and collecting the responses from the network. Next, the module uses a heuristic to classify each device that responded to the probe as a router, switch, host, etc. based on the system OID or various MIB ....
M. Bearden et al., "Assessing network readiness for IP telephony," in to appear in IEEE Int'l Conf. on Communications (ICC'2002.
Experiences with Evaluating Network QoS for IP Telephony - Bearden, Denby, Karacal, .. (2002) (2 citations) Self-citation (Bearden Denby Karacali Meloche Stott) (Correct)
....collected data from 23 hosts over a period of two weeks. The findings of our experiment identified links in the network that were over utilized to the point at which they could not handle IP Telephony. In this experiment, we used our prototype tool, ExamiNet , for data collection and analysis [3]. ExamiNet automatically discovers the network using Simple Network Management Protocol (SNMP) queries and builds the topology. After the completion of discovery, it injects synthetic voice traffic to the network, emulating full duplex voice calls. ExamiNet collects end to end QoS ....
....of links as a pipe if each link in the sequence carries the same synthesized call traffic. We refer to the number of links on a pipe as the length of the pipe. Note that a sequence of pipes form a path. Figure 2 shows a small Note that this definition is slightly different than the one in [3]. A D 3 D L 2 3 D 1 D 2 L 1 L 4 L 5 L Figure 2. Pipes network and its reduction to pipes. In the figure A, B, and C are the endpoints and the pipes are marked along the links. Links and form the pipe since both links carry the same synthesized call traffic. Note that a ....
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M. Bearden, L. Denby, B. Karacali, J. Meloche, and D. T. Stott. "Assessing Network Readiness for IP Telephony,". To Appear in the Proc. of the 2002.
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