• Author : jp

 
 

Achieving Optimal Timestamp Accuracy on 7150 Platforms

Background The launch of the Arista 7150S in 2012 delivered the industry’s first product to offer high speed networking with high granularity packet time stamping in an Ethernet switch/router platform. This article will review how time stamping has evolved since. Arista first conceived of the capability to leverage the 7150S to intersect with an emerging network monitoring market requirement that would improve the ability to capture the proper order of traffic captured by network analysis tools over the out of band (OOB) tap aggregation (aka network packet broker) infrastructure. Applying timestamps to packets at the network ingress ports of the...
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Common challenges with TAP aggregation

Introduction Capturing raw network packet data, whether it be from a mirror port or through an aggregation infrastructure, is often perceived to be a complex task. In reality, most of the anomalies or limitations faced by those starting out with capture have simple explanations and are usually not due to problems with the source devices but instead the capturing tool. This article provides a brief of commonly reported issues and some suggested avenues of investigation. Timestamping Timestamps missing or corrupt Check timestamping is configured correctly to match the hosts’ expectations (i.e. is the host looking in the right place for...
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Introduction to TAP aggregation

Introduction Traditional approaches to network monitoring rely on the ongoing collection of generic, high level statistics such as interface utilization from a selection of network devices to detect trends or anomalies in service availability. Such metrics are naturally limited in the level of granularity they can provide and often only provide a hint of real underlying network conditions without providing any visibility into per-application activity or performance. Traditionally, reactive and localized packet capture would be employed to determine the cause of the performance degradation.  However the manual nature of needing to configure packet capture and mirroring and then physically attach...
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Leveraging Deep Inspection and Traffic Steering for monitoring SIP environments

Introduction With the expansion of SIP (Session Initiation Protocol) and RTP (Real-time Transport Protocol) for IP based telephony applications, enterprises and carriers alike have a requirement to track and capture calls or parts of calls for the purposes of performance analysis and forensic/legal monitoring requirements. This post documents a powerful use for Deep Inspection and Traffic Steering features to deliver a highly scaleable yet cost effective solution for stateful load-sharing of monitored VoIP services, avoiding the need for proprietary hardware (such as FPGA based accelerator modules). As the volumes of calls grow, it is clear that traffic will need to...
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