Clik here to view.
Cisco adds sFlow support
Cisco Nexus 3000 series switchesCisco added support for the sFlow standard in the latest NX-OS 5.0(3)U4(1) release for Nexus 3000 series switches. The Nexus 3000 series are the first Cisco switches...
View ArticleConfiguring ZyXEL switches
The following commands configure a ZyXEL switch, sampling packets at 1-in-1024, polling counters every 30 seconds and sending sFlow to an analyzer (10.0.0.50) over UDP using the default sFlow port...
View ArticleClik here to view.
GPU performance monitoring
NVIDIA's Compute Unified Device Architecture (CUDA™) dramatically increases computing performance by harnessing the power of the graphics processing unit (GPU). Recently, NVIDIA published the sFlow...
View ArticleConfiguring IBM RackSwitch switches
The following commands configure an IBM RackSwitch, sampling packets at 1-in-1024, polling counters every 30 seconds and sending sFlow to an analyzer (10.0.0.50) over UDP using the default sFlow port...
View ArticleClik here to view.
Vendor support
Cisco's recent support for the sFlow standard should come as no surprise. The graph trends the rapid growth in vendor support for sFlow over the last decade. Today, in addition to Cisco, virtually...
View ArticleClik here to view.
Snowflakes, IPFIX, NetFlow and sFlow
Snow flakes by Wilson BentleyEach snowflake is unique and beautiful. However, while such immense diversity is attractive in nature, variation in data center management standards results in operational...
View ArticleConfiguring AlaxalA switches
The following commands configure an AlaxalA switch, sampling at 1-in-1024, polling counters every 30 seconds and sending sFlow to an analyzer (10.0.0.50) over UDP using the default sFlow port (6343):...
View ArticleClik here to view.
Host sFlow progress
The open source Host sFlow project has made significant progress over the last two years. The rapidly increasing number of downloads reflects the projects maturity and the unique functionality...
View ArticleConfiguring Hitachi switches
The following commands configure a Hitachi switch, sampling at 1-in-1024, polling counters every 30 seconds and sending sFlow to an analyzers (10.0.0.50) over UDP using the default sFlow port (6343):...
View ArticleClik here to view.
Packets and Flows
Figure 1: Sending a picture over a packet switched networkFigure 1 illustrates how data is transferred over a packet switched network. Host A is in the process of transferring a picture to Host B. The...
View ArticleClik here to view.
Switch configurations
A large number of articles describing the steps to configure sFlow traffic monitoring have been published on this blog over the last few years. This article compiles a set of links in order to make the...
View ArticleClik here to view.
Link aggregation
Figure 1: Link Aggregation GroupsThe title of the recently finalized sFlow LAG Counters Structure specification may not sound like much, but it is an exciting development for managing data center...
View ArticleClik here to view.
Thread pools
Figure 1:Thread poolThe thread pool pattern, illustrated in figure 1, is common to many parallel processing applications. A number of worker threads, organized in a thread pool, take tasks from a task...
View ArticleClik here to view.
sFlowTrend adds web server monitoring
This chart was generated using the free sFlowTrend application to monitor an Apache web server using the sFlow standard. The chart shows a real-time, minute by minute view of Top URIs by Operations/s...
View ArticleClik here to view.
Using Ganglia to monitor GPU performance
The Ganglia charts show GPU health and performance metrics collected using sFlow, see GPU performance monitoring. The combination of Ganglia and sFlow provides a highly scaleable solution for...
View ArticleClik here to view.
Finding elephants
The Blind Men and the ElephantJohn Godfrey Saxe (1816-1887)It was six men of IndostanTo learning much inclined,Who went to see the Elephant(Though all of them were blind),That each by observationMight...
View ArticleClik here to view.
Performance aware software defined networking
Figure 1: Performance aware SDN applications with sFlow-RTThe article, Software defined networking, described reasons for including the sFlow standard as the visibility protocol in an SDN stack....
View ArticleClik here to view.
SDN and delay
Figure 1: Components of delay in a feedback control systemDelay and stability, describes the critical importance of low latency in building stable and effective feedback control systems. The article...
View ArticleClik here to view.
Rapidly detecting large flows, sFlow vs. NetFlow/IPFIX
Figure 1: Low latency software defined networking control loopThe articles SDN and delay and Delay and stability describe the critical importance of low measurement delay in constructing stable and...
View ArticleClik here to view.
Load balancing LAG/ECMP groups
Figure 1: Hash collision on a link aggregation groupThe Internet Draft, draft-krishnan-opsawg-large-flow-load-balancing, is a good example of the type of problem that can be addressed using performance...
View Article