Leaf-and-Spine Fabric Myths (Part 1)
Apart from the “they have no clue what they’re talking about” observation, Evil CCIE left a long list of leaf-and-spine fabric myths he encountered in the wild in a comment on one of my blog posts. He started with:
Clos fabric (aka Leaf And Spine fabric) is a non-blocking fabric
That was obviously true in the days when Mr. Clos designed the voice switching solution that still bears his name. In the original Clos network every voice call would get a dedicated path across the fabric, and the number of voice calls supported by the fabric equaled the number of alternate end-to-end paths.
Read more ...Cloudera, Hortonworks Merge Their Big Data Efforts
A recent Forrester Research report on the big data fabric space ranked companies as “strong performers."
Kernel of Truth episode 8: Network agility
Podcast: Play in new window | Download
Subscribe to Kernel of Truth on iTunes, Google Play, Spotify, Castbox and Stitcher!
Click here for our previous episode.
On this week’s Kernel of Truth episode, we’re breaking down network agility and why it’s important to you. The networking world loves a good acronym, but have no fear, this episode will also begin to unscramble the alphabet soup that comes with the technology. For this episode we brought in Attilla de Groot and Scott Edwards to discuss why agile networks are changing the tech world, how we got here, and what’s next.
If you’re interested in learning about the virtualization of IT, new innovations, and how that’s helping computing power become greater and faster than ever, this episode is for you. We discuss how Cumulus is making design methods and network architecture that’s easier for our customers to use and how we’re working to design a simpler, more freeing approach to networking and much more. So grab your headphones and sit back for 25 minutes of networking goodness!
Guest Bios
Attilla de Groot: Cumulus Networks; Attilla has spent the last 15 years at the cutting edge of Continue reading
Announcing Firewall Rules
Threat landscapes change every second. As attackers evolve, becoming more dynamic and devious, vulnerabilities materialize faster than engineers can patch their applications. Part of Cloudflare’s mission is to keep you and your applications safe. Today, Cloudflare is launching a new feature, giving customers what they have been requesting - fine-grained control over their incoming requests.
Cloudflare already offers a number of powerful firewall tools such as IP rules, CIDR rules, ASN rules, country rules, HTTP user-agent blocking, Zone Lockdown (for these URIs only allow traffic from those IPs), and our comprehensive managed rules within our WAF (Web Application Firewall). But sometimes, you need to combine the power of these to fully mitigate an attack, and to express a block rule that breaks the boundaries of the existing tools, to be able to “block traffic to this URI when the request comes from that IP and the user-agent matches one of these”.
Flexibility and Control
© Stefano Kocka : Source Wikipedia
Common themes arose when we spoke to customers about their needs and also reviewed feature requests that our customer support team had seen, and we categorised the top pieces of feedback and feature requests into three core needs:
- More flexibility Continue reading
Ryu measurement based control
This article recreates the demonstration using the Ryu SDN framework and emulating a network using Mininet. Install both pieces of software on a Linux server or virtual machine in order to follow this example.
Start Ryu with the simple_switch_13 and ryu.app.ofctl_rest applications loaded:
ryu-manager $RYU_APP/simple_switch_13.py,$RYU_APP/ofctl_rest.pyNote: The simple_switch_13.py and ofctl_rest.py scripts are part of a standard Ryu installation. The $RYU_APP variable has been set to point to the Ryu app directory.
Download sFlow-RT:
wget https://inmon.com/products/sFlow-RT/sflow-rt.tar.gzInstall the Mininet Dashboard application:
tar -xvzf sflow-rt.tar.gz
sflow-rt/get-app.sh sflow-rt mininet-dashboardThe following script, ryu.js, implements the DDoS mitigation function described in the previous article:
var ryu = '127.0.0.1';
var controls = {};
setFlow('udp_reflection',
{keys:'ipdestination,udpsourceport',value:'frames'});
setThreshold('udp_reflection_attack',
{metric:'udp_reflection',value:100,byFlow:true,timeout:2});
setEventHandler(function(evt) {
// don't consider inter-switch links
var link = topologyInterfaceToLink(evt.agent,evt.dataSource);
if(link) return;
// get port information
var port = topologyInterfaceToPort(evt.agent,evt.dataSource);
if(! Continue reading
Dell Technologies Confirms IPO Is Its Backup Plan
Dell said in a filing with the SEC that the company met with investment banks to explore an IPO.
What to Expect: CCIE Routing and Switching Written Exam Bootcamp
Our bootcamps are a great study resource for CCIE candidates. No matter whether you’re just starting out on your CCIE training journey, or have been studying for months, an INE bootcamp can help you gauge where you’re at in the study process and what you need to focus on before attempting your CCIE Exams.
What is a Bootcamp?
Bootcamps are intensive, live classes that typically last from 5-7 days. Bootcamps allow you to dive further into your study path in a small classroom environment with an in-person, expert INE instructor leading the way. Each bootcamp class will cover a specific list of topics tailored to the Cisco track and certification level you are studying. Our instructors will customize the training to focus on certain topics and technologies that best meet the individual requests of the students in your bootcamp.
What’s a Bootcamp Class Actually Like?
In our Written Routing and Switching Bootcamp you will learn about Switching, RIP & EIGRP, OSPF, BGP, MPLS, Redistribution and Evolving Technologies. Our 7 time CCIE, expert-instructor, Rohit Pardasani, will not only help you understand all of the essential R&S topics for this exam, he will also share study techniques and prepare you for Continue reading
Particle Migrates IoT Software Developer Tool to Microsoft
The Workbench product is a desktop development tool that now uses Microsoft Visual Studio Code for direct access to device programming.
San Francisco Giants Save $15K Per Year With Cohesity
The Major League Baseball team wanted to update its antiquated backup platform and utilize cloud storage to further reduce costs.
Episode 36 – State Of IPv6
In this community roundtable episode George Michaelson, Ed Horley, and Leslie Daigle join Network Collective to talk about the current state of IPv6 deployment.
George Michaelson
Guest
Ed Horley
Guest
Leslie Daigle
Guest
Jordan Martin
Host
Russ White
Host
Outro Music:
Danger Storm Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0 License
http://creativecommons.org/licenses/by/3.0/
The post Episode 36 – State Of IPv6 appeared first on Network Collective.
Palo Alto Networks Pays $173M for Cloud Security Startup RedLock
Palo Alto Networks plans to combine technologies from RedLock and Evident, another recent acquisition, into one product that provides cloud security analytics, advanced threat detection, continuous security, and compliance monitoring.
Datanauts 148: What’s New In Azure And Azure Stack – Microsoft Ignite 2018
Chris Wahl and guests dive into the latest announcements about Azure and Azure Stack, including the Data Box storage device, new networking features, and more. This Datanauts episode was recorded live at Microsoft Ignite 2018.
The post Datanauts 148: What’s New In Azure And Azure Stack – Microsoft Ignite 2018 appeared first on Packet Pushers.
6 Ways SD-WAN Simplifies Network Management
SD-WAN offers network management capabilities that can streamline operations while lightening workloads.