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SWITCH Stories

SDxCentral’s Weekly Roundup — February 22, 2019

Published on: 2019-02-21

Here are the week's strays and stragglers we roped for you: Ethernity Networks launched a field-programmable gate array (FPGA)-based virtual private network (VPN) gateway. Splunk withdrew from Russia. The application management company will no longer sell its software and services to companies ...

Attack Campaign Experiments with Rapid Changes in Email Lure Content

Published on: 2019-02-21

It's like polymorphic behavior - only the changes are in the email lures themselves, with randomized changes to headers, subject lines, and body content. A new email Trojan campaign spotted by security researchers has added another twist in evasive attacker behavior: Researchers with GreatHorn ...

T-Mobile to deploy full 5G coverage in The Hague during 2019

Published on: 2019-02-21

The Dutch telco said the deployment of this technology will allow the city to deploy several smart city initiatives The Hague is set to become the first Dutch city to receive full 5G coverage, as local carrier T-Mobile announced plans to start the roll out the technology this year.

Why Cybersecurity Burnout Is Real (and What to Do About It)

Published on: 2019-02-21

The constant stresses from advanced malware to zero-day vulnerabilities can easily turn into employee overload with potentially dangerous consequences. Here's how to turn down the pressure. Cybersecurity is one of the only IT roles where there are people actively trying to ruin your day, 24/7. ...

Wi-Fi 6, 5G play big in Cisco’s mobile forecast

Published on: 2019-02-19

The popularity of mobile devices will continue its dramatic growth over the next four years as new technologies kick in with higher density and bandwidth, according to Cisco's annual Global Mobile Data Traffic Forecast Update (2017 - 2022) released this week.

Why I’m excited for Apple’s Wi-Fi 6 iPhones

Published on: 2019-02-19

Don't fret too much when Apple fails to introduce a 5G iPhone this year, it's not terribly important that it does. Wi-Fi 6, on the other hand... The latest edition of Cisco's Mobile Visual Networking Index (VNI) Forecast (2017 - 2022) makes several predictions around 5G.

Cisco pushes silicon photonics for enterprise, webscale networking

Published on: 2019-02-08

Cisco says it's closed its deal to buy optical-semiconductor firm Luxtera for $660 million bringing it the advanced optical technology customers will need for speed and throughput for future data-center and webscale networks.

What is hyperconvergence?

Published on: 2019-02-07

Hyperconvergence is an IT framework that combines storage, computing and networking into a single system in an effort to reduce data center complexity and increase scalability. Hyperconverged platforms include a hypervisor for virtualized computing, software-defined storage, and virtualized ...

Time to rise to the synchronization challenges of 5G

Published on: 2019-02-01

2019 is set to be the year of 5G when the next-generation network technology finally arrives and changes the face of the mobile world. But for operators to make a success of 5G deployments, they need to prepare their transport and synchronization ...

There’s a newly acknowledged Edge local IP networking bug in Win10

Published on: 2019-01-18

If you can't get to your router's admin page using the Edge browser, there's a reason why. Microsoft broke it with this month's cumulative updates. Yesterday, Microsoft appended this warning to all of its Windows 10 January cumulative update pages for version 1703 onward: After installing [this ...

2019: Look for improvements to software-defined data-center networks

Published on: 2018-12-10

To help IT pros attain top performance for their software-defined data-center networks (SDDCN), we have identified 10 crucial technology areas to watch and evaluate during 2019. SDDCN performance requires advanced network software to provision, manage and secure high-speed traffic flows, and ...

How to buy SD-WAN technology: Key questions to consider when selecting a supplier

Published on: 2018-12-03

Software-defined WAN traffic is exploding, and so is the number of technology providers competing for enterprise SD-WAN customers. Here are some key issues to consider as IT pros investigate SD-WAN deployment options and weigh the importance of features such as application prioritization, ...

Aruba Wireless Controllers: Architecture & Configurations

Published on: 2019-02-21

A little bit of training, some researching, and a lot of time on the GUI is what I found to be the recipe in getting comfortable with Aruba Wireless Controllers. Even though I spent more time configuring the controllers via GUI, knowing the syntaxes I now find it much simpler to do it via the CLI.

Move to DNA or ACI?

Published on: 2019-02-21

Relationship of Cisco ONE to DNA and ACI Digital business relies upon a new digital network, in enterprise networking and the data center. This new network requires a software-based and policy-driven approach, automation, built-in security, proactive monitoring and troubleshooting.

EoS and EoL Announcement for the Cisco 819, 881, 887, 896, 897 and 899 4G LTE Routers

Published on: 2019-02-19

Cisco has announced the end-of-sale and end-of-life dates for the Cisco 819, 881, 887, 896, 897 and 899 4G LTE Routers. The last day to order the affected product(s) is July 29, 2019. Customers with active service contracts will continue to receive support from the Cisco Technical Assistance ...

Cisco 900 Series Integrated Services Routers-Ordering Information

Published on: 2019-02-18

The Cisco 900 Series Integrated Services Routers (ISRs) combine Internet access, comprehensive security, and wireless services in a single high-performance device that is easy to deploy and manage. Cisco 900 Series ISRs are well suited for deployment as Customer Premises Equipment (CPE) in ...

Cisco 900 Series ISRs-Chassis Views, Power Supply and Specs

Published on: 2019-02-15

In this article, we'd like to describe the views of Chassis, LED Indicators, Power Supply, and Specs of Cisco 900 Series ISR. This section contains front and back panel views of the Cisco 900 Series ISR-showing locations of the power and signal interfaces, interface slots, status indicators, and ...

The Cisco 900 Series ISR Migration

Published on: 2019-02-14

Cisco launched a new SOHO router-the 900 Series ISRs. What is the Cisco ISR 900 series used for? Find the Right ISR 900 Model The Cisco 900 Series ISR Migration The more important is Cisco ISR 900 series models will replace the most Cisco 800 Series ISRs.

Dealing with Performance Brownouts

Published on: 2019-02-07

I've done a couple of application slowness (brownout) troubleshooting sessions recently. This blog is my attempt to condense some observations from both engagements, to share lessons learned. "Condense" might not be the right word, seeing how long this blog got! Troubleshooting with some process ...

A Damn Handy Catalyst Switch Command

Published on: 2019-02-01

When it comes to working with Cisco's Catalyst switches, there are a handful of commands that get used pretty frequently to tell what's going on. I'm talking about after configuration is done, and when you come back to a switch later on for whatever reason to troubleshoot or verify operational ...

A Discussion On Storage Overhead

Published on: 2019-01-28

Let's talk about transmission overhead. For various types of communications protocols, ranging from Ethernet to Fibre Channel to SATA to PCIe, there's typically additional bits that are transmitted to help with error correction, error detection, and/or clock sync. These additional bits eat up ...

Fibre Channel Login

Published on: 2019-01-26

There are three login processes to happen before the initiator can communicate to the target. The initiator will need to register itself to the fabric (FLOGI), then once registered, it needs to create a session to the target (PLOGI) and then exchange the required parameter both supports for ...

Postman Collection for vRealize Network Insight APIs

Published on: 2019-01-24

When developing automation and using APIs, Postman is a very welcome tool. I use it to test out API calls and to make sure I format the calls correctly, before translating it to the code of whatever I'm working on.

Just Say No to Jumbo Frames

Published on: 2019-01-24

How do you feel about jumbo MTU? I seem to periodically get into debates about jumbos. I'm highly allergic to jumbos. Let's examine the facts (as I see them), and then we'll get to the cause of my allergic reaction. TL;DR: jumbo can cause major operational pain for network administrators.

Ways to Automate VXLAN

Published on: 2019-01-10

More and more sites are deploying Cisco Nexus 9K-based fabrics. Basically, if the time has come for datacenter switch refresh, you have two choices: Nexus 7700 etc. with a "classic Nexus" design (core, distribution, Top of Rack, FEX), or Nexus 9K-based fabrics. Fabrics are cool and look like a ...

YANG, OpenAPI, Swagger and Code Generation

Published on: 2018-10-23

Sometimes during exploration or projects, I want to take a YANG model and convert it along with related dependencies to a Swagger format (think OpenAPI if you're not familiar with this) so I can create a REST or RESTConf API interface.

The Changing Cisco QoS Environment

Published on: 2019-01-03

A few months ago, I wrote about the tradeoffs between using a L3 switch and a router. That blog noted that there are a lot more QoS capabilities on the Cisco routers. L3 switches provide a much more constrained set of QoS features, presumably those suitable for high speed processing in chips.

Hype in the Pipe- Wear Your Butthole Smoke Guards Going Into 2019

Published on: 2018-12-31

Lest ye allow smoke to be blown up yer kilt, don ye reality filter agin' the vapors o' San Jose. - Old Scottish Proverb These are exciting times to be in the business of networking. Whether the topic is wired, enterprise wireless, cellular or WAN, it's all getting faster, bigger, and more complex.

My Home Automation Gear

Published on: 2018-12-30

I've mostly kept this blog around virtualization technology. Over the last few months, I've had more and more conversations about home automation and how my house is tricked out. A lot of people seem to be interested in my setup, so I'm going to start sharing more on the gear, workflows & results.

GORUCK Land Navigation Heavy - East AAR

Published on: 2018-12-20

In June my son and I completed our first GORUCK Heavy event, the Land Nav on the west coast in Southern California. You can read the AAR here. It wasn't but a few weeks later that the coordinator of the event started to plan a similar event for the east coast and the location was identified as ...

PlexxiPulse – Plexxi HCN™, The Most Powerful Software-Defined Network, Now Available On Dell

Published on: 2018-02-23

This week, we announced support for Dell Networking Z9100-ON and Dell Networking S4048-ON data center fabric switches. Plexxi HCN™ will give Dell customers the power to scale data center networks flat and cost-effectively while still delivering unrestricted performance for all application ...

Innovation or Iteration

Published on: 2018-02-16

The word "innovation" gets thrown around a lot these days. I wouldn't blame anyone if the word now evokes a gag reflex similar to how we all eventually reacted to "cloud" a few years back. Every product and presentation seemed to be reworked to make it appear it was a "cloud" product.

Juniper RADIUS-delivered switching filters

Published on: 2018-11-06

I've been experimenting with getting RADIUS to deploy switching filters to Juniper switches recently, as part of a reference architecture demo. The concept is called REACH2020 and combines network virtualisation with the ability to identify network users and devices so that categories of user ...

Installing Moloch on Debian 9 Stretch

Published on: 2018-10-31

A tutorial explaining how to install Moloch, Elasticsearch and Java on Debian 9 Stretch.

Intent-Based Network Automation with Ansible

Published on: 2017-09-06

The latest in all the networking buzz these days is Intent-Based Networking (IBN). There are varying definitions of what IBN is and is not. Does IBN mean you need to deploy networking solely from business policy, does IBN mean you must be streaming telemetry from every network device in ...

Cisco Smart Install Remote Code Execution

Published on: 2018-04-05

At the end of March, Cisco published a stack-based buffer overflow vulnerability in Smart Install Client code. This vulnerability enables an attacker to remotely execute arbitrary code without authentication. So it allows getting full control over a vulnerable network equipment. Cisco Smart ...

RedNectar’s Hyperflex Pre-Install Checklist (Updated)

Published on: 2018-10-06

Completing Cisco's Pre-installation Checklist for Cisco HX Data Platform will capture all the information you need, but not necessarily in the order you need it, and for a single site only. So, I decided to write a version that gets the information in the order you need it and in a format that's ...

Meraki's LittleTable Isn't So Little Anymore #MFD3

Published on: 2018-09-26

Way, way back in 2013, I attended Wireless Field Day 4 and I heard a presentation by Sean Rhea of Meraki about their backend database LittleTable, how it was developed, how it worked and how it grew. A few highlights of Sean's presentation covered the server redundancy with data-center ...

App-V: Office 365 Pro Plus and SAP EPM COM Add-in loading issue

Published on: 2018-09-04

In the past months the preparation for Windows 10 image, core applications and App-V software packages has been done. The client migrations are now ongoing where several issues have pop-up during the switch from Windows 7 to Windows 10. New Office 365 Pro Plus installation is there and the need ...

Attacking Wireshark

Published on: 2018-09-03

Every once in a while there is some news about Wireshark being vulnerable to being attacked/exploited/pwned, meaning that there is a way to craft frames/packets in a pcap/pcapng file to make Wireshark crash and (if done right) execute malicious code. So let's take a look at what that means and ...

Wireshark Column Setup Deepdive

Published on: 2018-08-21

Every once in a while I check the blog statistics for the searches that have brought visitors here. Most of them are more or less concealed versions of "how can I grab the password of others/my ex partner/my children/friends", which comes as no surprise.

Resolution Immediacy and Deployment Immediacy – ACI Master Class

Published on: 2018-08-17

When configuring ACI, have you ever wondered what those Resolution Immediacy options [ Immediate | On Demand | Pre-provision] and the Deployment Immediacy options [ Immediate | On Demand] do? Read on to find out. I always like to start with a picture.

Nyansa Voyance at NFD18

Published on: 2018-08-16

Disclaimer : I was lucky enough to have been invited to attend Network Field Day 18 this past July in Silicon Valley. This event brings independent thought leaders to a number of IT product vendors to share information and opinions.

Cisco OpFlex

Published on: 2018-06-12

Cisco ACI uses OpFlex to communicate with VMWare DVS/VDS. OpFlex is an extensible policy protocol designed to exchange abstract policy between a network controller and a set of smart devices capable of rendering policy. OpFlex relies on a separate information model understood by agents in both ...

An Update for my Adoring Fans

Published on: 2018-06-05

I feel like a teenage girl with a fashion blog who hasn't posted in 6 months and comes back with "I know I haven't posted in a while..." Sigh. It's been right at a year since I actually published a post, so I figured I would give everyone an update.

The Overlay Problem: Getting In and Out

Published on: 2016-09-30

I've been researching overlay network strategies recently. There are plenty of competing implementations available, employing various encapsulations and control plane designs. But every design I've encountered seems ultimately hampered by the same issue: scalability at the edge. Why Build an ...

Storm control on a QFX VCF

Published on: 2017-12-15

There don't seem to be many operational commands in Junos to tell you what's going on with regard to Storm Control. Here's all I could find - let me know if you know of more: In the lab, I configured this storm control profile: {master:1} user@VCF> show configuration forwarding-options ...

L3 fabric DC -The underlay Network (BGP) -part2

Published on: 2017-01-17

In the previous post, we laid the foundation of L3 fabric DC In this post we will discuss the underlay network which mainly provide IP reachability plus ECMP capability, here BGP would play a role in your DC next to the 3 other that we discussed one of the previous posts.

L3 fabric DC -The underlay Network -Part1

Published on: 2016-12-07

In the previous posts we have discussed the classic DC designs and the M-LAG solution. In this post we will cover the basic L3 fabric DC, you might never heard of it or you think that's a solution for massive scale DC, yes the massive DC in the world would be running L3 fabric but nowadays more ...

Classic DC and M-LAG

Published on: 2016-08-29

In the pervious post we talked about BGP in Data Center and how it is a topic of discussion in between the DC and the SP arenas. In this post I will start explaining some classic DC design and laying its shortage which will engage the SP gurus with us, as well it will make sure ...

It's Dirty Work, But Somebody's Gotta Do It

Published on: 2015-02-14

Network Engineers are known to have to work in dirty places like under desks, janitors closets (err I mean network closets), and those weird spaces in mechanical rooms in which someone decided to hide a switch or two.

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