History Of Networking – Fred Baker – QoS & DS Bit

In this, the very first History Of Networking episode of Network Collective, Fred Baker joins us to talk about his involvement with Quality of Service and the Differentiated Services model. Fred Baker has been involved with the IETF since 1989, served as IETF chair between 1996 and 2001, and has done much work to establish standards in the data networking industry.

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 History Of Networking – Fred Baker – QoS & DS Bit appeared first on Network Collective.

History Of Networking – Fred Baker – QoS & DS Bit

In this, the very first History Of Networking episode of Network Collective, Fred Baker joins us to talk about his involvement with Quality of Service and the Differentiated Services model. Fred Baker has been involved with the IETF since 1989, served as IETF chair between 1996 and 2001, and has done much work to establish standards in the data networking industry.

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 History Of Networking – Fred Baker – QoS & DS Bit appeared first on Network Collective.

Datanauts 095: Exploring Azure IaaS with Jennelle Crothers

IDG Contributor Network: Do you have an IT trade craft skills gap?

Do you have, or does your data infrastructure environment have a tradecraft skills gap?Keep in mind that tradecraft is your fundamental skills along with experiences, knowing not just the tools, also the various techniques of what to use when, where, why and how.A tradecraft gap exists when there is work to be done, people are available to fulfill those tasks, yet they lack the skills and experiences to do what is needed. For example, you have a position opening to support some function in your data infrastructure environment; many people are applying for that spot. Perhaps all of those applicants have tons of certificates, yet they lack the skills experience for the position. In other words, there is no shortage of people and their certificates, yet there is a gap between the workers and work to be done.To read this article in full or to leave a comment, please click here

IDG Contributor Network: Do you have an IT trade craft skills gap?

Do you have, or does your data infrastructure environment have a tradecraft skills gap?Keep in mind that tradecraft is your fundamental skills along with experiences, knowing not just the tools, also the various techniques of what to use when, where, why and how.A tradecraft gap exists when there is work to be done, people are available to fulfill those tasks, yet they lack the skills and experiences to do what is needed. For example, you have a position opening to support some function in your data infrastructure environment; many people are applying for that spot. Perhaps all of those applicants have tons of certificates, yet they lack the skills experience for the position. In other words, there is no shortage of people and their certificates, yet there is a gap between the workers and work to be done.To read this article in full or to leave a comment, please click here

IDG Contributor Network: Do you have an IT trade craft skills gap?

Do you have, or does your data infrastructure environment have a tradecraft skills gap?Keep in mind that tradecraft is your fundamental skills along with experiences, knowing not just the tools, also the various techniques of what to use when, where, why and how.A tradecraft gap exists when there is work to be done, people are available to fulfill those tasks, yet they lack the skills and experiences to do what is needed. For example, you have a position opening to support some function in your data infrastructure environment; many people are applying for that spot. Perhaps all of those applicants have tons of certificates, yet they lack the skills experience for the position. In other words, there is no shortage of people and their certificates, yet there is a gap between the workers and work to be done.To read this article in full or to leave a comment, please click here

Troubleshooting Cisco Network Elements with the USE Method

I want to draw some attention to a new document I’ve written titled “Troubleshooting Cisco Network Elements with the USE Method“. In it, I explain how I’ve taken a model for troubleshooting a complex system–the USE Method, by Brendan Gregg–and applied it to Cisco network devices. By applying the USE Method, a network engineer can perform methodical troubleshooting of a network element in order to determine why the NE is not performing/acting/functioning as it should.

I ask that if you’re familiar with a given Cisco network platform (or platforms), that you please contribute commands that would also fit into the USE Method! My list is just a start and I welcome contributions from others in order to make it a stronger, more valuable reference.

Please check out the guide: Troubleshooting Cisco Network Elements with the USE Method

Original article: Troubleshooting Cisco Network Elements with the USE Method

Copyright © 2017 Joel Knight . All Rights Reserved.

SDxCentral’s Top 10 Articles — July 2017

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What is IPv6 Dual stack? What does IPv6 dual stack exactly mean?

What is IPv6 dual stack ?  From some questions and comments on the website, I understand that there is a confusion about it. So, what does exactly dual stack IPv6 mean ?   IPv6 is not a luxury anymore. It is not avoidable for the Service Providers especially.   The biggest problem for the Service Providers […]

The post What is IPv6 Dual stack? What does IPv6 dual stack exactly mean? appeared first on Cisco Network Design and Architecture | CCDE Bootcamp | orhanergun.net.

14 Storage Startups Breaking New Ground

Why ALL African Internet and Data operators should be attending AfPIF-2017

Configuring Voice VLANs

Today I am going to talk about the Voice VLAN. The Voice VLAN feature enables the VLAN to carry the voice traffic. So you have a switch with is connected to the IP Phones, it can be of Cisco Avaya or any other and is connected to the specified VLANs or you can name them Voice VLANs in your network. So when switch is connected to the IP phones, the connected switch sends the voice traffic with layer 3 IP precedence and Layer 2 class of service in short name as COS values which are set as default of value 5. That is the reason because the sound quality of an IP phone call can deteriorate if the data is unevenly sent, the switch supports quality of service (QoS) based on IEEE 802.1p CoS. 

Fig 1.1- Sample Topology- Switch and IP Phone

We can configure an access port with an attached Cisco IP Phone to use one VLAN for voice traffic and another VLAN for data traffic from a device attached to the phone. We can configure access ports on the switch to send Cisco Discovery Protocol (CDP) packets that instruct an attached phone to Continue reading

The Languages Which Almost Became CSS

This was adapted from a post which originally appeared on the Eager blog. Eager has now become the new Cloudflare Apps.

In fact, it has been a constant source of delight for me over the past year to get to continually tell hordes (literally) of people who want to – strap yourselves in, here it comes – control what their documents look like in ways that would be trivial in TeX, Microsoft Word, and every other common text processing environment: “Sorry, you’re screwed.”

— Marc Andreessen 1994

When Tim Berners-Lee announced HTML in 1991 there was no method of styling pages. How a given HTML tag was rendered was determined by the browser, often with significant input from the user’s preferences. To Continue reading

Troubleshooting Cisco Network Elements with the USE Method

Troubleshooting Cisco Network Elements with the USE Method

Getting Started: Writing Your First Playbook

Welcome to another post in our Getting Started series. Keep reading to learn how to draft a Playbook that can be run in Ansible or Ansible Tower. You can also use it along with the Module Index and the other docs to build your own Playbooks later.

What is a Playbook?

Playbooks are esentially sets of instructions (plays) that you send to run on a single target or groups of targets (hosts). Think about the instructions you get for assembling an appliance or furniture. The manufacturer includes instructions so you can put the parts together in the correct order. When followed in order, the furniture looks like what was purchased.

That's basically how a Playbook works.

The Playbook we're building will install a web server on a target RHEL/CentOS 7 host, then write an index.html file based on a template file that will reside with the final Playbook. You'll be able to take the example Playbook and additional files from this blog and test it out for yourself. While going over the example Playbook, we'll explain the modules that are used.

The author adds instructions for the modules to run, often with additional values (arguments, locations, etc. Continue reading

EVPN-VXLAN lab – basic L2 switching

My EVPN-VXLAN lab topology:

There is IP Fabric in DC1 (2 vMX and 2 vQFX), and 2 vMX_v14 to emulate CE devices. Each CE device connected to EVPN via LACP LAG ae0 (EVPN Active-Active ethernet segment on service side). vMX_old-1 also has sigle-homed interface ge-0/0/4 (just to show you the difference).
Each CE device split into two logical systems for more convenient testing of routing functionality (global device context for Vlan100 and logical-system second for Vlan200). You could also use virtual-router routing instances for that, if you prefer this way. The rest of CE config is pretty self-explanatory:

IDC: SD-WAN growth is exploding for at least the next 5 years

As network pros rely more and more on SD-WAN to streamline connections among enterprise sites, the market for this technology will balloon from $225 million in 2015 to $1.19 billion by the end of this year, according to IDC.Over the next five years, SD-WAN sales will grow at a 69% compound annual growth rate, hitting $8.05 billion in 2021, according to IDC’s Worldwide SD-WAN Forecast, 2017–2021.As businesses adopt what IDC calls “third-platform” technologies such as cloud, mobile, big data and analytics, they put increased strain on the network. As organizations look to better connect their remote and branch office employees and provide them better quality network services, SD-WAN will continue to grow.To read this article in full or to leave a comment, please click here

IDC: SD-WAN growth is exploding for at least the next 5 years

As network pros rely more and more on SD-WAN to streamline connections among enterprise sites, the market for this technology will balloon from $225 million in 2015 to $1.19 billion by the end of this year, according to IDC.Over the next five years, SD-WAN sales will grow at a 69% compound annual growth rate, hitting $8.05 billion in 2021, according to IDC’s Worldwide SD-WAN Forecast, 2017–2021.As businesses adopt what IDC calls “third-platform” technologies such as cloud, mobile, big data and analytics, they put increased strain on the network. As organizations look to better connect their remote and branch office employees and provide them better quality network services, SD-WAN will continue to grow.To read this article in full or to leave a comment, please click here

Worth Reading: LinkedIn passes an IPv6 milestone

Since we enabled IPv6 on our mail servers in 2013 and then on our web site in 2014, we have seen increased growth of our external IPv6 traffic. We are currently working on enabling IPv6 on our all of our internal networks and applications in order to begin removing IPv4 internally, beginning in 2018. The external network and public services will still support IPv4 (for compatibility with legacy clients) for years to come, but we anticipate the proportion of our external traffic served over IPv6 to only increase. The community has seen tangible benefits from serving content over IPv6 compared to IPv4. We, too, see some performance improvements on IPv6. —LinkedIn Engineering Blog

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