Would you recommend your SIP trunking provider to a friend? See which providers came out on top in the Eastern Management Group's customer satisfaction study that surveyed more than 3,000 IT managers.
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Following on his previous work with Cisco ACI Dirk Feldhaus decided to create an Ansible playbook that would create and configure a new tenant and provision a vSRX firewall for the tenant when working on the Create Network Services hands-on exercise in the Building Network Automation Solutions online course.
Read more ...LegoOS: a disseminated, distributed OS for hardware resource disaggregation Shan et al., OSDI’18
One of the interesting trends in hardware is the proliferation and importance of dedicated accelerators as general purposes CPUs stopped benefitting from Moore’s law. At the same time we’ve seen networking getting faster and faster, causing us to rethink some of the trade-offs between local I/O and network access. The monolithic server as the unit of packaging for collections of such devices is starting to look less attractive:
To fully support the Continue reading
When a process writes to a socket that has received an RST, the SIGPIPE signal is sent to the process. The default action of this signal is to terminate the process, so the process must catch the signal to avoid being involuntarily terminated.
On a BGP-routed network with multiple redundant paths, we seek to achieve two goals concerning reliability:
A failure on a path should quickly bring down the related BGP sessions. A common expectation is to recover in less than a second by diverting the traffic to the remaining paths.
As long as a path is operational, the related BGP sessions should stay up, even under duress.
To quickly detect a failure, BGP can be associated with BFD, a protocol to detect faults in bidirectional paths,1 defined in RFC 5880 and RFC 5882. BFD can use very low timers, like 100 ms.
However, when BFD runs in a process on top of a generic kernel,2 notably when running BGP on the host, it is not unexpected to loose a few BFD packets on adverse conditions: the daemon handling the BFD sessions may not get enough CPU to answer in a timely manner. In this scenario, it is not unlikely for all the BGP sessions to go down at the same time, creating an outage, as depicted in the last case in the diagram below.
Back in July of this year I introduced Polyglot, a project whose only purpose is to provide a means for me to learn more about software development and programming (areas where am I sorely lacking real knowledge). In the limited spare time I’ve had to work on Polyglot in the ensuing months, I’ve been building out an API specification using RAML, and in this post I’ll share how I use Docker and a Docker image to validate my RAML files.
Since I was (am) using Visual Studio Code as my primary text editor/development environment these days, I started out by looking for a RAML extension that would provide some sort of linting/validation functionality. I found an extension to do RAML syntax highlighting, which seemed like a reasonable first step.
After a bit more research, I found that there was a raml-cli NPM package that one could use to validate RAML files from the command line. I was a bit leery of installing an NPM package on my system, so I thought, “Why not use a Docker container for this?” It will keep my system clean of excess/unnecessary packages and dependencies, and it will provide some practice with Continue reading
consolidated posts from the VMware on VMware blog
Are you someone that prefers a blank sheet of paper or an empty text pad screen? Do you get the time to have that thought process to create the words, images or code to fill that empty space? Yes to both — I’m impressed! Creating something from scratch is an absolutely magical feeling especially once it gets to a point of sharing or usefulness. However, many of us spend a bit more of our time editing, building upon or debugging. Fortunately, that can be pretty interesting as well.
In the case of setting up mico-segmentation with VMware NSX Data Center, you have a couple options on quickly getting started:
Those resources and more are great jumping off points especially since you likely have more than just Informatica, Oracle and SAP apps in your environments.
Now, should you have those Informatica, Oracle and SAP apps, then here’s the next level of details. I’m Continue reading
SDxCentral Weekly Wrap for October 19, 2018. Ericsson's third quarter results get overshadowed by an ongoing corruption scandal.
The platform allows enterprise customers to deploy and manage applications and services that reside in the carrier’s private cloud. It comes with a 99.9 percent SLA for uptime.
The company opened on the NYSE at $15.30 per share and offered 25 million shares.
Human beings as we are, struggle sometimes to think multi-dimensionally about tasks. Our brains seem to have a conscious layer and a sub-conscious layer. Whether you think in words, noise or images, your brain is a single threaded engine with a silent co-processor that can either assist or annoy. Experience has shown that we look at network automation challenges through this shaped lens and try and solve things that makes sense to humans, but not necessarily for mechanized processes.
In an attempt not to lose my own thread, I’ll try and explain some different view points through examples.
Making a a cup of tea is a very English thing to do and the process of making one will suffice for this example.
Let’s look at the process involved:
// { type: activity}
(Start)-><a>[kettle empty]->(Fill Kettle)->|b|
<a>-(note: Kettle activities)
<a>[kettle full]->|b|->(Boil Kettle)->|c|
|b|->(Add Tea Bag)-><d>[Sugar: yes]->(Add Sugar)->(Add Milk)
<d>[Sugar: no]->(Add Milk)
<d>-(note: Sweet tooth?)
(Add Milk)->|c|->(Pour Boiled Water)
(Pour Boiled Water)->(Enjoy)->(Stop)
Fig.1
This makes us a relative standard cup of English breakfast tea.
Let’s assume macros exist for milk and sugar quantity and the dealing of a mug or best china Continue reading
