After the “shocking” revelation that a network can never be totally reliable, I addressed another widespread lack of common sense: due to laws of physics, the client-server latency is never zero (and never even close to what a developer gets from the laptop’s loopback interface).
After the “shocking” revelation that a network can never be totally reliable, I addressed another widespread lack of common sense: due to laws of physics, the client-server latency is never zero (and never even close to what a developer gets from the laptop’s loopback interface).
Starting with a short message to anyone interested in our on-site events in Switzerland: on March 10th we’re running our first 2020 workshop, focusing on Docker and containers.
I totally reworked the material, adding tons of new Docker networking examples (including deep dive into iptables) and a few fun things like building an Ansible container, or starting the whole NetBox stack with a single command. Even if you don’t plan to deploy containers in your production network, you might drop by just for that part.
And now for the upcoming webinars:
Read more ...Starting with a short message to anyone interested in our on-site events in Switzerland: on March 10th we’re running our first 2020 workshop, focusing on Docker and containers.
I totally reworked the material, adding tons of new Docker networking examples (including deep dive into iptables) and a few fun things like building an Ansible container, or starting the whole NetBox stack with a single command. Even if you don’t plan to deploy containers in your production network, you might drop by just for that part.
And now for the upcoming webinars:
Every now and then someone tries to justify the “wisdom” of migrating VMs from on-premises data center into a public cloud (without renumbering them) with the idea of “scaling out into the public cloud” aka “cloud bursting”. My usual response: this is another vendor marketing myth that works only in PowerPoint.
To be honest, that statement is too harsh. You can easily scale your application into a public cloud assuming that:
Read more ...Every now and then someone tries to justify the “wisdom” of migrating VMs from on-premises data center into a public cloud (without renumbering them) with the idea of “scaling out into the public cloud” aka “cloud bursting”. My usual response: this is another vendor marketing myth that works only in PowerPoint.
To be honest, that statement is too harsh. You can easily scale your application into a public cloud assuming that:
While running the Using VXLAN And EVPN To Build Active-Active Data Centers workshop in early December 2019 I got the usual set of questions about using BGP as the underlay routing protocol in EVPN fabrics, and the various convoluted designs like IBGP-over-EBGP or EBGP-between-loopbacks over directly-connected-EBGP that some vendors love so much.
I got a question along the same lines from one of the readers of my latest EPVN rant who described how convoluted it is to implement the design he’d like to use with the gear he has (I won’t name any vendor because hazardous chemical substances get mentioned when I do).
Read more ...While running the Using VXLAN And EVPN To Build Active-Active Data Centers workshop in early December 2019 I got the usual set of questions about using BGP as the underlay routing protocol in EVPN fabrics, and the various convoluted designs like IBGP-over-EBGP or EBGP-between-loopbacks over directly-connected-EBGP that some vendors love so much.
I got a question along the same lines from one of the readers of my latest EPVN rant who described how convoluted it is to implement the design he’d like to use with the gear he has (I won’t name any vendor because hazardous chemical substances get mentioned when I do).
Imagine you followed the steps taken by Anne Baretta and stored network inventory into a database. What could you do with that information (apart from creating reports)? How about adding a web UI to help less-skilled network operators perform automated tasks?
Notes
Imagine you followed the steps taken by Anne Baretta and stored network inventory into a database. What could you do with that information (apart from creating reports)? How about adding a web UI to help less-skilled network operators perform automated tasks?
Notes
After introducing FRRouting architecture, Donald Sharp dived deep into configuration and performance optimizations, including asynchronous data plane, next hop groups, and commit-and-rollback.
After introducing FRRouting architecture, Donald Sharp dived deep into configuration and performance optimizations, including asynchronous data plane, next hop groups, and commit-and-rollback.
Considering VMware’s enrapturement with vMotion the following news (reported by Salman Naqvi in a comment to my blog post) was clearly inevitable:
I was surprised to learn that LIVE vMotion is supported between on-premise and Vmware on AWS Cloud
What’s more interesting is how did they manage to do it?
Read more ...Considering VMware’s enrapturement with vMotion the following news (reported by Salman Naqvi in a comment to my blog post) was clearly inevitable:
I was surprised to learn that LIVE vMotion is supported between on-premise and Vmware on AWS Cloud
What’s more interesting is how did they manage to do it?
Urban legends claim that Sir Isaac Newton started thinking about gravity when an apple dropped on his head. Regardless of its origins, his theory successfully predicted planetary motions and helped us get people to the moon… there was just this slight problem with Mercury’s precession.
Likewise, his laws of motion worked wonderfully until someone started crashing very small objects together at very high speeds, or decided to see what happens when you give electrons two slits to go through.
Then there was the tiny problem of light traveling at the same speed in all directions… even on objects moving in different directions.
Read more ...Urban legends claim that Sir Isaac Newton started thinking about gravity when an apple dropped on his head. Regardless of its origins, his theory successfully predicted planetary motions and helped us get people to the moon… there was just this slight problem with Mercury’s precession.
Likewise, his laws of motion worked wonderfully until someone started crashing very small objects together at very high speeds, or decided to see what happens when you give electrons two slits to go through.
Then there was the tiny problem of light traveling at the same speed in all directions… even on objects moving in different directions.
I published a blog post describing how complex the underlay supporting VMware NSX still has to be (because someone keeps pretending a network is just a thick yellow cable), and the tweet announcing it admittedly looked like a clickbait.
[Blog] Do We Need Complex Data Center Switches for VMware NSX Underlay
Martin Casado quickly replied NO (probably before reading the whole article), starting a whole barrage of overlay-focused neteng-versus-devs fun.
Read more ...I published a blog post describing how complex the underlay supporting VMware NSX still has to be (because someone keeps pretending a network is just a thick yellow cable), and the tweet announcing it admittedly looked like a clickbait.
[Blog] Do We Need Complex Data Center Switches for VMware NSX Underlay
Martin Casado quickly replied NO (probably before reading the whole article), starting a whole barrage of overlay-focused neteng-versus-devs fun.
What’s the next logical automation step after you cleaned up device configurations and started using configuration templates? It obviously depends on your pain points; for Anne Baretta it was a network inventory database stored in SQL tables (and thus readily accessible from his other projects).
Notes
What’s the next logical automation step after you cleaned up device configurations and started using configuration templates? It obviously depends on your pain points; for Anne Baretta it was a network inventory database stored in SQL tables (and thus readily accessible from his other projects).
Notes