Blog Posts in June 2017
Got this remark from one of my SDN mailing list subscribers:
There are NMSs that are based on SNMP, their manufacturers that say they can replace an SDN architecture, because they allow to automate the management of the network.
I get a “how do I get started with network automation” question every other week, and when I wrote a lengthy reply to one about configuration templating of existing snowflake network on networktocode Slack channel I decided it’s time to turn my replies into a blog post.
Here’s the question I got from one of my readers:
Do you have any data available to show the benefits of jumbo frames in 40GE/100GE networks?
In case you’re wondering why he went down this path, here’s the underlying problem:
I developed over a dozen different Ansible-based network automation solutions in the last two years for my network automation workshops and online course, and always published them on GitHub… but never built an index, or explained what they do, and why I decided to do things that way.
With the new my.ipSpace.net functionality I added for online courses I got the hooks I needed to make the first part happen:
One of my readers sent me a list of questions on asymmetrical traffic flows in IP networks, particularly in heavily meshed environments (where it’s really hard to ensure both directions use the same path) and in combination with stateful devices (firewalls in particular) in the forwarding path.
Unfortunately, there’s no silver bullet (and the more I think about this problem, the more I feel it’s not worth solving).
The inevitable summer decline of visitors has started, so I'm switching (like every summer) to a lower publishing frequency. Given my current focus (here and here) expect one network automation post and one other in-depth post every week… and maybe an occasional this-is-worth-reading link.
Take some time off, enjoy the vacations, and I hope to meet you in the September online course ;)
Monitoring SDN Networks is the featured webinar of June 2017, and in the featured video Terry Slattery (CCIE#1026) talks about network analysis of SDN.
If you’re a trial subscriber, log into my.ipspace.net, select the webinar from the first page, and watch the video marked with star… and if you’d like to try the ipSpace.net subscription register here.
- Patrick Ogenstad (author of numerous open-source network automation modules and libraries) will talk about his journey to network automation, and lessons learned on the way.
- David Barroso will talk about his newest project: support of OpenConfig in NAPALM and Ansible (also discussed on a recent podcast).
Sounds promising? Why don’t you register before we run out of early-bird tickets?
If you'd come to me as a networking engineer and say “there's one new thing I want to learn that's outside of my $dayjob” I'd probably say “invest some serious time into learning Git (beyond memorizing the quick recipes) if you haven’t done that already”
Full disclosure: not so long ago I tried to avoid Git as much as possible… and then it suddenly clicked ;)
Imagine a service provider that allows you to provision 100GE point-to-point circuit between any two of their POPs through a web site and delivers in seconds (assuming you’ve already solved the physical connectivity problem). That’s the whole idea of SDN, right? Only not so many providers got there yet.
Long story short: I’m launching Ansible for Networking Engineers self-paced course today. It’s already online and you can start whenever you wish.
Now for the details…
Isn’t there already an Ansible for Networking Engineers webinar? Yes.
So what’s the difference? Glad you asked ;)
During Shawn Zandi’s presentation describing large-scale leaf-and-spine fabrics I got into an interesting conversation with an attendee that claimed it might be simpler to replace parts of a large fabric with large chassis switches (largest boxes offered by multiple vendors support up to 576 40GE or even 100GE ports).
As always, you have to decide between implicit and explicit complexity.
Last week I published self-study exercises for the YAML and Jinja2 modules in the Ansible for Networking Engineers webinars, and a long list of review questions for the Using Ansible and Ansible Deeper Dive sections.
I also reformatted the webinar materials page. Hope you’ll find the new format easier to read than the old one (it’s hard to squeeze over 70 videos and links on a single page ;).
Michael Klose left an interesting remark on my Regional Internet Exits in Large DMVPN Deployment blog post saying…
Would BGP communities work? Each regional Internet Exit announce Default Route with a Region Community and all spokes only import default route for their specific region community.
That approach would definitely work. However, you have to decide where to move the complexity.