During the Networking in Private and Public Clouds webinar I got an interesting question: “Is it possible to run VMware NSX on redundantly-connected hosts in a pure L3 data center fabric?”
TL&DR: I thought the answer is still No, but after a very helpful discussion with Anthony Burke it seems that it changed to Yes (even through the NSX Design Guide never explicitly says Yes, it’s OK and here’s how you do it).
Read more ...One of the toughest challenges you can face as a networking engineer is trying to understand what the customer really needs (as opposed to what they think they’re telling you they want).
For example, the server team comes to you saying “we need 5 VLANs between these 3 data centers”. What do you do?
Read more ...Wondering how exactly routing on hosts works? Dinesh Dutt explained the details in this 10-minute video during the Leaf-and-Spine Fabric Designs webinar.
I published the third installment of the Optimize Your Data Center Infrastructure story on my main web site. In this part I’m telling you to go with 10GE and consider 25GE.
Here’s an interesting blog post (particularly as it’s coming from a well-known cloud evangelist): at the infrastructure level stability matters more than agility or speed-of-deployment. Welcome to real world ;)
After the last US-based ipSpace.net workshop a lot of people asked me about the next one. It took a long time, but here it is: I’m running an on-site automation workshop together with several friends with outstanding hands-on experience in Colorado in late May.
Read more ...During Cisco Live Europe 2017 (where I got thanks to the Tech Field Day crew kindly inviting me) I had a nice chat with Peter Jones, principal engineer @ Cisco Systems. We started with a totally tangential discussion on why startups fail, and quickly got back to flexible hardware and why one would want to have it in a switch.
Read more ...I recently finished editing the videos from the Leaf-and-Spine Designs update to the Leaf-and-Spine Fabrics webinar, so it wasn’t hard to select the featured webinar for April 2017. The featured videos now include BGP in the Data Center by Dinesh Dutt, SPB Deep Dive by Roger Lapuh, and VXLAN with EVPN control plane by Lukas Krattiger.
Read more ...One of my readers considered joining the Building Network Automation Solutions course but wasn’t sure whether it would help him solve the challenges he’s facing in his network.
Fortunately, his challenges aren’t that hard to solve.
Read more ...Evgeny made an interesting observation while testing the NETCONF client on IOS XE 16.x (see also this comment on my blog):
The most interesting part: for unknown reason IOS-XE gives different answers about capabilities on ports 830 and 22.
Einar quickly explained the mysterious behavior:
Read more ...In case you’re wondering why we’re stuck with old stuff like TCP, IPv4, OSPF, and a few other bits and pieces that were invented decades ago when we could be using the glitzy controller-based software-defined whatever, read the blog post by Martin Sustrik. He talks about software, but we’re facing the same challenges in networking.
Lukas Krattiger (Cisco Systems) was the guest speaker in Layer-2+3 fabrics part of the Leaf-and-Spine Fabric Design webinar, and he started his presentation with an overview of how we use overlays in data center fabrics.
Most network automation presentations you can find on the Internet focus on configuration management, either to provision new boxes, or to provision new services, so it’s easy to assume that network automation is really a fancy new term for consistent device configuration management.
However, as I explained in the Network Automation 101 webinar, there’s so much more you can do and today I’d like to share a real-life example from Jaakko Rautanen, an alumni of my Building Network Automation Solutions online course.
Read more ...Johannes Weber built a CCNP practice lab, configured 22 different protocols in it, and took packet captures of all of them happily chatting. To make things more interesting he created 45 challenges that you can solve with Wireshark using the pcap file he published.
One of my readers sent me a link to CCO documentation containing this gem:
Beginning with Cisco NX-OS Release 7.0(3)I2(1), Cisco Nexus 9000 Series switches handle the CLI configuration actions in a different way than before the introduction of NX-API and DME. The NX-API and DME architecture introduces a delay in the communication between Cisco Nexus 9000 Series switches and the end host terminal sessions, for example SSH terminal sessions.
So far so good. We can probably tolerate some delay. However, the next sentence is a killer…
2017-04-05: The wonderful information disappeared from Cisco's documentation within 24 hours with no explanation whatsoever. However, I expected that and took a snapshot of that page before publishing the blog post ;)
Read more ...My Why Do We Need Session Stickiness in Load Balancing blog post generated numerous interesting comments and questions, so I decided to repost them and provide slightly longer answers to some of the questions.
Warning: long wall of text ahead.
Read more ...During Cisco Live Europe (huge thanks to Tech Field Day crew for bringing me there) I had a chat with Jeff McLaughlin about NETCONF support on Cisco IOS XE, in particular on the campus switches.
We started with the obvious question “why would someone want to have NETCONF on a campus switch”, continued with “why would you use NETCONF and not REST API”, and diverted into “who loves regular expressions”. Teasing aside, we discussed:
Read more ...I’m running a hyperconverged infrastructure event with Mitja Robas on April 6th, and so my friend Christoph Jaggi sent me a list of interesting questions, starting with:
What are hyperconverged infrastructures?
The German version of the interview is published on inside-it.ch.
Read more ...Imagine a Flatworld in which railways are the main means of transportation. They were using horses and pigeons in the past, and experimenting with underwater airplanes, but railways won because they were cheaper than anything else (for whatever reason, price always wins over quality or convenience in that world).
As always, there were multiple railroad tracks and trains manufacturers, and everyone tried to use all sorts of interesting tricks to force the customers to buy tracks and trains from the same vendor. Different track gauges and heptagonal wheels that worked best with grooved rails were the usual tricks.
Read more ...Niki Vonderwell kindly invited me to Troopers 2017 and I decided to talk about security and reliability aspects of network automation.
The presentation is available on my web site, and I’ll post the link to the video when they upload it. An extended version of the presentation will eventually become part of Network Automation Use Cases webinar.