GNMI. Part 1. Intro to Protobuf.
Hello my friend,
Some time ago we have covered in-depth OpenConfig with NETCONF configuration as well as the OpenConfig telemetry with NETCONF. Today we want to make a next step and start discussion about another approach to manage the network elements in a programmatic way, which is gNMI.
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Network automation training – self-paced and live online
Following your asks we open a new format for the network automation training – self-paced format:
- It doesn’t matter what your timezone is.
- It doesn’t matter how much hours weekly do you have to study.
- It doesn’t matter how solid is your current background in automation, scripting and software development.
You decide on your own when, how often and how quickly you can learn.
However, if you want to join groups, that is something we are happy to offer you as well.
At this training we teach you all the necessary concepts such as YANG data modelling, working with JSON/YAML/XML Continue reading
What If… There Would Be an Easy Way to Run Your Network
Imagine a life where you would be able to…
- Find all interfaces that have VRRP configured but no useful VRRP neighbor;
- Find all OSPF adjacencies that should be up but are not;
- Get an alert every time the default IP route is lost;
- Find all MTU mismatches in your network;
- List all VXLAN-to-VLAN mappings across your data center, and find if two different VLANs map into the same VXLAN VNI;
- Compare IP routes in your data center to those you had yesterday;
- Verify that IP routing tables on all spine switches contain the same prefixes;
- Do the same comparison before and after a software upgrade;
- Identify changes in IP routing tables or ARP tables that happened between yesterday evening and this morning;
… and be able to do all that in a multi-vendor environment without writing tons of Ansible playbooks or Python code.
Juniper Default ARP Policer
Juniper devices have a default ARP policer that drops ARP requests and responses over 150kbps. By default, this is an aggregate policer that applies to all interfaces. This can lead to unexpected behavior when high levels of ARP on one interface lead to BGP session drops on another interface. You can’t change the default policer limits, but you can create a new policer, with higher limits.
Problem: IPv4 BGP Session Flaps on PNI
I was investigating a problem reported by one of our Transit providers. Once a day or so, our IPv4 BGP session with them would flap. The interface itself was stable, and the IPv6 session remained up. One particular site was seeing this more than others. The sites used different platforms, but were running the same code version.
The curious thing was the logs - we saw log messages saying that we had a notification message saying NOTIFICATION received from 192.0.2.188 (External AS 64498): code 4 (Hold Timer Expired Error). The syslog included this hold timer 30s, hold timer remain 0s, last sent 2s. So our router thought it was sending regular KEEPALIVE messages, but the remote end thought it had missed too many.
Looking Continue reading
Juniper Default ARP Policer
Juniper devices have a default ARP policer that drops ARP requests and responses over 150kbps. By default, this is an aggregate policer that applies to all interfaces. This can lead to unexpected behavior when high levels of ARP on one interface lead to BGP session drops on another interface. You can’t change the default policer limits, but you can create a new policer, with higher limits.
Problem: IPv4 BGP Session Flaps on PNI
I was investigating a problem reported by one of our Transit providers. Once a day or so, our IPv4 BGP session with them would flap. The interface itself was stable, and the IPv6 session remained up. One particular site was seeing this more than others. The sites used different platforms, but were running the same code version.
The curious thing was the logs - we saw log messages saying that we had a notification message saying NOTIFICATION received from 192.0.2.188 (External AS 64498): code 4 (Hold Timer Expired Error). The syslog included this hold timer 30s, hold timer remain 0s, last sent 2s. So our router thought it was sending regular KEEPALIVE messages, but the remote end thought it had missed too many.
Looking Continue reading
Money Moves: April 2020
Nokia faced a hostile takeover bid; Google eyeing a D2iQ purchase; T-Mobile to slash $30M in cloud...
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Worth Watching: Dangers of Celebrity in Tech
A tweet by Corey Quinn pointed me to his hilarious riff on the you are not Google and don’t have the same problems theme. Enjoy!
Rakuten Mobile ‘Working Like Crazy’ to Deploy 5G Next Month
"We might be slowed down on the number of base stations that we are able to construct, but I...
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Interesting: Hugo with Docsy and AWS Amplify
Mat Jovanovic decided to follow my lead and migrate his blog from Blogger to Hugo, using Docsy theme, AWS Amplify as the CI/CD pipeline, and AWS S3 as the hosting platform.
Nice job… but he did way more than that - he documented the whole process, including tool selection, setup, and Blogger migration.
Thank you Mat! Every time I see someone publishing blog posts about open-source tools on Medium I’ll send them a link to your blog (with a comment “this is how you should blog about open-source solutions").
BPF Compiler Collection – BCC in short
Network Tracing sometimes is really important, although most of the times tcpdump utility is quite handy there are other tools that can make life much easier.
while am no expert in eBPF and scripts, i do know how to use bcc-tools in some scenarios.
https://github.com/iovisor/bcc/blob/master/INSTALL.md#ubuntu—binary
Alright What is the scenario:
Let’s start with something small, you want to measure TCP connection latency.
Other interesting options, you can capture lifetime, stats and most importantly TCP-Retransmissions
Ebpf filters are safer and more powerful to implement, give this a consideration during any Linux troubleshooting scenarios.
-Rakesh
AWS S3 Cloudfront Static Website Hosting
How to host a static site on AWS using S3 and Cloudfront.AWS S3 Cloudfront Static Website Hosting
I recently migrated my blog to AWS, since it was mostly static content I did not see much point in maintaining at VM and a tech stack just to to host static content. It was overkill. There are a lot of options for hosting a static site these days but since I am currently learning AWS so it...Daily Roundup: Cisco Patches Firewall Bugs
Cisco patched firewall bugs; Amazon threw another JEDI tantrum fit ; and Dish fought off critics,...
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Heavy Networking 516: Is LISP The Overlay Of The Future?
On today's Heavy Networking podcast, guest Cory Steele visits the podcast to make the case that overlays such as LISP offer unique benefits for the network. Greg Ferro disagrees, and makes the case for protocols like QUIC, TLS, and IPSec, and argues for the concept of end-to-end connectivity as the IP network was intended.
The post Heavy Networking 516: Is LISP The Overlay Of The Future? appeared first on Packet Pushers.
Heavy Networking 516: Is LISP The Overlay Of The Future?
On today's Heavy Networking podcast, guest Cory Steele visits the podcast to make the case that overlays such as LISP offer unique benefits for the network. Greg Ferro disagrees, and makes the case for protocols like QUIC, TLS, and IPSec, and argues for the concept of end-to-end connectivity as the IP network was intended.Getting Started with pyATS (and Genie)
What is Python Automated Test System (pyATS)? None of the answers I found to this question really made much sense to me initially. A Python3 based Test Automation and Validation Framework developed by Cisco (but open and extensible to any vendor) is probably the best short answer but still too vague. Add in Genie because, READ MORE
The post Getting Started with pyATS (and Genie) appeared first on The Gratuitous Arp.
Internet During Shutdown: Do We Need More Internet?
The Internet Society India Chennai Chapter organized a virtual roundtable in March, a few days after the Indian government announced a three-week nationwide lockdown. The virtual roundtable was a conversation on the importance of keeping the Internet open, and on the ways in which the Internet community could contribute to COVID-19 response and recovery in India and around the globe.
The virtual roundtable brought together a wide range of Internet stakeholders, including Andrew Sullivan, Jane Coffin, Mike Godwin, Yrjö Länsipuro, Wolfgang Kleinwächter, Olivier Crepin-Leblond, Sébastien Bachollet, Samiran Gupta, and Glen McKnight, as well as members of the Chapter from civil society and the private sector.
Some key highlights and takeaways from the virtual roundtable include the following:
The COVID-19 pandemic underscores the importance of the Internet. Without access, people are unable to communicate with family members and health workers, and participate in online learning and remote work.
The pandemic has clearly exposed the inequalities in Internet access and affordability – the digital divide across the region. Connecting the billions of people who are not yet connected must be a priority. At the same time, their privacy and autonomy must be protected.
Internet technologies can help us fight against the pandemic. Continue reading
Dish Fights Off Critics, Claims 5G Efforts on Track
Despite the calamity brought on by COVID-19, Dish still plans to launch 5G service in a single...
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Weekly Wrap: Nutanix Furloughs 25% of Workforce Citing COVID-19
SDxCentral Weekly Wrap for May 8, 2020: Nutanix to furlough 25% of its workforce; IBM wears Red Hat...
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‘SD-WAN Has to Evolve,’ Says Cisco Exec
Steven Wood, Cisco’s principal engineer of enterprise architectures and SD-WAN, made the...
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