Jesus Illescas
@netcode.rocks
Dev enthusiast, Developer Advocate at Cisco DevNet
Reposted by Jesus Illescas
Another #TalesFromTheTechCrypt
That moment when you apply a new ACL to a remote device... followed by the cold panic when your SSH session vanishes and won't come back. 🥶
Don't worry, the 3-hour drive to the data center will give you plenty of time to remember the `reload in 5` command next time.
That moment when you apply a new ACL to a remote device... followed by the cold panic when your SSH session vanishes and won't come back. 🥶
Don't worry, the 3-hour drive to the data center will give you plenty of time to remember the `reload in 5` command next time.
October 24, 2025 at 6:00 PM
Another #TalesFromTheTechCrypt
That moment when you apply a new ACL to a remote device... followed by the cold panic when your SSH session vanishes and won't come back. 🥶
Don't worry, the 3-hour drive to the data center will give you plenty of time to remember the `reload in 5` command next time.
That moment when you apply a new ACL to a remote device... followed by the cold panic when your SSH session vanishes and won't come back. 🥶
Don't worry, the 3-hour drive to the data center will give you plenty of time to remember the `reload in 5` command next time.
The timing for this mail was spot on, considering that October is the #cybersecurity awareness month. My vault seems to be hacked, according to the h[u]shicorp team. Good thing I don't even have a vault. Another example is to swap rn for m very common for Microsoft.
#CiscoDevNet
#CiscoDevNet
October 24, 2025 at 8:48 AM
The timing for this mail was spot on, considering that October is the #cybersecurity awareness month. My vault seems to be hacked, according to the h[u]shicorp team. Good thing I don't even have a vault. Another example is to swap rn for m very common for Microsoft.
#CiscoDevNet
#CiscoDevNet
Great event we are planning for #WebSummit we will talk about networking, observability, AI and more importantly have some good time
🚀 In Lisbon 🇵🇹 for #WebSummit? Don’t miss Tech Tiles: The Art of Innovation with Cisco! 🟦
📅 Wed, Nov 12 | 18–21 hrs
📍 Heden Rossio
🎟️ Free
Networks Automation, Observability & AI.
Flash talks, demos, Q&A and more!
RSVP now!
🔗 cs.co/tech-tiles
#Cisco #DevNet
📅 Wed, Nov 12 | 18–21 hrs
📍 Heden Rossio
🎟️ Free
Networks Automation, Observability & AI.
Flash talks, demos, Q&A and more!
RSVP now!
🔗 cs.co/tech-tiles
#Cisco #DevNet
October 23, 2025 at 10:03 AM
Great event we are planning for #WebSummit we will talk about networking, observability, AI and more importantly have some good time
Unfortunately I've been of that group, but I guess that's how you get real world experience
Spooky season is here, so we're unearthing our favorite #TalesFromTheTechCrypt.
First up: that chilling moment when you realize you forgot the `add` keyword. 😱
`switchport trunk allowed vlan 100` All other VLANs: _poof_
#NetworkNightmares #CiscoDevNet #Networking
First up: that chilling moment when you realize you forgot the `add` keyword. 😱
`switchport trunk allowed vlan 100` All other VLANs: _poof_
#NetworkNightmares #CiscoDevNet #Networking
October 17, 2025 at 4:45 PM
Unfortunately I've been of that group, but I guess that's how you get real world experience
Wow, this new impressive the specs of the new Cisco 8223, 51.2 Tbps. 3RU, Fixed. 64 QSFP-DD 800G! I still remember when 100G was huge. But what caught more my eye, it supports SONiC, with XR planned!
blogs.cisco.com/sp/cisco-sil...
#CiscoDevNet
blogs.cisco.com/sp/cisco-sil...
#CiscoDevNet
Cisco Silicon One P200 Powers the First 51.2T Scale-Across Routing Systems
Learn how the Cisco Silicon One P200 delivers performance robust enough to power AI data center networks.
blogs.cisco.com
October 13, 2025 at 5:51 PM
Wow, this new impressive the specs of the new Cisco 8223, 51.2 Tbps. 3RU, Fixed. 64 QSFP-DD 800G! I still remember when 100G was huge. But what caught more my eye, it supports SONiC, with XR planned!
blogs.cisco.com/sp/cisco-sil...
#CiscoDevNet
blogs.cisco.com/sp/cisco-sil...
#CiscoDevNet
I want to share this video I made. I created a MCP server for Cisco Live. I wanted to practice with gNMI, so I took it as a opportunity to create gNMIBuddy, an over-engineered gNMI collector for LLM. It has a CLI and MCP interfaces. On this video I share my lessons learned.
youtu.be/ealNsG2YkEs?...
youtu.be/ealNsG2YkEs?...
Lessons Learned: Developing an MCP Server for Network Devices
YouTube video by Cisco DevNet
youtu.be
August 5, 2025 at 10:13 AM
I want to share this video I made. I created a MCP server for Cisco Live. I wanted to practice with gNMI, so I took it as a opportunity to create gNMIBuddy, an over-engineered gNMI collector for LLM. It has a CLI and MCP interfaces. On this video I share my lessons learned.
youtu.be/ealNsG2YkEs?...
youtu.be/ealNsG2YkEs?...
Reposted by Jesus Illescas
A programming fact that still amazes me is that the HTTP header which containers the referring url is called "referer", because the developer spelt "referrer" wrong and the spell checker didn't catch it, so it made it into the official standards and they just never changed it lmao
July 11, 2025 at 5:45 AM
A programming fact that still amazes me is that the HTTP header which containers the referring url is called "referer", because the developer spelt "referrer" wrong and the spell checker didn't catch it, so it made it into the official standards and they just never changed it lmao
Simple things like this that just work are what I enjoy. Just copy, paste and boom you have #Ansible working. No need to activate the virtual environment and what happens after it finishes. Just runs, does what is supposed to do and ends.
This is for a repo I will be sharing soon.
#CiscoDevNet
This is for a repo I will be sharing soon.
#CiscoDevNet
June 25, 2025 at 3:43 PM
Simple things like this that just work are what I enjoy. Just copy, paste and boom you have #Ansible working. No need to activate the virtual environment and what happens after it finishes. Just runs, does what is supposed to do and ends.
This is for a repo I will be sharing soon.
#CiscoDevNet
This is for a repo I will be sharing soon.
#CiscoDevNet
Great to see the A2A is now part of the Linux Foundation. For developers this makes easy to pick which protocol to use when there is a de facto standard.
#CiscoDevNet
www.linuxfoundation.org/press/linux-...
#CiscoDevNet
www.linuxfoundation.org/press/linux-...
Linux Foundation Launches the Agent2Agent Protocol Project to Enable Secure, Intelligent Communication Between AI Agents
Linux Foundation Launches the Agent2Agent Protocol Project
www.linuxfoundation.org
June 25, 2025 at 8:34 AM
Great to see the A2A is now part of the Linux Foundation. For developers this makes easy to pick which protocol to use when there is a de facto standard.
#CiscoDevNet
www.linuxfoundation.org/press/linux-...
#CiscoDevNet
www.linuxfoundation.org/press/linux-...
Who knew that shouting to your hard drives could be bad for them? at least that was true 17 years ago. While watching a #eBPF session, I found this funny video (2:00) from no other than Brendan Gregg youtu.be/tDacjrSCeq4?...
Shouting in the Datacenter
YouTube video by Bryan Cantrill
youtu.be
June 23, 2025 at 6:58 PM
Who knew that shouting to your hard drives could be bad for them? at least that was true 17 years ago. While watching a #eBPF session, I found this funny video (2:00) from no other than Brendan Gregg youtu.be/tDacjrSCeq4?...
Reposted by Jesus Illescas
The tech stack of GitHub:
Ruby on Rails (still! one of the largest codebases in the world)
React
Go
Swift
Kotlin
.NET
Own infra + some use of the cloud
Via @ashtom.bsky.social
Ruby on Rails (still! one of the largest codebases in the world)
React
Go
Swift
Kotlin
.NET
Own infra + some use of the cloud
Via @ashtom.bsky.social
June 20, 2025 at 4:20 PM
The tech stack of GitHub:
Ruby on Rails (still! one of the largest codebases in the world)
React
Go
Swift
Kotlin
.NET
Own infra + some use of the cloud
Via @ashtom.bsky.social
Ruby on Rails (still! one of the largest codebases in the world)
React
Go
Swift
Kotlin
.NET
Own infra + some use of the cloud
Via @ashtom.bsky.social
Yesterday was a good day at the DevNet Zone at Cisco Live. I delivered my first session on eBPF, which I was quite nervious, is a new technology I'm learning, but I think it went well. It was also nice to chat with folks at the Share Your Experience booth, come by if you are here.
#CiscoDevNet
#CiscoDevNet
June 11, 2025 at 4:25 PM
Yesterday was a good day at the DevNet Zone at Cisco Live. I delivered my first session on eBPF, which I was quite nervious, is a new technology I'm learning, but I think it went well. It was also nice to chat with folks at the Share Your Experience booth, come by if you are here.
#CiscoDevNet
#CiscoDevNet
Very happy to be at Cisco Live AMER. The #DevNet zone pretty nice. I also I have four sessions this time. The past weeks had been very busy building everything.
#CiscoDevNet
#CiscoDevNet
June 9, 2025 at 1:15 AM
Very happy to be at Cisco Live AMER. The #DevNet zone pretty nice. I also I have four sessions this time. The past weeks had been very busy building everything.
#CiscoDevNet
#CiscoDevNet
Last week I was at #Autoconf3 it was a nice experience. I like the most to chat and exchange ideas with other folks who like network automation.
A common topic were advices for buiding solutions. This picture caught my eye since is very similar to the structure NSO offers among other things
A common topic were advices for buiding solutions. This picture caught my eye since is very similar to the structure NSO offers among other things
June 4, 2025 at 10:47 AM
Last week I was at #Autoconf3 it was a nice experience. I like the most to chat and exchange ideas with other folks who like network automation.
A common topic were advices for buiding solutions. This picture caught my eye since is very similar to the structure NSO offers among other things
A common topic were advices for buiding solutions. This picture caught my eye since is very similar to the structure NSO offers among other things
Reposted by Jesus Illescas
Now THIS is what a customer-centric app is.
Most banks keep sending out warning emails about impersonation and scams.
Any app can implement this capability with a little coding + backend work (assuming their BE sensible enough): and yet Monzo is the first one I’ve heard do it.
Most banks keep sending out warning emails about impersonation and scams.
Any app can implement this capability with a little coding + backend work (assuming their BE sensible enough): and yet Monzo is the first one I’ve heard do it.
June 4, 2025 at 8:10 AM
Now THIS is what a customer-centric app is.
Most banks keep sending out warning emails about impersonation and scams.
Any app can implement this capability with a little coding + backend work (assuming their BE sensible enough): and yet Monzo is the first one I’ve heard do it.
Most banks keep sending out warning emails about impersonation and scams.
Any app can implement this capability with a little coding + backend work (assuming their BE sensible enough): and yet Monzo is the first one I’ve heard do it.
Reposted by Jesus Illescas
🔓 No, your k8s workloads are not safe by default.
In Kubernetes, everything can talk to everything by default, until you write Network Policies.
🛡️ They give you control over:
- Who can talk to whom (L3)
- On which ports (L4)
- Using what verbs and paths (L7)
🧵
In Kubernetes, everything can talk to everything by default, until you write Network Policies.
🛡️ They give you control over:
- Who can talk to whom (L3)
- On which ports (L4)
- Using what verbs and paths (L7)
🧵
June 3, 2025 at 7:00 PM
🔓 No, your k8s workloads are not safe by default.
In Kubernetes, everything can talk to everything by default, until you write Network Policies.
🛡️ They give you control over:
- Who can talk to whom (L3)
- On which ports (L4)
- Using what verbs and paths (L7)
🧵
In Kubernetes, everything can talk to everything by default, until you write Network Policies.
🛡️ They give you control over:
- Who can talk to whom (L3)
- On which ports (L4)
- Using what verbs and paths (L7)
🧵
Interesting example of a multi-agent system from a Cisco colleague. github.com/cnoe-io/agen... it uses either AGNTCY or 2A2 to communicate between agents. I have to spend some time to go through the code.
May 21, 2025 at 7:35 PM
Interesting example of a multi-agent system from a Cisco colleague. github.com/cnoe-io/agen... it uses either AGNTCY or 2A2 to communicate between agents. I have to spend some time to go through the code.
On #vscode I recently discover that copilot can fill the values of the variables/objects when debugging! This is awesome!
Finding an issue on your code sometimes is really hard and debugging is your best friend in those cases.
#CiscoDevNet #DevNet
Finding an issue on your code sometimes is really hard and debugging is your best friend in those cases.
#CiscoDevNet #DevNet
May 9, 2025 at 6:21 PM
On #vscode I recently discover that copilot can fill the values of the variables/objects when debugging! This is awesome!
Finding an issue on your code sometimes is really hard and debugging is your best friend in those cases.
#CiscoDevNet #DevNet
Finding an issue on your code sometimes is really hard and debugging is your best friend in those cases.
#CiscoDevNet #DevNet
Reposted by Jesus Illescas
I’m hoping people will come with their questions for @cisco.com DevNet’s new #eBPF Book Club livestream series - see you there?
Tomorrow, 3pm UK time / 10am Eastern www.youtube.com/live/Y33Uvwi...
Tomorrow, 3pm UK time / 10am Eastern www.youtube.com/live/Y33Uvwi...
What is eBPF? | eBPF Book Club
YouTube video by Cisco DevNet
www.youtube.com
May 6, 2025 at 7:51 PM
I’m hoping people will come with their questions for @cisco.com DevNet’s new #eBPF Book Club livestream series - see you there?
Tomorrow, 3pm UK time / 10am Eastern www.youtube.com/live/Y33Uvwi...
Tomorrow, 3pm UK time / 10am Eastern www.youtube.com/live/Y33Uvwi...
I never felt so criticized by an LLM as today. I confessed after reading my request I can see it was not clear, nevertheless, this is so funny to see.
I believe, when you ask for help, be clear on what you want to do, and the steps you took. I can feel I failed my own advice.
#CiscoDevNet #DevNet
I believe, when you ask for help, be clear on what you want to do, and the steps you took. I can feel I failed my own advice.
#CiscoDevNet #DevNet
May 6, 2025 at 8:43 AM
I never felt so criticized by an LLM as today. I confessed after reading my request I can see it was not clear, nevertheless, this is so funny to see.
I believe, when you ask for help, be clear on what you want to do, and the steps you took. I can feel I failed my own advice.
#CiscoDevNet #DevNet
I believe, when you ask for help, be clear on what you want to do, and the steps you took. I can feel I failed my own advice.
#CiscoDevNet #DevNet
Yesterday found this handy option on vscode "remote.SSH.defaultExtensions" which installs the extensions you specify on the remote host you are connecting.
I prefer to work locally, but sometimes, I need to jump in a VM and I like to have a completed environment there.
#DevNet #CiscoDevNet
I prefer to work locally, but sometimes, I need to jump in a VM and I like to have a completed environment there.
#DevNet #CiscoDevNet
May 2, 2025 at 9:30 AM
Yesterday found this handy option on vscode "remote.SSH.defaultExtensions" which installs the extensions you specify on the remote host you are connecting.
I prefer to work locally, but sometimes, I need to jump in a VM and I like to have a completed environment there.
#DevNet #CiscoDevNet
I prefer to work locally, but sometimes, I need to jump in a VM and I like to have a completed environment there.
#DevNet #CiscoDevNet
Reposted by Jesus Illescas
November 26, 2024 at 12:09 AM
I had some fun trying to figure it out how to use GNMi with XRd. Here you can see a bit more of this little adventure.
The code I used: gist.github.com/jillesca/88c...
Interesting side note. The problem doesn't happen on the XR always-On DevNet Sandbox.
#DevNet #GNMi
The code I used: gist.github.com/jillesca/88c...
Interesting side note. The problem doesn't happen on the XR always-On DevNet Sandbox.
#DevNet #GNMi
April 10, 2025 at 2:02 PM
I had some fun trying to figure it out how to use GNMi with XRd. Here you can see a bit more of this little adventure.
The code I used: gist.github.com/jillesca/88c...
Interesting side note. The problem doesn't happen on the XR always-On DevNet Sandbox.
#DevNet #GNMi
The code I used: gist.github.com/jillesca/88c...
Interesting side note. The problem doesn't happen on the XR always-On DevNet Sandbox.
#DevNet #GNMi
Finally, after some work, here you can find an overview of how I used a graph with #langgraph to troubleshoot an ISIS issue in the network.
youtu.be/i6P-aXiXlIo?...
GitHub repo: github.com/jillesca/onc...
#DevNet
youtu.be/i6P-aXiXlIo?...
GitHub repo: github.com/jillesca/onc...
#DevNet
AI State Graphs for network troubleshooting
YouTube video by Cisco DevNet
youtu.be
March 24, 2025 at 6:13 PM
Finally, after some work, here you can find an overview of how I used a graph with #langgraph to troubleshoot an ISIS issue in the network.
youtu.be/i6P-aXiXlIo?...
GitHub repo: github.com/jillesca/onc...
#DevNet
youtu.be/i6P-aXiXlIo?...
GitHub repo: github.com/jillesca/onc...
#DevNet