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The blog of David Roy

Networking, Troubleshooting, tips and tricks.

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gRPC Telemetry

Here is the presentation I did to present gRPC Telemetry: gRPC-Telemetry Enjoy, David

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JNCIE-DC : The Awesome story of Joao

Hello, I'm very proud to post the story of Joao. He passed recently JNCIE-DC and became one of the firsts JNCIE x4. Joao is a "Juniper Fan" like me. I'm currently preparing JNCIE-DC as well, so I was so happy to read his experience. Enjoy Reading. David...

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Running vQFX 10k on ESXi

Running vQFX 10k on ESXi

As I'm currently studying DC certification track, I decided to setup my first vQFX lab. My current multi-vendors virtual LAB runs on ESXi, so I wished to keep my VMware hypervisor also for vQFX instances. I'm a lucky man, vmdk images for vQFX are now...

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Per VRF accounting solution

Document: Per VRF accounting solution. - Per-VRF-Accounting.pdf Hello, Here after a solution to count input/output traffic per VRF. Tested in stress in Junos 14.2. File is available above. Enjoy reading. David

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My VMX installation guide

My VMX installation guide - VMX-installguide.pdf I'm currently writing the 2nd Edition of the MX Series book. In this new edition, I wrote a chapter dedicated to VMX. The 2nd edition of the book will be released in few months: stay tuned :) ! I spent...

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Using local tcpdump for transit traffic

I was wondering if I can use the embedded tcpdump of Junos to monitor transit traffic. I found a way to do it and this short post explains how to do that. This tip works only on TRIO Line cards. My setup has been tested on Junos 12.3. I used several features:...

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Check your Control Plane

Here it's a short post to explain how you can monitor the control plane activity with ddos-protection's statistics and a simple op-script. ddos-protection is a default feature only available on MPC cards which allows to secure the linecard's CPU and the...

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Inetzero Blog: ISIS Training and Configuration

Inetzero Blog: ISIS Training and Configuration

Read my blog regarding my favorite protocol "ISIS" on The Inetzero blog and prepare your JNCIE exam with their materials:Workbooks and Racks. ISIS Training More regarding Inetzero click there : David

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Inetzero Blog: PIM Anycast RP

Inetzero Blog: PIM Anycast RP

Read my blog regarding the PIM Anycast RP feature on The Inetzero blog and prepare your JNCIE exam with their materials:Workbooks and Racks. PIM ANYCAST BLOG More regarding Inetzero click there : David

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Understanding IPv4 uRPF on Junos DPC/MPC

Understanding IPv4 uRPF on Junos DPC/MPC

uRPF allows anti-spoofing embedded at forwarding plane level. Junos provides this feature for many years with several modes and options: Loose or Strict mode Active or Feasible paths uRPF data base Discard or not supported in the uRPF data base I carried...

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