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  • What happens to packets with a VMware vSphere Distributed Switch?

    calendar Dec 26, 2022 · 4 min read · VMWare Home Lab Datacenter Networking Routing & Switching Studies  ·
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    Distributed Virtual Port-Groups (dvPGs) in vSphere are a powerful tool for controlling network traffic behavior. vSphere Distributed Switches (vDS) are non-transitive Layer 2 proxies and provide us the ability to modify packets in-flight in a variety of complex ways. Note: Cisco UCS implements something similar with …


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  • Scale datacenters past the number of VLAN IDs with NSX-T Tier-0 and Q-in-X

    calendar May 22, 2022 · 4 min read · VMWare Layer 2 Datacenter Networking Routing & Switching Studies NSX-T Design Patterns Network Automation  ·
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    VMware introduced the ability to double-encapsulate layer 2 frames in via the "Access VLAN" option for VRF instances in NSX Data Center: https://docs.vmware.com/en/VMware-NSX-T-Data-Center/3.2/administration/GUID-4CB5796A-1CED-4F0E-ADE0-72BF7B3F762C.html Q-in-VNI provides a capable infrastructure engineer the …


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  • Network Experiments with VMware NSX-T and Cisco Modeling Labs

    calendar Apr 29, 2022 · 4 min read · VMWare Home Lab Datacenter Networking Routing & Switching Studies Programmability Network Automation  ·
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    Cisco Modeling Labs (CML) has turned out to be a great tool for deploying virtual network resources, but the "only Cisco VNFs" limitation is a bit much. Let's use this opportunity to really take advantage of the capabilities that NSX-T has for virtual network labs! Overview For the purpose of lab …


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  • Vendor interoperability with multiple STP instances

    calendar Apr 17, 2022 · 5 min read · Home Lab Layer 2 Datacenter Networking Spanning-Tree Routing & Switching Studies Design Patterns  ·
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    Spanning Tree is the all-important loop prevention method for Layer 2 topologies and source of ire to network engineers worldwide. Usually IT engineers list the Dunning-Kruger Effect in a negative context, depicting an oblivious junior or an unaware manager, but I like to focus on the opposite end of the curve with …


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  • Cisco Modeling Labs

    calendar Mar 26, 2022 · 3 min read · Linux Home Lab Cisco NX-OS NFV Datacenter Networking Routing & Switching Studies Programmability Design Patterns Network Automation  ·
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    Ever wonder what it would be like to have a platform dedicated to Continuous Improvement / Testing / Labbing? Cisco's put a lot of thought into good ways to do that, and Cisco Modeling Labs(CML) is the latest iteration of their solutions to provide this as a service to enterprises and casual users alike. CML is the …


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  • Bogons, and how to leverage public IP feeds with NSX-T

    calendar Jan 16, 2022 · 3 min read · Network Security Datacenter Networking Python Routing & Switching Studies BGP NSX-T Design Patterns  ·
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    Have you ever wondered what happened to all the privately-addressed traffic coming from any home network? Well, if it isn't explicitly blocked by the business, it's routed, and this is not good. Imagine what data leakage can occur when a user mistypes a destination IP - the traffic goes out to the Service Provider, who …


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  • PSA: PAN-OS Drops BGP peers with an invalid NLRI / Always filter inbound prefixes from Avi Vantage

    calendar May 2, 2021 · 2 min read · Datacenter Networking PAN-OS Routing & Switching Studies Avi BGP NSX-T NSX-ALB  ·
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    If Avi Vantage IPAM cannot allocate an address for a new vIP, it will advertise an all-zeros host address - 0.0.0.0/32: This will cause Palo Alto PAN-OS to restart a peer - even if it is not the immediate downstream prefix. Palo Alto uses routed as their dynamic routing engine - so this is probably default behavior …


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  • PAN-OS IPv6 Error: bgp peer local address 0:0:0:0:0:0:0:0 does not belong to interface

    calendar Apr 11, 2021 · 1 min read · IPv6 PAN-OS Routing & Switching Studies BGP  ·
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    When encountering this error, please ensure that "Enable IPv6" is set under interfaces: Hope this helps! Happy IPv6ing!


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  • Design Pattern: Looking Glasses

    calendar Mar 22, 2021 · 3 min read · eBGP Python FOSS/Linux Network Automation Home Lab IPv6 Datacenter Networking iBGP Routing & Switching Studies BGP Programmability Design Patterns  ·
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    It's probably safe to say that service provider networking is pretty unique. One particular design pattern - Looking Glasses - is extremely useful for complex dynamically routed networks. I'd really like to shift the gatekeeping needle here - networks that are complex enough to benefit from a looking glass should move …


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  • Unearned Uptime: Letting Old Ideas Go

    calendar Mar 13, 2021 · 5 min read · Datacenter Networking Routing & Switching Studies Design Patterns Unearned Uptime  ·
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    We don't always earn reliability with the systems we deploy, design, and maintain Infrastructure reliability is a pretty prickly subject for the community - we as engineers and designers tend to anthropomorphize, attach, and associate personal convictions with what we maintain. It's a natural pattern, but it inflicts a …


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ENGYAK.co

A blog about IT

Disclaimer

The opinions expressed on this site are my own personal opinions and do not represent my employer’s view in any way.

Recent Posts

  • Automate Cisco IOS/IOS-XE documentation with Ansible (with examples)
  • Document Networks as Code with D2!
  • Document vSphere as Code with D2!
  • Diagram as Code with D2!
  • Enable ToFU (Trust on First Use) with OpenSSH
  • Deploy vSphere VMs with Ansible!
  • Why Automate? VM Deployment with vSphere's REST API
  • What happens to packets with a VMware vSphere Distributed Switch?

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