New book: Kubernetes for vSphere Administrators…

New book: Kubernetes for vSphere Administrators now available

New book: Kubernetes for vSphere Administrators…

I’m delighted to report that my new book, Kubernetes for vSphere Administrators, is now available. It is available in both paper form and as a Kindle eBook. Links to both are provided below. The links above direct you to Amazon.com. However the book is available in other Amazon marketplaces as well. (If you can’t see the text+images above, this is a link to the paper book and this is a link to the eBook.) I hope readers of this book find it useful. I would be delighted to receive feedback and…Read More

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Announcement! vSAN Deep Dive book updated for…

Announcement! vSAN Deep Dive book updated for…

I am delighted to announce an updated version of the vSAN Deep Dive book. It’s been a while since we did an update to this book. The most recent version was for vSAN 6.7 U1. A lot has changed since then. We’ve seen the arrival of some significant features such as vSAN File Service and HCI-Mesh.

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Multi-Tenancy Datacenter with NSX EVPN

Multi-Tenancy Datacenter with NSX EVPN

The data center landscape has radically evolved over the last decade thanks to virtualization. Before Network Virtualization Overlay (NVO), data centers were limited to 4096 broadcast domains which could be problematic for large data centers to support a multi-tenancy architecture. Virtual […]

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Advanced Supply Chain Choreography Now Included…

Advanced Supply Chain Choreography Now Included…

VMware Tanzu Community Edition now includes advanced software supply chain tooling that helps application teams deliver software more rapidly, securely, and efficiently at scale. The 0.11 release of Tanzu Community Edition, available today, introduces new supply chain choreography capabilities […]

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CSCvz43359 Traffic using GENEVE overlay sometimes leaves wrong VNIC when GENEVE Offload is enabled on VIC14xx – FIX

According Release Notes for Cisco UCS Manager, Release 4.2(1l) We have a fix for CSCvz43359 Traffic using GENEVE overlay sometimes leaves wrong VNIC when GENEVE Offload is enabled on VIC14xx:

Defect IDSymptomFirst Bundle AffectedResolved in Release
The following caveats related to NSX-T are resolved in Release 4.2(1l)
CSCvz43359On a Cisco UCS server using an NSX-T topology, data traffic using a GENEVE overlay sometimes left the wrong vNIC when GENEVE Offload was enabled on a VIC 1400 series Fabric Interconnect. This issue is resolved.4.2(1d)C4.2(1l)C

Traffic using GENEVE overlay sometimes leaves wrong VNIC when GENEVE Offload is enabled on VIC14xx

Symptom: Rapid mac moves observed on Fabric Interconnect and northbound switches where mac address belongs to device using GENEVE overlay. pkcatp-uw in ESXi kernel was not able to observe this phenomenon. This was only observable via tcpdump on the physical VIC adapter in the debug shell.

Conditions: This was specifically seen in an NSX-T topology though more general use of GENEVE offloading in the hardware would likely show same behavior. The NSX-T TEP mac addresses should be ‘bound’ to a physical interface unless there is a topology change. In this circumstance, we observed the TEP macs rapidly moving from Fabric A to Fabric B and vice versa while the teaming/load balancing policy was set to Active/Active in ESXi and NSX. NSX-T uses BFD Control frames between hosts and BFD leverages GENEVE. When GENEVE Offloading is enabled in the VIC adapter policy, this causes some small number of these BFD frames to egress the wrong physical link which causes the unexpected mac move behavior on northbound devices.

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