Overlay Virtual Networking

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11:34 Introduction

This section describes the typical IaaS networking requirements:

  • Multiple tenants sharing the same infrastructure;
  • Multiple virtual networks (or routing domains) per tenant;
  • Elastic and scalable solution architecture.
Requirements 11:34 2013-10-18

44:53 Overlay Virtual Networking Overview

Traditionally we used VLANs to create multiple tenant networks... and hit numerous scalability limitations, resulting in most virtualization vendors embracing overlay virtual networks.

This section describes typical overlay virtual networking functionality, various encapsulation technologies, and interfaces between overlay networks and physical world.

The Need for Overlay Virtual Networks 10:31 2013-10-18
Overlay Virtual Networks 101 10:50 2013-10-18
Gateways and Virtual Appliances 23:32 2013-10-18

1:17:48 Packet Flows

Mastered the fundamentals? Let’s do a deep dive into how layer-2 forwarding, gateways, and distributed layer-3 forwarding work in overlay virtual networks.

Layer-2 Overlay Virtual Subnets 11:38 2014-06-05
Layer-2 MAC Learning and Flooding 15:42 2014-06-05
Layer-2 Gateways 9:24 2014-06-11
Layer-3 Gateways 4:36 2014-06-05
Distributed Layer-3 Forwarding 12:32 2014-06-05
Layer-3 Overlay Virtual Networks 18:01 2014-06-11
Conclusions and Questions 5:55 2014-06-11

1:01:58 Vendor Implementations

This section describes typical overlay virtual networking implementations, from using VXLAN on ToR switches to virtual networks implemented in hypervisors.

This part of the webinar has been recorded in 2014. In the meantime:

  • Most vendors started using unicast VXLAN with ingress replication;
  • Most ToR switches support EVPN as the control plane;
  • VMware NSX MH (NVP= has been replaced by completely redesigned NSX-T;
  • Midokura open-sourced their product and completely changed their architecture;
  • OpenStack got ML2 plugin. Most vendors reimplemented their plugins as ML2 drivers.
Vendor Implementations 2:09 2013-10-18
VXLAN 17:19 2013-10-18
VMware NSX 11:42 2013-10-25
VMware NSX for vSphere 5:38 2013-10-25
Hyper-V Network Virtualization 11:44 2013-10-25
Midokura Midonet 5:06 2013-10-25
IBM SDN VE 3:56 2013-10-25
OpenStack 4:24 2013-10-25

7:00 Recommendations and Conclusions

Recommendations and Conclusions 7:00 2013-10-25

Slide Decks

Overlay Virtual Networking 12M 2013-08-27
Following Packets across Overlay Virtual Networks 3.7M 2014-04-15

Public Presentations

Overlay Virtual Networking Explained - PLNOG11 6.7M 2018-02-04

Webinar description

This vendor-agnostic webinar briefly revisits the networking needs of server virtualization and IaaS cloud computing and describe the benefits and drawbacks of overlay virtual networks as compared to traditional VLAN-based solutions(including VM-aware networking technologies like 802.1Qbg). The second half of the webinar focuses on architectural and scalability aspects of individual solutions from major virtualization vendors (Cisco, VMware, Microsoft), emerging solutions (IBM SDN VE) and startups (Midokura), and open-source alternatives (OpenStack).
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