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Home > Packet Pushers - Weekly Show > Show 256 – Design & Build 6 – VXLAN Use Cases
Podcast: Packet Pushers - Weekly Show
Episode:

Show 256 – Design & Build 6 – VXLAN Use Cases
Category: Technology
Duration: 00:00:00
Publish Date: 2015-09-25 11:36:25
Description:

There s a lot of talk in the industry about network virtualization. VXLAN is one of the encapsulation protocols you can use, and it’s the focus of today’s show.

We’ll discuss why you might want to virtualize your network, and why you’d use an overlay.

If you do go down this road, what are the design considerations you need to keep in mind as you put this system together? We ll talk about VXLAN use cases, pros and cons, and debate the finer technical points of L2/L3 data center networking.

Three guests join us to delve into VXLAN:

Anthony Burke, Senior Systems Engineer, Network and Security Business Unit, VMware. He blogs at Network Inferno.

Richard Alexander, solutions director for Logicalis UK. You can find him at CXOunplugged.

Lukas Krattiger, Technical Marketing Engineer, Cisco Systems

Show Notes:

Use Cases – Why does an organization add overlays to their network?

  • vMotion between DCs / L2 (contained in the overlay) vs L3 (unique address space between DCs)
  • Similar to above, preserving L2 adjacency between services
  • Allow mobility for apps
  • VXLAN is not for compute virtualization only
  • VXLAN is not DCI, but it helps

Components – What are the major elements for this solution?

  • It s just another overlay/encap type
  • Understanding the VNID
  • Rare that 802.1q 4096 isn t enough in enterprises
  • VTEPs
  • Multicast control plane by default (i.e. no control plane) for VTEPs to learn location of endpoints (aka Flood&Learn)

Design Considerations

-Routing protocols are built for transporting routed protocols, now we put Layer 2 overlays on top (new requirements)

-As Layer 2 has (mostly) multi-destination traffic, unicast alone might not be good enough

-Some key requirements for Layer 3 underlay (Unicast, Multicast)

  • Interface types
  • IPv4, IPv6
  • PIM ASM vs. BiDir and RP redundancy/load balancing

-Some key differentiators in regards to the Protocols (OSPF vs, IS-IS vs. EIGRP vs BGP)

-Differences between a Layer-3 Underlay vs. a Layer-3 Fabric (MSDCs)

-What if we put VXLAN on top?

  • Unicast and Multicast specifics for VXLAN
  • VTEP reachability
  • BUM traffic
  • Multicast vs. MP-BGP control plane for VXLAN

Links:

NSX for vSphere: VXLAN Control Plane modes explained – Dmitri Kalintsev

TCP/IP Over VXLAN Bandwidth Overheads – Steven Iveson

Show 233 Cisco Nexus Using BGP As A VXLAN Control Plane Sponsored – Packet Pushers

The post Show 256 – Design & Build 6 – VXLAN Use Cases appeared first on Packet Pushers.
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