vSphere Networking Challenges and Solutions
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vSphere Networking Challenges and SolutionsHow VMware vSphere is shaping thedirection of the networking industry
Scott Lowe, VCDX 39 / CTO, VMware Affinity Team, EMCvExpert, Author, Blogger, Geek
http://blog.scottlowe.org / Twitter: @scott_lowe
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Before we start
• Get involved!
• Ask questions—this is your time and I want you to get the most out of it
• If you use Twitter, feel free to tweet about today’s session (use hashtag #NMVMUG)
• This presentation will be made available online after the event
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• Setting the stage
• Traffic consolidation
• Network management and troubleshooting
• VLANs and expanding L2 domains
• Stretched VLANs
• Multi-tenancy and increased scale
Agenda
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• The introduction of server virtualization into the data center is changing the face of data center networking
• While server virtualization provides a great number of benefits, it also introduces some challenges
• These challenges are apparent in a number of areas, including networking
• So what are the challenges, and how is the industry responding?
Setting the Stage
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• There are now multiple OS instances and multiple traffic types contending for bandwidth
• There is new virtualization-specific traffic (vMotion, FT)
• This requires new tools to help manage contention
• Network I/O Control (at the vSphere layer)
• QoS (at the network layer)
• Virtualization-integrated switching solutions (more on that in a bit)
Traffic Consolidation
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• Established network vendors are driving higher bandwidth standards (40 GE and 100 GE products recently introduced)
• Some new and upcoming vendors are using alternate technologies (consider Xsigo’s use of InfiniBand, for example)
Traffic Consolidation (continued)
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• Movement of the access layer into the hypervisor means a loss of visibility, control, and (in some cases) functionality
• VMware has added functionality to distributed vSwitches to help with some of this (NetFlow, port mirroring)
• Other solutions exist
• Hypervisor bypass (think Cisco VIC, SR-IOV)
• More full-featured virtual switch (think Nexus 1000V)
Network Management and Troubleshooting
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• Physical systems now need access to multiple VLANs
• VLANs must be provisioned to every physical host that might run a workload on that VLAN
• Required in order to support vMotion
• This results in very large L2 (broadcast) domains
• Large L2 domains generally not recommended by network architects
VLANs and Expanding L2 Domains
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• Some switch vendors address this through vCenter integration and dynamic VLAN pruning
• In the long term, new technologies are being developed
• An example is Edge Virtual Bridging (EVB), standardized as 802.1Qbg
• EVB allows VLANs to be provisioned (and deprovisioned) dynamically as needed
VLANs and Expanding L2 Domains (continued)
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• The desire to do long-distance vMotion means L2 domains stretched over distance
• A variety of technologies exist to enable stretched VLANs:
• Ethernet over MPLS (EoMPLS)
• Overlay Transport Virtualization (OTV)
• Virtual Private LAN Service (VPLS)
• Stretched VLANs also affect Layer 3 routing behaviors, driving the need for technologies like LISP
Stretched VLANs
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• The 12-bit VLAN address space isn’t big enough
• Hybrid cloud solutions means individual customers need to be properly separated and segregated
• This drives the development of new protocols
• Virtual eXtensible Local Area Network (VXLAN)
• Network Virtualization using Generic Routing Encapsulation (NVGRE)
• Stateless Transport Tunneling (STT)
Multi-Tenancy and Increased Scale
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Questions &Answers
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Thank You