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Module 3 : Cloud Optimized Networking in Windows Server 2012 R2

Module 3 : Cloud Optimized Networking in Windows Server 2012 R2. Rick Claus Microsoft Sr. Technical Evangelist Corey Hynes Lead Technical Architect, holSystems. Jump Start Target Agenda. Cloud Optimized Networking in Windows Server 2012 R2. Talk with our Experts in Chat tool.

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Module 3 : Cloud Optimized Networking in Windows Server 2012 R2

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  1. Module 3: Cloud Optimized Networking in Windows Server 2012 R2 Rick Claus Microsoft Sr. Technical Evangelist Corey Hynes Lead Technical Architect, holSystems

  2. Jump Start Target Agenda • Cloud Optimized Networking in Windows Server 2012 R2

  3. Talk with our Experts in Chat tool. #WS2012R2JS Hands-On Labs DOWNLOAD System Center 2012 R2 Preview aka.ms/sc2012r2 DOWNLOAD Windows Server 2012 R2 Preview aka.ms/ws2012r2 http://www.microsoftvirtualacademy.com System Center 2012 R2 Jumpstart July 15th - http://aka.ms/SCR2JS

  4. Scenario summary Simplifying Datacenter Network management Networking in the Hybrid Cloud Advancing Software Defined Networking Delivering Continuously Available Applications Improving Network Performance

  5. Just the facts Advancing Software Defined Networking Improving Network Performance Simplifying Datacenter Network Management Networking in the Hybrid Cloud Hyper-V Network Virtualization Hyper-V Extensible Switch SMB Direct (RDMA) IP Address Management (IPAM) Cross premise connectivity vRSS Microsoft Windows PowerShell Extending to Azure Inbox HNV Gateway Virtual Machine Manager Enhancements Single Root I/O Virtualization (SR-IOV) Remote Live capture Extending to Service Providers Delivering Continuously Available Applications SMB Multichannel DHCP Failover Dynamic VMQ Network Management using Virtual Machine Manager Quality of Service NIC Teaming Network Monitoring using Operations Manager 5

  6. Advancing Software Defined Networking Advancing Software Defined Networking Open, Extensible and Standards based • Hyper-V Network Virtualization • Inbox Gateway Built-in and production ready Hyper-V Extensible Switch Management with System Center Virtual Machine Manager Innovation in software and hardware

  7. Advancing Software Defined Networking Customer problems with networking • BACKGROUND • Network virtualization lags behind compute and storage • Administration within the data center may be soiled • THE CHALLENGES • Physical network configuration is not flexible • Workloads tied to underlying hardware configurations • Configuration changes are manual and cumbersome • Diverse network infrastructure requires vendor-specific management and control • Greater VM mobility and density difficult to achieve VLAN tags Aggregation Switches ToR ToR VMs

  8. Advancing Software Defined Networking What is Software Defined Networking? Abstracting Workloads Integrating Policies Controlling Traffic

  9. Advancing Software Defined Networking Hyper-V Extensible Switch Virtual Machine Virtual Machine • Extends virtual switch functionality by adding switch extensions • Provides open platform supporting third-party plug-ins to add functionality • Lets customers manage virtual network the same way they would manage a physical network • Helps monitor the security of virtual machine to virtual machine traffic • Provides unified management and enforcement of plug-ins with Virtual Machine Manager across entire datacenter • Includes NDIS filter drivers, WFP callout drivers, Ingress filtering, Destination lookup and forwarding and Egress filtering extensions Parent Partition VM NIC Host NIC VM NIC Extension Protocol Virtual Switch Capture Extensions Extension A Filtering Extensions Extension C Forwarding Extension Extension D Extension Miniport Physical NIC Hyper-V Extensible Switch architecture Integrating Policies Abstracting Workloads Controlling Traffic

  10. Advancing Software Defined Networking Extending the Extensible Switch Virtual Machine Virtual Machine Build Extensions for Capturing, Filtering & Forwarding • Key Features • Extension monitoring & uniqueness • Extensions that learn VM life cycle • Extensions that can veto state changes • Multiple extensions on same switch • Several Partner Solutions Available • Cisco – Nexus 1000V & UCS-VMFEX • NEC – ProgrammableFlow PF1000 • 5nine – Security Manager • InMon - SFlow Parent Partition VM NIC Host NIC VM NIC Extension Protocol Virtual Switch Capture Extensions Extension A Extension C Filtering Extensions Forwarding Extension Extension D Extension Miniport Physical NIC Hyper-V Extensible Switch architecture Integrating Policies Abstracting Workloads Controlling Traffic

  11. Advancing Software Defined Networking Abstracting workloads with Hyper-V Network Virtualization • How network virtualization works • Overlays multiple virtual networks on shared physical network • Uses industry standard General Routing Encapsulation (NVGRE) protocol Blue network Yellow network Blue virtual machine Yellow virtual machine • Problems solved • Creates VM mobility across datacenter, hoster cloud or Azure without network constraints • Provides ability to import customer IP addresses and network topology • Helps remove VLAN constraints • Helps eliminate hierarchical IP address assignment for virtual machines VIRTUALIZATION Physical server Physical network Integrating Policies Controlling Traffic Abstracting Workloads

  12. Advancing Software Defined Networking Hyper-V Network Virtualization • Tenants with overlapping IP Address range share same physical network • Policies enforced at host level using PowerShell or System Center Virtual Machine Manager • DHCP servers can be part of virtualized network to enable locally assigned IP addresses • Supports guest clustering 10.1.1.1 10.1.1.2 10.1.1.1 10.1.1.2 SQL Server Web Blue sees Orange sees SQL Server Web What’s really happening 192.168.n.n PROVIDER ADDRESS SPACE (PA) Hyper-V 1 Hyper-V 2 192.168.1.10 192.168.2.12 10.1.1.1 10.1.1.1 10.1.1.2 10.1.1.2 SQL Server SQL Server Web Web CUSTOMER ADDRESS SPACE Integrating Policies Controlling Traffic Abstracting Workloads

  13. Advancing Software Defined Networking Network Virtualization Packet Flow Where is 10.10.10.11? 10.10.10.10 Blue1 10.10.10.11 Blue2 VSID 5001 • Where is 10.10.10.11? • Blue1 sends ARP Packet to locate 10.10.10.11 • Hyper-V Switch broadcasts ARP on VSID 5001 • Hyper-V Switch then broadcasts ARP to the rest of the network, but intercepted by NV Filter • Note: ARP not broadcast on physical network • NV Filter checks its Policy Table and responds with Blue2 MAC • NV Filter sends ARP Response back into Hyper-V Switch and on to Blue1 VSID 5001 Network Virtualization Network Virtualization ARP TABLE 34:29:af:c7:d9:12 34:29:af:c7:d9:12 10.10.10.11 192.168.2.10 MACPA1 192.168.5.12 MACPA2 Integrating Policies Controlling Traffic Abstracting Workloads

  14. Advancing Software Defined Networking Network Virtualization Packet Flow Packet 10.10.10.10 Blue1 10.10.10.11 Blue2 Packet Packet Packet VSID VSID VSID Packet VSID 5001 VSID 5001 VSID Blue1 starts to construct its packet for Blue2 and sends it to the Hyper-V Switch Hyper-V Switch attaches the VSID GRE GRE Network Virtualization Network Virtualization NV Filter checks to see if Blue1 is allowed to contact Blue2, then constructs GRE Packet and sends it across the physical network On receiving host, opposite process takes place – NV Filter strips GRE, pulls out the VSID information, passes packet to Hyper-V Switch, where VSID removed and packet sent to Blue2 VM 192.168.2.10 MACPA1 192.168.5.12 MACPA2 Integrating Policies Controlling Traffic Abstracting Workloads

  15. Advancing Software Defined Networking Fabrikam Internet Contoso Multi-tenant VPN Gateway • Challenges • Hoster wants to provide isolated networks for tenant VMs with integral S2S VPN and NAT • Enterprises have virtualized networks split across different datacenters or virtualized networks (NVGRE aware) communicating to physical networks (NVGRE unaware) • Solution • Multi-tenant VPN gateway in Windows Server 2012 R2 Preview • Integral multitenant edge gateway for seamless connectivity • Guest clustering for high availability • BGP for dynamic routes update • Encaps/Decaps NVGRE packets • Multitenant aware NAT for Internet access Bridge Between VM Networks & Physical Networks DNS SQL DC SPS VPN SPS VPN Multi-tenant VPN Gateway Host Datacenter Network Virtualization Fabric Host Host Integrating Policies Controlling Traffic Abstracting Workloads

  16. Advancing Software Defined Networking Controlling Datacenter traffic flow • What it means: • Provides ability to control physical network hardware directly from applications • Enforces routing policies on the fly • Requires programmable hardware that uses a standard protocol like OpenFlow, Cisco OnePK and so on. • Challenges: • Adds complexity to the application • Creates challenges in heterogeneous environment • Is it production ready? • Applicable to certain classes of applications like Microsoft Lync, Network diagnostic tools, high fidelity video games • Most Line of Business applications and workloads may not need this level of control Aggregation Switches ToR ToR VM VM Application Application Integrating Policies Abstracting Workloads Controlling Traffic

  17. Advancing Software Defined Networking Managing SDN with System Center 2012 R2 Virtual Machine Manager • Challenges • Manage a large number of physical and virtual switches • Integrate management of physical and virtual networks • Solution • Logical Network • Organizes and simplifies network assignments for hosts, virtual machines and services • Integrated physical and virtual switch VLAN policy • VM Network • Creation/deletion of isolated virtual network overlay (HNV) on physical network Virtual VM Network VM Network Extension Extension Logical NW Extension VLAN 25 Subnet 10.0.0.0/26 Fabric Logical NW Physical Network Managing SDN

  18. Advancing Software Defined Networking Managing SDN with System Center 2012 R2 Virtual Machine Manager • Challenges • Allow seamless migration of VM while maintaining network policy • Solution • Logical Switch • Single logical entity spanning hosts • Consistent policy and configuration • Management of Hyper-V Extensible Switch • Installation and configuration of switch extensions • Configuration of network policies • Network policies automatically move with the VM • Includes 3rd party extensions Virtual VM Network VM Network Extension Extension Logical NW Extension VLAN 25 Subnet 10.0.0.0/26 Fabric Logical NW Physical Network Managing SDN

  19. How switch management works • Standards-based CIM model • Switches running Open Management Infrastructure (OMI) • Switch Management PowerShell Cmdlets Advancing Software Defined Networking Network switch management with OMI PowerShell CIM Cmdlets • Problems solved • Common management interface across multiple network vendors • Automate common network management tasks • Logo Program enables customers to find/buy switches that “just work” Communicating using WS-MAN OMI OMI OMI Managing SDN

  20. Advancing Software Defined Networking SDN partner ecosystem Gateway appliances Hyper-V switchextensions OMI-basedtop-of-rack switch Chipsetextensions

  21. Software Defined Networking Benefits • To Hosters To Enterprises To Private/Public Cloud Datacenter Admins To Workload Owners • Migrate workloads seamlessly across clouds • Preserve policies, VM settings, and IP addresses • Move from test to production with minimal network configuration • Reduce Opex related to networking • Simplify datacenter consolidation and mergers and acquisitions • Extend datacenter into hybrid cloud environment without specialized networking gear • Enables customers to bring their own IP addresses and DHCP servers • Realize scalable multi-tenancy • Simplify connectivity to customer datacenter • Provide flexible VM placement without reconfiguration • Decouple server and network admin roles to increase agility • Enforce unified policy across entire datacenter from a single management plane Integrating Policies Abstracting Workloads Controlling Traffic

  22. Delivering Continuously Available Applications Networking solutions that deliver continuous application availability • Provide consistent bandwidth for services NIC Teaming Quality of Service Run services without interruption DHCP failover SMB Multichannel • Embrace a multi-vendor ecosystem Automatically remediate issues with no human intervention

  23. Delivering Continuously Available Applications Network fault tolerance with SMB Multichannel • Automatic detection and use of multiple network connections between SMB client and server • Helps server applications be resilient to network failure • Transparent Failover with recovery of network failure if another connection is unavailable • Improved throughput • Bandwidth aggregation through NIC Teaming • Multiple nodes/CPUs for network processing with RSS-capable network adapters • Automatic configuration with very little administrative overhead SMB client SMB server Network NIC NIC File copy File copy NIC NIC

  24. Delivering Continuously Available Applications Highly Available DHCP Service • Automatic DHCP failover based on DHCP failover IETF spec • Provides multi-site IP address continuity to clients by helping eliminate single points of failure • Provides in-box support for failover, without the need for clustering • Uses a failover setup consisting of two servers located across different geographic locations • Includes active/active or active/passive behavior • Simple provisioning and configuration of DHCP server using PowerShell • Hot standby DHCP failover in a hub-and-spoke deployment • Load-sharing DHCP failover in a single site with a single subnet

  25. Delivering Continuously Available Applications Predictable performance with Quality of Service • Helps guarantee predictable network performance and fair sharing during congestion • Supports bandwidth floors and bandwidth caps • Helps enforce customer SLAs and maximum pricing caps • Sets QoS for virtual machine or traffic type • Uses software built into Windows Server 2012 R2 Preview or hardware capable of Data Center Bridging (DCB) to assign minimum QoS settings • Supports dynamic change of QoS settings through PowerShell without any downtime Actual bandwidth usage by service T1 T2 T3 4 3 2 6 4 5 2 2 1 0.5 When bandwidth is available, each service takes as much as it can When the link is congested, each service takes its fair share When bandwidth becomes available, each service takes as much as it wants

  26. Delivering Continuously Available Applications NIC Teaming • Provides network fault tolerance and continuous availability when network adapters fail by teaming multiple network interfaces • Supports all vendors in-box • Facilitates local or remote management through Windows PowerShell or UI • Enables teams of up to 32 network adapters • Aggregates bandwidth from multiple network adapters • Includes multiple nodes: switch dependent and independent Operating system Virtual adapters Virtual adapters Team network adapter Team network adapter NIC Teaming 8 x 1Gb NICs – 8Gb throughput

  27. Delivering Continuously Available Applications Dynamic NIC Teaming • TCP streams or "flows” are generally not continuous • Groups of packets sent between flows are called “flowlets” • Dynamic load balancing detects breaks in a flow of sufficient length to minimize possibility of packet reordering • Flows can be moved to other team members on flowlet boundaries to rebalance traffic • Dynamic LBFO maximizes resource utilization in teamed NICs by balancing loads across all NIC team members • Ideal when there are fewer VMs per team Operating system Virtual adapters Virtual adapters Team network adapter Team network adapter NIC Teaming Large TCP flow Flowlet Small TCP flow Flowlet (swaps NICs)

  28. Improving NetworkPerformance High-performance networking with current and next-generation hardware Help ensure that networking is no longer the bottleneck • Deliver high-speed data transfer on industry-standard hardware SR-IOV • vRSS • Scale automatically as demand increases Dynamic VMQ SMB Direct (RDMA) Gain predictable performance

  29. Improving NetworkPerformance Improved network performance through SMB Direct (RDMA) Without RDMA With RDMA • Higher performance through offloading of network I/O processing onto network adapter • Higher throughput with low latency and ability to take advantage of high-speed networks (such as InfiniBand and iWARP) • Remote storage at the speed of direct storage • Transfer rate of around 50 Gbps on a single NIC port • Compatible with SMB Multichannel for load balancing and failover File Client File Server Application Application App Buffer App Buffer SMB client SMB Client SMB Server SMB Server SMB Buffer SMB Buffer SMB Buffer SMB Buffer Transport Protocol Driver Transport Protocol Driver Transport Protocol Driver Transport Protocol Driver OS Buffer OS Buffer NIC Driver NIC Driver NIC Driver NIC Driver Driver Buffer Driver Buffer rNIC NIC NIC rNIC iWARP Adapter Buffer Adapter Buffer Adapter Buffer Adapter Buffer InfiniBand

  30. Improving NetworkPerformance Dynamic Virtual Machine Queue Increased efficiency of network processing on Hyper-V hosts • Without VMQ • Hyper-V Virtual Switch is responsible for routing & sorting packets for VMs • This leads to increased CPU processing, all focused on CPU0 • With VMQ • Physical NIC creates virtual network queues for each VM to reduce host CPU • With Dynamic VMQ • Processor cores dynamically allocated for a better spread of network traffic processing Hyper‑V Host Hyper‑V Host Hyper‑V Host CPU0 CPU1 CPU2 CPU3 CPU0 CPU1 CPU2 CPU3 CPU0 CPU1 CPU2 CPU3 Without VMQ With VMQ With DVMQ

  31. Improving NetworkPerformance Virtual RSS Virtual Machine vProc • vRSS provides near line rate to a VM on existing hardware, making it possible to virtualize traditionally network intensive physical workloads • Extends the RSS functionality built into Windows Server 2012 • Maximizes resource utilization by spreading VM traffic across multiple virtual processors • Helps virtualized systems reach higher speeds with 40 Gbps and 100 Gbps NICs • Requires no hardware upgrade and works with any NICs that support RSS With out vProc vRSS vProc vProc vNIC Node 2 Node 0 Node 1 Node 3 With out RSS 0 1 2 3 2 0 1 3 Incoming packets

  32. Improving NetworkPerformance Single Root I/O Virtualization (SR-IOV) • VM traffic bypasses virtual switch and performs I/O directly to NIC • Ideal for high I/O workloads that do not require port policies, QoS, or network virtualization enforced at the end host virtual switch • Most 10Gbps and in-box NICs SR-IOV capable • Benefits • Maximizes use of host system processors and memory • Reduces host CPU overhead for processing network traffic (by up to 50%) • Reduces network latency (by up to 50%) • Provides higher network throughput (by up to 30%) • Full support for Live Migration Host Virtual Machine VM Network Stack Virtual Function Synthetic NIC Hyper‑VExtensible Switch SR-IOV NIC VF VF VF Traffic Flow Traffic Flow

  33. Simplifying Datacenter Network Management Operational efficiency through simplified manageability Monitor resource usage IP Address Management Provide an easy-to-use, robust automation framework Resource Metering Monitoring with Operations Manager Simplify management in multisite environments Manage IP address space and consolidate external tools • Management with Virtual Machine Manager Windows PowerShell

  34. Simplifying Datacenter Network Management IP Address Management (IPAM) Domainfareast.corp.woodbridge.com • Inbox feature for integrated management of IP addresses, domain names, and device identities • Tightly integrates with Microsoft DNS and DHCP servers • Provides custom IP address space display, reporting, and management • Audits server configuration changes and tracks IP address use • Migrates IP address data from spreadsheets or other tools • Monitors and manages specific scenario-based DHCP and DNS services IPAM distributed architecture IPAM Server (Bangalore) DHCP, DNS, DC, and NPS servers Domaineurope.corp.woodbridge.com Domaincopr.woodbridge.com IPAM Server (Hyderabad) DHCP, DNS, DC, and NPS servers DHCP, DNS, DC, and NPS servers IPAM Server (UK) IPAM server (Redmond) • Site: UKBranch office DHCP, DNS, DC, and NPS servers • Site: RedmondHead office • Site: HyderabadBranch office • Site: BangaloreBranch office

  35. Simplifying Datacenter Network Management IP Address Management (IPAM) • Manages virtual address space in addition to physical address space • Imports and exports network configurations automatically through plugin for System Center Virtual Machine Manager • Enables synchronization of Active Directory Sites and subnets information with IPAM • Supports large scale enterprise deployments • Uses SQL Server to store IP address information • Lets admins define user roles, access scope and access policy through role-based access control Network Administrator Fabric Administrator System Administrator Forensics Investigator IPAM Client Win vNext WCF VMM Server SC vNext PS/WS Man MS SQL Server SQL 2008 R2, SQL 2012 Integration Plugin Role Based Access Control IPAM Server WS vNext Server Discovery Server Configuration Address Utilization Event Collection Server Availability Server Monitoring Address Expiry DHCP Server WS08 IPAM Administrator IPAM ASM Administrator IPAM MSM Administrator IPAM Users IPAM Audit Administrator Security Groups Data collection tasks DNS Server WS08 R2 & SPs DC Server WS8 NPS Server WS vNext

  36. Simplifying Datacenter Network Management Windows PowerShell Comprehensive coverage with more than 400 cmdlets related to networking Remote machine management support Integrated object model

  37. Simplifying Datacenter Network Management Resource Metering 20 15 25 5 55 5 10 15 20 25 40 35 45 50 30 30 10 0 0 Resource Pool Internet Resource Metering Benefits Metrics • Tracks and meters resource usage and provides infrastructure to build chargeback solutions • Tracks resource usage of individual virtual machines or virtual machine pools • Metering not affected by virtual machine movement • Uses active control lists (ACLs) from network metering port • Provides complete Windows PowerShell support • Average CPU use • Average memory use • Minimum memory use • Maximum memory use • Maximum disk allocation • Incoming network traffic • Outgoing network traffic • Storage IOPS Resource pool Internet Customer 1 Resource pool Internet Customer 2 VM 1 Customer 1 VM 2 Customer 1 VM 3 Customer 1 VM 1 Customer 2 VM 2 Customer 2 VM 3 Customer 2 45 30 20 0 25 10 40 0 Virtual Machine Resource Metering A two-tenant environment built with Hyper-V in Windows Server 2012 R2 Preview

  38. Simplifying Datacenter Network Management Remote Live Monitoring • Remote monitoring of network traffic on a in Windows Server 2012 is not simple • Windows Server 2012 R2 Preview makes it easy to mirror and capture network traffic for remote and local viewing • Provides integrated GUI experience with Message Analyzer • Collects offline traffic captures from remote computers • Provides filters to select packets by IP addresses and VMs • Captures ETW events for remote and local viewing Remote Live Monitoring provides remote packet and ETW event capture from any host in the datacenter, enabling low-touch diagnostics at high scale WMI to configure the filters and truncation WMI starts/stops the session Truncated network traffic redirected ETW events Windows Server 2012 R2 Server or client with Microsoft Message Analyzer

  39. Networking in Hybrid Cloud • Cross-premises connectivity Seamlessly extend Datacenter to Azure Inbox Gateway to extend beyond private cloud • Extending your private cloud to Azure Extending your private cloud to hosters

  40. Networking in the Hybrid Cloud Cross-premises connectivity • VPN site-to-site functionality in remote access: • Provides cross-premises connectivity between enterprises and hosting service providers • Connects to private subnets in hosted cloud networks • Provides connectivity among geographically separate enterprises Contoso London branch VPN site-to-site tunnel IKEv2-IPsec Subnet3 Contoso private cloud Contoso New York branch VPN site-to-site tunnel IKEv2-IPsec Subnet4 Woodgrove private cloud VPN site-to-site tunnel IKEv2-IPsec Woodgrove Brazilian branch Hosted Cloud Industry standard IKEv2-IPsec router Windows Server 2012 R2 Preview remote access site-to-site VPN server Subnet1 Subnet3 Subnet1 Subnet2 Subnet4 Subnet2

  41. Networking in the Hybrid Cloud Hybrid Networking in WS 2012 S2S Tunnel S2S Tunnel Blue Corp Site 1 • Includes Site-to-site (S2S) VPN as part of Remote Access Server • Requires Windows Network Virtualization • Needs one VM per tenant for the gateway Blue Virtual Network Blue Corp Site 2 S2S Tunnel Blue GW Green Virtual Network Green Corp Site S2S Tunnel Green GW S2S Tunnel Orange Corp site1 Orange Virtual Network Orange Corp site2 Orange GW Remote sites Internet Hoster’s datacenter

  42. Networking in the Hybrid Cloud Hybrid Networking in WS 2012 R2 S2S Tunnel Blue Corp Site 1 • Provides multitenant S2S gateway • Includes guest clustering for HA • Uses BGP for dynamic routes update • Provides multitenant-aware NAT for Internet access BGP Blue Virtual Network S2S Tunnel Blue Corp Site 2 S2S Tunnel Active-Standby S2S Tunnel Green Virtual Network S2S Tunnel Green Corp Site Multitenant GW Orange Corp site1 Orange Virtual Network Orange Corp site2 Remote sites Internet Hoster’s datacenter

  43. Networking in the Hybrid Cloud Connecting Private Cloud with Azure Virtual Network • Extend your datacenter to Azure by creating VMs in private networks • Connect individual computers to Azure VMs and virtual networks using Point to Site connectivity without VPN device • Windows inbox gateway to connect virtual networks in private cloud and Azure Site-to-Site VPN DNS Server Subnet 1 Subnet 2 Subnet 3 VPN Gateway On premises Your datacenter VPN Device VPN Device Individual computers behind corporate firewall Remote workers

  44. Get started Scenario summary Simplifying Datacenter Network management Networking in the Hybrid Cloud Advancing Software Defined Networking Delivering Continuously Available Applications Improving Network Performance

  45. Talk with our Experts in Chat tool. #WS2012R2JS Hands-On Labs DOWNLOAD System Center 2012 R2 Preview aka.ms/sc2012r2 DOWNLOAD Windows Server 2012 R2 Preview aka.ms/ws2012r2 http://www.microsoftvirtualacademy.com System Center 2012 R2 Jumpstart July 15th - http://aka.ms/SCR2JS

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