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Network Virtualization Meets the WAN
This document discusses network virtualization and how it can connect virtualized data centers to wide area networks (WANs). It introduces the concept of a network virtualization platform that abstracts physical network infrastructure and allows provisioning virtual networks and services in a programmatic way. It describes two options for mapping logical networks in a virtualized data center to tunnels in an MPLS WAN core: mapping them to VLANs or MPLS labels. The key role of the network virtualization gateway is to demarcate and map between tunneling formats within the data center and WAN.
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Network Virtualization Meets the WAN
- 1. 1 www.isocore.com/mpls2013 Data Center VirtualizationMeets the WAN Bruce Davie VMware bdavie@vmware.com
- 2. 2 Compute Virtualization AbstractionLayer Why we need network virtualization Physical Infrastructure • Provisioning is slow • Placement is limited • Mobility is limited • Hardware dependent • Operationally intensive Networking undoes much of the goodness of server virtualization
- 3. 3 The Solution –Virtualize the Network Physical Infrastructure Compute Virtualization Abstraction Layer • Programmatic provisioning • Place any workload anywhere • Move any workload anywhere • Decoupled from hardware • Operationally efficient Network Virtualization Abstraction Layer Software Defined Data Center • Provisioning is slow • Placement is limited • Mobility is limited • Hardware dependent • Operationally intensiveSOFTWARE-DEFINED DATACENTER SERVICES VDC
- 4. 4 What is NetworkVirtualization? Physical Compute & Memory Server Hypervisor Requirement: x86 Virtual Machine Virtual Machine Virtual Machine Application Application Application x86 Environment Physical Network Network Virtualization Platform Requirement: IP Transport Virtual Network Virtual Network Virtual Network Workload Workload Workload L2, L3, L4-7 Network Services Decoupled
- 5. 5 The Starting Pointfor Network Virtualization: Virtual Switch Hypervisor vSwitch Hypervisor vSwitch Physical Network
- 6. 6 VLAN L2 L3 Virtual Network L2 NSX Gateway NSX– A Network Virtualization Platform Physical Network vSphere Host vSphere Host KVM Xen Server NSX vSwitch NSX vSwitch Open vSwitch Open vSwitch Hardware Software Controller Cluster VLAN VTEP API HW Partner VM VM “NSX API” CMP
- 7. 7 IP/MPLS CORE Hypervisor Hypervisor Hypervisor NSX Gateway OpenvSwitch Open vSwitch Open vSwitch PE To Customer Sites Connecting Virtualized Data Centers to the WAN
- 8. 8 Option A: MapLogical Networks to VLANs NSX GatewayVRF VRF VRF Logical Networks map to VLANs; Each VLAN maps to a VRF (customer- specific routing table) PETo Customer Sites MPLS Core Virtualized DC
- 9. 9 Option B: MapLogical Networks to MPLS Labels NSX Gateway Logical Network Prefixes advertised in MP-BGP with MPLS labels ASBRTo Customer Sites MPLS Core Treat interface like inter-AS (RFC 4364) MPLS Labelled Packets mapped to/from logical networks Virtualized DC
- 10. 10 What’s the gatewaydoing? Mapping tunnel formats • Use VXLAN/NVGRE/STT in the datacenter, MPLS in the WAN Demarcation point between WAN services and DC services • In the WAN, L2 & L3 services are the norm • In the DC, rich L2-L7 services prevail • Self-service provisioning in the DC • Gateway is one end of the L2-L7 pipeline Reducing state requirements at the PE/ASBR • No need to terminate 1000s of tunnels to hypervisors • No per-hypervisor routes • No VRFs
- 11. 11 Summary Network virtualizationis about agility • Brings the operational model of server virtualization to networking • Provision complex topologies and services in software – enabling automation • Services decoupled from hardware Integration with MPLS WANs: • Treat data center edge as AS boundary • Retain richness of data center services • Self-service provisioning A fundamental shift in the networking landscape