Evolution of OverlayNetworkingVictor MorenoDistinguished Engineer, MarketingAugust 2012© 2010 Cisco and/or its affiliates....
• Why Overlay Networks?• Host & Network Overlays today• Hybrid Overlays• Benefits of the Overlay Control Plane• Summary: O...
Robust Underlay Network                                                         Flexible Overlay Network• High Capacity Re...
IP1                                      Overlays enable the creation of virtual Segments                                 ...
VM                                                                                                                   Virtu...
IP1                                                                                                                       ...
IP Backbone• Hypervisors introduce an additional tier in the  network: The virtual Access (virtual Switch)• VMs connect to...
Flood/glean assumes single attached sites                  • Loop resolution• Pure virtual environments• Rely on data plan...
• Network Database to enable:• Unified service chaining (virtual + physical)   On physical and virtual switches, hosts, an...
• A mapping database (e.g. LISP) enables network programmability                   Traffic Engineering                   P...
Inter-DC and Intra-DC – LISP Protocol + Any encapsulation                    Virtual and Physical Hosts                   ...
Network Overlays                                         Host Overlays                    Hybrid Overlays                 ...
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The Future of Network Overlays for Virtualization

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  • Overlays are fundamental to providing a flexible networking environment capable of accommodating the mobility, scale and programmability that virtualized compute infrastructures demand. In this theatre presentation we will discuss Cisco's approach to Overlay Networking, discuss the roles and synergies of leading technology propositions being driven in the standards bodies such as VXLAN and LISP and review the readiness of the different product categories in the industry.
  • Show VXLAN localizedShow the different protocolsShow end-to-end segment-idFabric Path for layer 2 domain streamliningOTV for LAN extensions with domain isolationLISP for optimized IP mobilityVxLAN enhances networking for Virtual Elements: Segmentation (24 bits) + central management (vCenter)
  • The Future of Network Overlays for Virtualization

    1. 1. Evolution of OverlayNetworkingVictor MorenoDistinguished Engineer, MarketingAugust 2012© 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 1
    2. 2. • Why Overlay Networks?• Host & Network Overlays today• Hybrid Overlays• Benefits of the Overlay Control Plane• Summary: Overlay evolution in the Data Center© 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 2
    3. 3. Robust Underlay Network Flexible Overlay Network• High Capacity Resilient Fabric • Mobility – Track end-point attach at edges• Intelligent Packet Handling • Scale – Reduce core state Distribute and partition state to network edge• Programmable • Flexibility/Programmability Reduced number of touch points Seek well integrated best in class Overlays and Underlays© 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 3
    4. 4. IP1 Overlays enable the creation of virtual Segments GWY IP1 • Small Segments vxlan 1 GWY • Mobile: Can be instantiated anywhere VM web vxlan 21 vxlan 2 Move along with VMs as necessary VM app VM web VSG • Very large number of segments vxlan 22 Do not consume resources in the network core VSG appvxlan 3 VM db VM • Host overlays are initiated at the hypervisor vxlan 23 virtual switch  Virtual hosts only db VM • GWY to connect to the non-virtualized worldMulti-tier Virtual App = VMs + Segments + GWY • VXLAN shipping since 2011 on Cisco Nexus 1000v, other variants: NVGRE, STT© 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 4
    5. 5. VM Virtual Hosts OS• Enable IP mobility and Segmentation Today• Across L3 boundaries and organizations (without LAN extensions) Physical Hosts• Overlay Initiated at the physical switching infrastructure Service physical hosts (as well as virtual hosts)• LISP host mobility shipping on Nexus 7000, ISRs, ASR1K since early 2011 LISP IP mobility IP Network DC-west DC-east POD POD POD POD VM VM VM OS OS OS© 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 5
    6. 6. IP1 GWY vxlan 1 web VM vxlan 2• Move virtual Applications (vApps) to private cloud PODs VSG app VM Move VMs and virtual Segments (VXLANs) vxlan 3• LISP host mobility allows the vApp GWY to roam db VM Maintain GWY IP address, segmentation and optimal reachabilityBut … how to integrate physical and virtual into one simple solution?  Must evolve to a hybrid overlay LISP IP mobility IP Network DC-west DC-east POD POD POD POD GWY GWY GWY vxlan 1 GWY GWY vxlan 1 VM vxlan 1 vxlan 1 vxlan 1 web VM vxlan 2 web VM vxlan 2 VM VM web vxlan 2 web vxlan 2 web vxlan 2 VM app VM vxlan 3 app VM vxlan 3 VM VM app vxlan 3 app vxlan 3 app vxlan 3 VM db VM db© 2010 Cisco and/or its affiliates. All rights reserved. db VM db VM db VM Cisco Confidential 6
    7. 7. IP Backbone• Hypervisors introduce an additional tier in the network: The virtual Access (virtual Switch)• VMs connect to the virtual Access Core• Physical hosts connect to the physical Access• Host overlays start at the virtual Access Aggregation• Network overlays start at the physical Access Access• A hybrid overlay allows the combination of physical and virtual resources Virtual Access VM VM Hosts OS OSThe control plane of host overlays must evolve inorder to do this successfully Virtual Physical
    8. 8. Flood/glean assumes single attached sites • Loop resolution• Pure virtual environments• Rely on data plane information Core ✗Physical overlays involve network resiliency • Multi-pathing• Data plane information not sufficient CoreA control plane is required to provide:• Loop resolution • Broadcast de-duplication• Multi-pathing ✗ Core ✗• Broadcast de-duplication© 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 8
    9. 9. • Network Database to enable:• Unified service chaining (virtual + physical) On physical and virtual switches, hosts, and service nodes• DDoS traffic redirection IP Network DC-West DC-East L3 Fabric L3 Fabric L3 Fabric LISP Overlay App App OS OS vSG vWAAS WAAS Virtual DC Physical DC© 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 9
    10. 10. • A mapping database (e.g. LISP) enables network programmability Traffic Engineering Policy enforcement Big data analytics with per-application data e.g. geo-location Mapping System hosts Programmability Addressing, Routing, Traffic Engineering and Service Chaining profiles GWY GWY GWY vxlan 1 vxlan 1 vxlan 1 VM VM webVM web web vxlan 2 vxlan 2 vxlan 2 VM VM app app VM vxlan 3 app vxlan 3 vxlan 3 VM VM db VM db db© 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 10
    11. 11. Inter-DC and Intra-DC – LISP Protocol + Any encapsulation Virtual and Physical Hosts Layer 2 and Layer 3 Internet Scale Federated Network DB Private Network IP Network DB DC-west LISP DC-east IP mobility POD POD POD POD App App App App OS OS OS OS Normalized encapsulation VXLAN encapsulation NVGRE (or other) Encapsulation Normalization GWY Normalization GWY© 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 11
    12. 12. Network Overlays Host Overlays Hybrid Overlays Protocols Flooding Network DB V V V V M M M App App M O O O O S S O O S S S S Physical Physical Virtual Virtual Virtual Physical• Router/switch end-points • Virtual end-points only • Physical and Virtual• Protocols for resiliency/loops • Single admin domain • Resiliency + Scale• Traditional VPNs • VXLAN, NVGRE, STT • x-organizations/federation• OTV, VPLS, LISP • Open Standards © 2010 Cisco and/or its affiliates. All rights reserved. Cisco Confidential 12 Tunnel End-points
    13. 13. Thank you.
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