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OpenStack Networks the Web-Scale Way - Scott Laffer, Cumulus Networks

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Audience Level
Beginner

Synopsis
Layer 2 versus Layer 3, MLAG, Spanning-Tree, switch mechanism drivers, overlays and routing-on-the-host — What scales and what does not? The underlying plumbing of an OpenStack network is something you’d rather not have to think about. This presentation examines the network architectures of web-scale and large enterprise OpenStack users and how those same efficiencies can be used in deployments of all sizes.

Speaker Bio:
Scott is a Member of Technical Staff at Cumulus Networks where he designs, supports and deploys web-scale technologies and architectures in enterprise networks globally. Prior to becoming a founding member of the Cumulus office in Australia, Scott started his career as a network administrator before joining Cisco Systems to support their data centre products.

OpenStack Australia Day Melbourne 2017
https://events.aptira.com/openstack-australia-day-melbourne-2017/

Published in: Technology
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OpenStack Networks the Web-Scale Way - Scott Laffer, Cumulus Networks

  1. 1. 1 June 1st, 2017 Scott Laffer | Cumulus Networks OpenStack Networks The Web-Scale Way
  2. 2. 2 Agenda Who are we? Why should you care about the network? Tenant networks – What choices are there? What do you need from your network? Demo
  3. 3. 3 Cumulus Networks Confidential 3 Cumulus Networks brings Web-Scale Networking to Enterprise Cloud Economical scalability With commodity hardware and a standardized Linux stack, achieving a lower TCO by up to 60% Network OS Open Hardware Apps Apps Apps 1 2 3 4Built for the automation age Standardized toolsets Choice and flexibility Making networking repeatable and consistent Easily enable Linux tools: automation, monitoring, analytics… 50+ hardware platforms, from 11 vendors, and 2 silicon BLACK BOX Arista Juniper Cisco CUSTOMER CHOICE Unlocking the vertical network stack to build the modern data center Cumulus Linux
  4. 4. 4 Why should you care about the network?
  5. 5. 5 ML2 Type Drivers What type of networking is used to separate tenants? Other Linux Bridge OvS VendorOther GRE VLAN VxLAN Core Plugin (ML2) Type Manager Type Driver Mechanism Manager Mechanism Driver Flat Type Driver All subnets in the same broadcast domain. Commonly used for provider networks with floating IP pools. VLAN Type Driver Every tenant network is assigned a unique VLAN. VXLAN Type Driver Every tenant network is assigned a unique VXLAN.
  6. 6. 6 ML2 Mechanism Drivers What devices are we configuring the networks on? Other Linux Bridge OvS VendorOther GRE VLAN VxLAN Core Plugin (ML2) Type Manager Type Driver Mechanism Manager Mechanism Driver Open vSwitch Dedicated network stack on compute node using both kernel and user space to provide VM connectivity. Linux Bridge Uses native Linux kernel networking on compute node to provide Layer 2 and Layer 3 connectivity. Switch Drivers Installed on network node to work with network switches.
  7. 7. 7 Compute: Linux Bridge with VLAN VMVM bridge - <>bridge - <> subinterface taptap subinterface 802.1q trunk 802.1q trunk 802.1q bond VMVM bridge - <>bridge - <> subinterface taptap tap tap taptap subinterface vRouter L3 Agent DHCP AgentDHCP Agent
  8. 8. 8 Network: Linux Bridge with VLAN Technologies Used: § MLAG between all layers Considerations: § VLAN Scale § New tenant networks PRE-PROVISION MANUAL SWITCH MECHANISM DRIVER § MLAG and STP scale SWITCH OVERHEADS § Complex switch upgrade and failure scenarios A time-tested and proven design common with many existing OpenStack deployments ML2 Pair
  9. 9. 9 Network: Linux Bridge with VLAN Technologies Used: § MLAG between compute and switch § IP routed Fabric VXLAN between network layers § Switch Mechanism Driver Hierarchical Port Binding Considerations: § Higher networking complexity MORE MOVING PARTS § MLAG Scale still of concern § VLAN and STP Scale concerns reduced Introduces scalable L3 features and removes some L2 concerns at the expense of complexity. ML2 Pair ECMP L2 L3
  10. 10. 10 Compute: Linux Bridge with VXLAN 3 5 6 2 1 4 VXLAN –> Tunnel IP Server1 Network Node 172.16.1.1 172.16.1.2 192.168.40.2192.168.40.3/24 VM br-<random> br-<random> br-external TAP VXLAN-2061 eth0 eth0 eth0 eth0 swp1 swp8 swp47 vRouter VXLAN-2061 Mgmt Network 203.0.113.1/24 203.0.113.2/24 1 1 2 1 1
  11. 11. 11 Network: Linux Bridge with VXLAN Technologies Used: § IP routed Fabric VXLAN between the hosts § Quagga routing daemon SAME PACKAGE FROM CUMULUS LINUX ENABLES UN NUMBERED ROUTING Considerations: § VXLAN Offload NICs NEED VXLAN AND TCP SEGMENTATION OFFLOADS Simple, flexible and incredibly scalable. The best overall solution for modern OpenStack and Docker deployments. L3 ECMP ECMP
  12. 12. 12 Unnumbered Routing – Simple DC Underlay OSPF/BGP Unnumbered § No more /30 or /31s § Simple configuration § Just define the interface § Traceroute still works router bgp 100 neighbor swp1 remote-as external neighbor swp2 remote-as external neighbor swp3 remote-as internal Plug-and-play Layer 3 networking right down to the host
  13. 13. 13 Compare the pair Challenge Layer 2 Layer 3 with Overlay BUM traffic handling Flood and learn over the network L2 Population with ARP suppression Network redundancy MLAG and STP Equal Cost Multi-Path Number of broadcast domains 4096 16.7 Million Multi-site Network L2 extension required L3 reachability between hosts Network switch involvement for new tenant network creation Switch mechanism driver. TOR port to host mappings. None Bandwidth loss on network switch failure 50% 1/N Gracefully remove network switch from fabric No Yes
  14. 14. 14 Demo Time
  15. 15. 15 Thank you! Visit us at cumulusnetworks.com or follow us @cumulusnetworks © 2017 Cumulus Networks. Cumulus Networks, the Cumulus Networks Logo, and Cumulus Linux are trademarks or registered trademarks of Cumulus Networks, Inc. or its affiliates in the U.S. and other countries. Other names may be trademarks of their respective owners. The registered trademark Linux® is used pursuant to a sublicense from LMI, the exclusive licensee of Linus Torvalds, owner of the mark on a world-wide basis.

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