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Agile Networking with OpenStack

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OpenStack Summit - Hong Kong 2013

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Agile Networking with OpenStack

  1. 1. • Moderator – Chris Marino, Cisco • Panelists – Nick Barcet, eNovance – Rohit Agarwalla, Cisco – Somik Behera, VMware – Rudra Rugge, Juniper © 2013 Cisco and/or its affiliates. All rights reserved. 1
  2. 2. • Elements very rudimentary • Configured directly by tenant – – – – Networks Subnets Routers Services • Requirements drive complexity – – – – Scalable Multi-tenancy Tenant/app isolation Topology/Service Insertion Security © 2013 Cisco and/or its affiliates. All rights reserved. 2
  3. 3. • Nova Networking – Flat, Flat/DHCP • Bridge VMs out to physical network – VLAN networking • Isolated tenant virtual network • Gateway to physical L3 • Neutron Network Service – Nova style networks – Overlay Networks • Variety of overlay choices: VXLAN, GRE, STT, NVGRE – Layer 3 Services – Provider Networks • Simple way to attach to existing VLANs © 2013 Cisco and/or its affiliates. All rights reserved. 3
  4. 4. • Web service/on-line property or Large site, single-tenant – One giant app. Other smaller supporting apps. DevOps team • Enterprise, single DC private cloud. – A few dozen apps, 50% virtualized • Large Enterprise IT – Hundreds of apps, dozens of BUs with dev teams – Multi-DC private cloud • Cloud SP – Public IaaS, VPC Offering, etc. © 2013 Cisco and/or its affiliates. All rights reserved. 4
  5. 5. OpenStack Networking Deployment Models Number of Tenants Number of Hosts Networking Model OpenStack Module Technology Comments W/S None/One Any Flat, Provider Networks Nova-network or Neutron Linux Bridge, Physical Network Really simple, fast. Best for lots of N/S traffic. Ent Less than 4K 1-2 racks Isolated Tenant VLANs Nova-network or Neutron OVS, Trunked VLANs Simple, fast. Limited Ent Less than 4K 1-2 racks VLANs w/L3 Services Neutron +Host-based Agents Software possible bottleneck. Service Insertion TBD Ent Less than 4K 1-2 racks VLANs w/L3 Services Neutron +Top of Rack Fast, Familiar. Routable but L3 Services TBD IT More than 4K Tens Switched Overlay Neutron Trunked VLANs w/Tunnels Not Simple. Host Scalability Issues (STP). IT More than 4K Hundreds Fabric Overlay Neutron IP Fabric w/Tunnels Single DC, Fabric Controller needed IT, CSP More than 4K Thousands Fabric Overlay Neutron IP Fabric w/Tunnels, +BGP, +MPLS Multi-zone, Hybrid/ Cloud SP, Fabric Controller needed © 2013 Cisco and/or its affiliates. All rights reserved. 5
  6. 6. 1. Nicholas: How do you advise customers when they have to make these choices? 2. Rohit: Integrating into physical infra is always necessary, if you’ve using a switched/VLAN model, what alternatives exist for accessing physical network? 3. Somik: What would you say to someone that didn’t need 4K tenants about taking on an overlay-based networking model? 4. Rudra: Can BGP/MPLS-VPN help in single data center solutions. © 2013 Cisco and/or its affiliates. All rights reserved. 6

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