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Software Defined Networks in
         CloudStack
         The Vision
Multi-site Deployment Architecture

                                                           MySQL
                                                         Replication           Secondary
                                                                              Mgmt Server
                                     Primary                                    Cluster
                                    MgmtServer
              Availability            Cluster
                Zone 1                                                 Data Center 2




          Data Center 1




                                                                                  Availability
                                                                                    Zone 2




        Availability                                                       Data Center 5
          Zone 4

                          Availability
                            Zone 5                      Availability
                                                          Zone 3

    Data Center 3

                                                 Data Center 4
Physical Network within One Availability Zone
                                                                       Public Internet


                                             Data Firewall /                                 Mgmt Firewall
                                             Load Balancer


                                                     Zone-Level Layer 3 Switch                                  Private Network




 Pod 1                                                               Pod 2                              Pod N
                  Pod-Level Layer-2 Switch
                                                                                         …
                                                                                                                      Scale-Out NFS
               Computing
                                        Primary
                Server 1
                                        Storage
   Cluster 2




               Computing
                Server 2                Primary
                                        Storage


               Computing
                Server 3
   Cluster 1




                                        Primary
                                        Storage
               Computing
                Server 4
Virtual Network overlay
                      Zone-Level Layer 3 Switch




   Public Network                                    Private Network
   (65.37.*.*,                                       (192.168.*.*, connections to
   billed to users)                                  Mgmt Server)

                      Pod-Level Layer-2 Switch




   65.37.*.*                                User 1
                             RServer 1
                             Computing
                                                              Storage


                              Computing
                               Server 2                       Storage


                              Computing
                               Server 3



                                      R
                              Computing
                               Server 4


                             Computing
                              Server 5
                                                  User 2
VLAN issues
• Virtual Network isolation (green for Tenant 1 and
  red for Tenant 2) realized using VLAN today
  – Tenant-specific VLAN can span pods
• Tenant can have multiple isolated virtual networks
  to realize multi-tier app
• VLAN = Big Problems
  – 4K VLANs = few hundreds of tenants
  – All switches have all 4K VLANs provisioned
     • See broadcast /multicast even if VLAN is not used.
  – Traffic Tromboning across DC
  – Cannot stretch multi-tier app across DC
AWS VPC




Large-scale production deployment of SDN
Open vSwitch (OVS)
• Multi-layer virtual switch supporting
  OpenFlow protocol
• High performance production quality
  replacement for Linux bridging code
• Default networking stack forXenServer 6.0
  onward
• DVS and layer-2 cloud networking supported
  via GRE tunnels
CloudStack + SDN
• Phase 1 (Demo in ONS/Synergy)
   – CloudStack will orchestrate GRE tunnels to replace VLANs
     (achieve scale)
   – Based on XS 6.0
   – CloudStack contains embedded OpenFlow controller (not really,
     but something like it)
   – Live Migration, Virtual Router, multi-tier apps
• Phase 2:
   –   KVM support
   –   NS VPX for LB, NAT
   –   Multi-hypervisor cloud
   –   Support External Controllers (BigSwitch)
        • BigSwitch will write the integration code

                           Take this with a grain of salt. Just a vision
                                           statement
CloudStack + SDN
• Phase 3
  – VXLAN alternative to GRE
     • Perhaps NS will have it by then
  – NVGRE support
• Phase 4
  – AWS VPC semantics and API equivalence

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3.5 SDN CloudStack Developer Day

  • 1. Software Defined Networks in CloudStack The Vision
  • 2. Multi-site Deployment Architecture MySQL Replication Secondary Mgmt Server Primary Cluster MgmtServer Availability Cluster Zone 1 Data Center 2 Data Center 1 Availability Zone 2 Availability Data Center 5 Zone 4 Availability Zone 5 Availability Zone 3 Data Center 3 Data Center 4
  • 3. Physical Network within One Availability Zone Public Internet Data Firewall / Mgmt Firewall Load Balancer Zone-Level Layer 3 Switch Private Network Pod 1 Pod 2 Pod N Pod-Level Layer-2 Switch … Scale-Out NFS Computing Primary Server 1 Storage Cluster 2 Computing Server 2 Primary Storage Computing Server 3 Cluster 1 Primary Storage Computing Server 4
  • 4. Virtual Network overlay Zone-Level Layer 3 Switch Public Network Private Network (65.37.*.*, (192.168.*.*, connections to billed to users) Mgmt Server) Pod-Level Layer-2 Switch 65.37.*.* User 1 RServer 1 Computing Storage Computing Server 2 Storage Computing Server 3 R Computing Server 4 Computing Server 5 User 2
  • 5. VLAN issues • Virtual Network isolation (green for Tenant 1 and red for Tenant 2) realized using VLAN today – Tenant-specific VLAN can span pods • Tenant can have multiple isolated virtual networks to realize multi-tier app • VLAN = Big Problems – 4K VLANs = few hundreds of tenants – All switches have all 4K VLANs provisioned • See broadcast /multicast even if VLAN is not used. – Traffic Tromboning across DC – Cannot stretch multi-tier app across DC
  • 6. AWS VPC Large-scale production deployment of SDN
  • 7. Open vSwitch (OVS) • Multi-layer virtual switch supporting OpenFlow protocol • High performance production quality replacement for Linux bridging code • Default networking stack forXenServer 6.0 onward • DVS and layer-2 cloud networking supported via GRE tunnels
  • 8. CloudStack + SDN • Phase 1 (Demo in ONS/Synergy) – CloudStack will orchestrate GRE tunnels to replace VLANs (achieve scale) – Based on XS 6.0 – CloudStack contains embedded OpenFlow controller (not really, but something like it) – Live Migration, Virtual Router, multi-tier apps • Phase 2: – KVM support – NS VPX for LB, NAT – Multi-hypervisor cloud – Support External Controllers (BigSwitch) • BigSwitch will write the integration code Take this with a grain of salt. Just a vision statement
  • 9. CloudStack + SDN • Phase 3 – VXLAN alternative to GRE • Perhaps NS will have it by then – NVGRE support • Phase 4 – AWS VPC semantics and API equivalence