Datacenter Network Virtualization in Multi-Tenant Environments

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1 Chair for Network Architectures and Services Technische Universität München Datacenter Network Virtualization in Multi-Tenant Environments 8. DFN-Forum Kommunikationstechnologien Viktor Goldberg, Leibniz-Rechenzentrum, TU München Florian Wohlfart, TU München Daniel Raumer, TU München

2 Network Functions Virtualization Applications COMPUTE VIRTUALIZATION LAYER DECOUPLED x86 Hardware Viktor Goldberg 2

3 Network Functions Virtualization Viktor Goldberg 3

4 Building the Network Virtualized Datacenter Overlay Network Architecture Viktor Goldberg 4

5 Network Virtualization Overlays VXLAN - How does it work? VXLAN creates logical L2 domains over standard L3 infrastructure. VM traffic encapsulated inside a UDP/IP frame plus VNI identifier VNI defines the L2 domain encapsulation performed by a VTEP node VTEP is a software or physical switch (at the ToR) Encapsulated frames are routed to the remote VTEP. remote VTEP strips the IP/UDP header forwards original frame to the local VM transparent to the network core, not aware of the VXLAN overlay only edge VTEP nodes need to be VXLAN aware Viktor Goldberg 5

6 Open vswitch (OVS) Design and Architecture datapath running in kernel fastpath controller running in userspace slowpath Data Plane Control Plane Viktor Goldberg 6

7 Open vswitch (OVS) A Deep Dive Viktor Goldberg 7

8 KERNEL Open vswitch (OVS) A Deep Dive Viktor Goldberg 7

9 KERNEL Open vswitch (OVS) A Deep Dive Datapath Viktor Goldberg 7

10 KERNEL Open vswitch (OVS) A Deep Dive Datapath Viktor Goldberg 7

11 KERNEL Open vswitch (OVS) A Deep Dive Datapath Viktor Goldberg 7

12 KERNEL Open vswitch (OVS) A Deep Dive Datapath Viktor Goldberg 7

13 KERNEL USERSPACE Open vswitch (OVS) A Deep Dive vswitchd Datapath Viktor Goldberg 7

14 KERNEL USERSPACE Open vswitch (OVS) A Deep Dive vswitchd ovsdb-srv Datapath Viktor Goldberg 7

15 KERNEL USERSPACE Open vswitch (OVS) A Deep Dive OpenFlow vswitchd ovsdb-srv Datapath Viktor Goldberg 7

16 KERNEL USERSPACE Open vswitch (OVS) A Deep Dive OpenFlow vswitchd ovsdb-srv Datapath Viktor Goldberg 7

17 KERNEL USERSPACE Open vswitch (OVS) A Deep Dive OpenFlow vswitchd ovsdb-srv Datapath Viktor Goldberg 7

18 KERNEL USERSPACE Open vswitch (OVS) A Deep Dive OpenFlow vswitchd ovsdb-srv Datapath Viktor Goldberg 7

19 KERNEL USERSPACE Open vswitch (OVS) A Deep Dive OpenFlow vswitchd ovsdb-srv Datapath Viktor Goldberg 7

20 KERNEL USERSPACE Open vswitch (OVS) A Deep Dive OpenFlow vswitchd ovsdb-srv Datapath Viktor Goldberg 7

21 KERNEL USERSPACE Open vswitch (OVS) A Deep Dive OpenFlow vswitchd ovsdb-srv Datapath Viktor Goldberg 7

22 KERNEL USERSPACE MGMT Open vswitch (OVS) A Deep Dive OpenFlow vswitchd ovsdb-srv Datapath Viktor Goldberg 7

23 KERNEL USERSPACE MGMT Open vswitch (OVS) A Deep Dive ovs-ofctl ovs-dpctl OpenFlow ovsdb-tool ovs-vsctl vswitchd ovsdb-srv Datapath Viktor Goldberg 7

24 KERNEL USERSPACE MGMT Open vswitch (OVS) A Deep Dive ovs-ofctl ovs-dpctl OpenFlow ovsdb-tool ovs-vsctl vswitchd ovsdb-srv Datapath Viktor Goldberg 7

25 Building the Network Virtualized Datacenter Physical Infrastructure routed traffic at the top of rack proven and trusted protocol for scale mature open standards for interoperability standard scalable model for virtualized and non-virtualized solutions minimized size of the L2 domain no VLAN scaling issues Viktor Goldberg 8

26 Building the Network Virtualized Datacenter Scaling an L3 network for East to West traffic Viktor Goldberg 9

27 Network Virtualization Overlays Mininet an instant virtual network on your laptop running real kernel, switch and application code in a VM supports Open vswitch Motivation multi-tenant environment with two tenants T1 and T2 overlapping IP networks and addresses completly transparent tunneling, even broadcast traffic (like ARP, DHCP) Viktor Goldberg 10

28 Network Virtualization Overlays Viktor Goldberg 11

29 Network Virtualization Overlays Mininet VM Mininet VM Viktor Goldberg 11

30 Network Virtualization Overlays Mininet VM DEMOSYS1 IP: Mininet VM DEMOSYS2 IP: Viktor Goldberg 11

31 Network Virtualization Overlays Mininet VM DEMOSYS1 IP: Mininet VM DEMOSYS2 IP: Viktor Goldberg 11

32 Network Virtualization Overlays Mininet VM DEMOSYS1 IP: Mininet VM DEMOSYS2 IP: :00:00:00:00:01 00:00:00:00:00: Viktor Goldberg 11

33 Network Virtualization Overlays Mininet VM DEMOSYS1 IP: Mininet VM DEMOSYS2 IP: :00:00:00:00:01 00:00:00:00:00:02 00:00:00:00:00:01 00:00:00:00:00: Viktor Goldberg 11

34 Network Virtualization Overlays Mininet VM DEMOSYS1 IP: Mininet VM DEMOSYS2 IP: :00:00:00:00:01 00:00:00:00:00:02 00:00:00:00:00:01 00:00:00:00:00: Viktor Goldberg 11

35 Network Virtualization Overlays Mininet VM DEMOSYS1 IP: Mininet VM DEMOSYS2 IP: :00:00:00:00: :00:00:00:00:02 00:00:00:00:00: :00:00:00:00: Viktor Goldberg 11

36 Network Virtualization Overlays Demo - Interface Configuration S sh ovs-vsctl add-port s1 vtep -- set interface vtep type=vxlan option:remote_ip= option:key=flow ofport_request=10 S sh ovs-vsctl add-port s2 vtep -- set interface vtep type=vxlan option:remote_ip= option:key=flow ofport_request= Viktor Goldberg 12

37 Network Virtualization Overlays Demo - Flow configuration excerpt flows1.txt table=0,in_port=1,actions=set_field:10->tun_id,resubmit(,1) table=0,in_port=2,actions=set_field:20->tun_id,resubmit(,1) table=0,actions=resubmit(,1) table=1,tun_id=10,dl_dst=00:00:00:00:00:01,actions=output:1 table=1,tun_id=20,dl_dst=00:00:00:00:00:01,actions=output:2 table=1,tun_id=10,dl_dst=00:00:00:00:00:02,actions=output:10 table=1,tun_id=20,dl_dst=00:00:00:00:00:02,actions=output: Viktor Goldberg 13

38 Network Virtualization Overlays Demo Viktor Goldberg 14

39 Network Virtualization Overlays Demo Setup VXLAN Tunneling T1_1 ping T2_1 ping tcpdump i eth0 [icmp type {0,8}] tcpdump i eth0 [icmp type {0,8}] tcpdump i eth0 [icmp type {0,8}] Viktor Goldberg 15

40 Conclusion simple design of physical environment to provide IP end-to-end connectivity only logic should be placed into Intelligent Edges, ToR switches like OVS logical tenant separation through VXLAN tunneling technologies Future Work identification of services and tenants with specific needs deployment of a test environment long term goal: NFV rollout and optimization of physical underlay Viktor Goldberg 16

41 Chair for Network Architectures and Services Technische Universität München Thank You. Questions? Viktor Goldberg 17

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