Outline. Why Neutron? What is Neutron? API Abstractions Plugin Architecture

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1 OpenStack Neutron

2 Outline Why Neutron? What is Neutron? API Abstractions Plugin Architecture

3 Why Neutron?

4 Networks for Enterprise Applications are Complex. Image from windowssecurity.com

5 Why Neutron? Reason #1 On-demand Enterprise-Class Networking Neutron has Tenants API to: create multiple private L2 networks control IP addressing (can use same IP space as existing datacenter deployment) Connect to an upstream router for external access. Insert advanced network services: routers, firewalls, VPN, IDS, etc. Monitor network status L2 L2 L2 L2 Internet L3 L3 L3 L3

6 Why Neutron? #2: Leveraging Advanced Technologies New networking technologies are emerging to try and tackle these challenges. Network virtualization Overlay tunneling: VXLAN, NVGRE, STT Software-defined Networking (SDN) / OpenFlow L2 Fabric solutions: FabricPath, Qfabric, etc. [ insert other solution here ] Neutron provides a plugin mechanism to enable different technologies (more later).

7 What is Neutron?

8 Neutron Architecture Generic OpenStack APIs Compute API Operator Selected Backends KVM Tenant Tools (GUI, CLI, API code) Network API Storage API OVS Plugin Ceph An eco-system of tools that leverage the Neutron API. A generic tenant API to create and configure virtual networks A plugin architecture with different back-end engines

9 Basic API Abstractions Nova VM VM virtual server virtual interface (VIF) Neutron Net /24 virtual port L2 virtual network virtual subnet virtual networks and virtual subnets are fundamentally multi-tenant, just like virtual servers (e.g., overlapping IPs can be used on different networks).

10 Neutron Model: Dynamic Network Creation + Association TenantA-VM TenantA-VM TenantA-VM Tenant-A Net /24 Tenant-A Net /24 External Net /18 Tenant can use API to create many networks. When booting a VM, define which network(s) it should connect to. Can even plug-in instances that provide more advanced network functionality (e.g., routing + NAT).

11 Neutron API Extensions Enables innovation in virtual networking. Tenants can query API to programmatically discover supported extensions. Overtime, extensions implemented by many plugins can become core. Add properties on top of existing network/port abstractions: QoS/SLA guarantees / limits Security Filter Policies port statistics / netflow New Services L3 forwarding, ACLs + NAT ( elastic or floating IPs) VPN connectivity between cloud and customer site, or another cloud datacenter.

12 Neutron Architecture Generic OpenStack APIs Compute API Operator Selected Backends KVM Tenant Tools (GUI, CLI, API code) Network API Storage API OVS plugin Ceph An eco-system of tools that leverage the Neutron API. A generic tenant API to create and configure virtual networks A plugin architecture with different back-end engines

13 Neutron Architecture (generic) API Clients Neutron Service Backend X Neutron API Tenant Scripts Horizon GUI Orchestration Code Create-net... Createport Plugin X virtual switch Physical Network API Extension s Nova Compute Uniform API for all clients Interfaces from Nova plug into a switch manages by the Neutron plugin.

14 Neutron Plugins Trade-offs Different back-end engines present different trade-offs: Scalability Forwarding performance Hypervisor Compatibility Network HW Compat (vendor specific? Allow L3 scale-out?) Manageability / troubleshooting Advanced Features (exposed as API extensions) Production testing High Availability (control & data plane) Open source vs. Free vs. Paid Cloud Operators weigh trade-offs, choose a plugin. Note: Back-end technology hidden behind logical core API Example: VLANs vs. tunneling

15 Two API Deployment Models Cloud Operator creates networks for tenants Neutron API is admin only, tenants do not use it. Similar to nova-network model, but with flexibility around network topology, IP addressing, etc. Expose API to tenants directly True self-service networking. Tenants use scripts, CLI, or web GUI to manage networks & subnets. Can also mix-and-match strategies Provider creates default network connectivity, tenants can choose to extend.

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