Ryu¶

About

• Network opearting system
• OVS, openflow switch
• python
• www.osrg.net/ryu

Network management applications on top of Ryu (inside a controller node)¶

• GRE tunneling
• VLAN support
• topology discovery
• MAC based segregation

'Only commodity hardware'

Ryu <--> OpenStack¶

• Flat networks regardless of the underlying physical network
• Scalable multi-tenant isolations
  • tunneling based isolations
  • VLAN does not scale larger than 4096
  • do not need high-end switches
• Future items:
  • integration with quantum IPAM and L3 API
  • firewall
  • virtual network <--> physical network
  • distributed controllers (redundancy)

Quantum plugin for each network technology

Communication¶

'nova requests quantum-server for network configuragion'

OVS <--> Ryu: openflow

Ryu agent <--> Ryu: REST API

Quantum server <--> Ryu: REST API

Ryu agent <--> Quantum db: db access

VIF driver <--> quantum: Quantum API
linux_net driver <--> server: Quantum API

Network Creation (network-node = nova-network + linux_net driver + OVS)¶

1. to nova-network: create netork
2. nova network --> quantum server: create net
3. quantum server --> Ryu: network <uuid>, <tunnel key>
4. quantum server --> nova network: <uuid>
5. nova network --> linux_net driver: plug
6. linux_net driver --> OVS: create gw-xxx
7. linux_net driver --> quantum server: tentant id, network id, dp id, port, mac
8. quantum server --> Ryu: network id, dp id, port, mac
9. ryu --> OVS: set flow entryies

Instance creation (compute-node = nova compute + VIF driver + OVS)¶

1. to nova compute: create instance
2. nova compute --> quantum server: create port
3. quantum server --> nova compute: uuid
4. nova compute --> VIF driver: plug
5. VIF driver --> OVS: create tap-xxx
6. VIF driver --> quantum server: (tenant_id, dp_id, port, mac)
7. quantum server --> Ryu: (network_id, dp_id, port, mac)
8. Ryu --> OVS: set flow entryies

Node boot up (compute/network-node = OVS + Ryu agent + ryu_v2.ini)¶

1. ryu_v2.ini --> Ryu agent: get ip address
2. Ryu agent --> quantum db: register (dp_id, ip_address)
3. quantum db --> Ryu agent: get list of (dp_id, ip_address, and polling)
4. Ryu agent --> OVS: create vport_grc to ip address
5. Ryu agent --> Ryu: register (dp_id, port_id, remote dp_id)

Component: separation unit¶

• interface for control and states and generates events
• communicate by message passing
• language independency

OBS:¶

two ways oto isolate tenants: GRE tunnel and VLAN