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Wide Area OpenFlow Demonstration

This demonstration showcases a planned Wide-Area OpenFlow implementation from NOX to SPP, acting as a gateway between local OpenFlow networks. It covers the communication flow, packet encapsulation, key structure, supported actions, and the OpenFlow protocol message types.

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Wide Area OpenFlow Demonstration

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  1. Wide Area OpenFlow Demonstration Jon Turner, John DeHart, Fred KuhnsComputer Science & EngineeringWashington Universitywww.arl.wustl.edu

  2. Planned Wide-Area OpenFlow NOX hdrFmt lookup queue parse CP SC netFPGA NOX Princeton to SPP WashU Stanford 2 2 3 2 2 GaTech 3 3 Texas

  3. OpenFlow Site • Acts as gateway between Local OpenFlow Network and SPP node with OpenFlow code option. • Implemented in NetFPGA? • OpenFlow SPP • Receives Ethernet Frames from an OpenFlow Switch • Encapsulates Ethernet frames in IP/UDP pkt • Sends IP/UDP pkt to SPP • SPP  OpenFlow • Receives IP/UDP pkt from SPP node • Removes IP/UDP encapsulation • Sends Ethernet frame to OpenFlow switch NOX Gateway to SPP via I2

  4. SPP Node NPE TCAM GPE Filter Updates SPP-NOX lookup hdrFmt queue parse OFP CP SC netFPGA Switch LC

  5. T 0 (1b) Rx IP DA Index (4b) Slice ID (VLAN) (11b) Rx UDP DPort (16b) MN Key Bits 111-80 (32b) MN Key Bits 79-48 (32b) MN Key Bits 47-16 (32b) MN Key Bits 15-0 (16b) SPP Node Rsv (4b) Intf (4b) IP DAddr (32b) NPE TCAM Protocol (8b) UDP DPort (16b) Type (8b) GPE Filter Updates SPP-NOX lookup hdrFmt queue parse OFP CP SC netFPGA Switch NPE Lookup Key LC LC Lookup Key

  6. SPP Node NPE TCAM GPE Filter Updates SPP-NOX lookup hdrFmt queue parse OFP CP SC netFPGA Switch LC • LC Lookup(Interface, IP DA, Protocol, Rx UDP Dport)  Slice ID • Slice ID is encoded as VLAN used in Switch • VLAN will be used as Slice ID in NPE on other side of Switch

  7. SPP Node NPE TCAM GPE Filter Updates SPP-NOX lookup hdrFmt queue parse OFP CP SC netFPGA Switch LC • Rx Meta-Interface: (Interface, Slice ID, Rx UDP Dport) • NPE Lookup(Rx Meta-Interface, MN Key(112b))  Tx Meta-Interface • Hit: Causes pkt to be sent out on specificed physical interface with a new encapsulation header • Miss: Causes pkt to be sent to SC for communication to SPP-NOX

  8. NPE Lookup Key • NPE Lookup Key: • 144 bits • 32 bits of Substrate Key • 112 bits of MetaNet Specific key • MetaNet Specific Lookup Key: • 112 bits • For IPv4 MN: • IP DA (32b) • IP SA (32b) • Src Port (16b) • Dst Port (16b) • Proto/TCP Flags (16b) • Proposed For OpenFlow (109b) • VLAN Valid (1b) • VLAN (12b) • Src MAC (32b): Low 32 bits of Source MAC • Dst MAC (48b) • Ethertype (16b) • We are considering increasing the size of the NPE lookup key to a total of 288 bits, giving us 256 bits for the MetaNet specific lookup key. • Thus allowing us to support the full OpenFlow key (232b)

  9. OpenFlow Required Actions • Forward: • Forwarding the pkt to physical ports and the following virtual ones: • All: Send pkt out all interfaces, not including incoming interface • Controller: Encapsulate and send packet to the controller • Local: Send the packet to the switch’s local networking stack • Table: Perform the actions in the flow table. Only for packet-out messages • Packet-out messages are data packets that the controller wants to have the switch send out. • In-Port: Send pkt out the input port • Drop

  10. SPP-OpenFlow Supported Req’d Actions • Forward: • Forwarding the pkt to a physical ports and the following virtual ones: • All: Send pkt out all interfaces, not including incoming interface • Controller: Encapsulate and send packet to the controller • Local: Send the packet to the switch’s local networking stack • ???Table: Perform the actions in the flow table. Only for packet-out messages • Packet-out messages are data packets that the controller wants to have the switch send out. • In-Port: Send pkt out the input port • Drop

  11. OpenFlow Optional Actions • Forward • Normal: process the packet using the traditional forwarding path supported by the switch. • Flood: Flood the packet along the minimum spanning tree • Modify-Field • Set VLAN ID • Set VLAN Priority • Strip VLAN Header • Modify Ethernet SMAC • Modify Ethernet DMAC • Modify IP SA • Modify IP DA • Modify Transport Sport • Modify Transport DPort

  12. SPP-OpenFlow Supported Opt’l Actions • Forward • Normal: process the packet using the traditional forwarding path supported by the switch. • Flood: Flood the packet along the minimum spanning tree • Modify-Field • Set VLAN ID • Set VLAN Priority • Strip VLAN Header • Modify Ethernet SMAC • Modify Ethernet DMAC • Modify IP SA • Modify IP DA • Modify Transport Sport • Modify Transport DPort

  13. OpenFlow Switch/Controller Communication • Uses an SSL Connection • Can we support this? • If we use the NOX software, how easy is it to change this?

  14. OpenFlow Protocol (OFP) • Message Types: • Immutable Messages: • HELLO • Exchanged between Switch and Controller upon connection startup. • Negotiates OFP version to be used. • ERROR • Switch alerts Controller of problems or error conditions • ECHO {REQUEST, REPLY} • Initiated by either Switch or Controller, other side must reply. • May be used to indicate: latency, bandwidth or liveness of the connection • VENDOR • Identifies Switch Vendor using IEEE OUI (Organizationally Unique Identifier)

  15. OpenFlow Protocol (OFP) (con’t) • Message Types: • Switch Configuration Messages (initiated by controller) • FEATURES {REQUEST, REPLY} • Controller requests switch to report its capabilities • GET_CONFIG {REQUEST, REPLY} • Controller queries current configuration of switch • SET_CONFIG • Controller sets configuration parameters of switch • No response

  16. OpenFlow Protocol (OFP) (con’t) • Message Types: • Asynchronous Messages (Switch to Controller) • PACKET_IN • Packets with no matching flow entry are sent to controller • Packets that match a flow entry with an action of “send to controller” • FLOW_EXPIRED: switch reports expiration/removal of an entry. • Flow entries have idle timeouts assigned for inactivity removal • Flow entries have a hard timeout for removal regardless of activity. • Timeout based removal is done by the switch and the controller is notified. • PORT_STATUS • Switch sends port status messages to report port configuration state changes.

  17. OpenFlow Protocol (OFP) (con’t) • Message Types: • Controller Command Messages • PACKET_OUT • Controller to send packets out a specified port on switch • FLOW_MOD • Add, Delete, Modify Flow entries in Flow Table • PORT_MOD • Set Switch port properties • Statistics Messages: • STATS {REQUEST, REPLY} • Collect statistics from Switch

  18. OFP: FLOW_MOD Messages • ADD • Identical entry already exists (identical header fields and priority): • Remove existing entry and its counters and add new entry. • Conflicting entry already exists (same priority both could be match): • Refuse addition and respond with OFPEFM_ADD_OVERLAP error message. • No conflict: • Add new entry so priority is handled appropriately. • MODIFY • If a flow entry with identical header fields does not exist then the new flow entry should be added and its counters zeroed. • If one or more entries match then they are ALL modified • MODIFY_STRICT • If all fields including wildcards and priority match then that entry is modified • DELETE • If one or more entries match then they are ALL deleted • DELETE_STRICT • If all fields including wildcards and priority match then that entry is deleted

  19. SPP-OFP: FLOW_MOD Messages • ADD • Can we tell if there are conflicts? • MODIFY • Only support _STRICT? • MODIFY_STRICT • DELETE • Only support _STRICT? • DELETE_STRICT

  20. OFP: Capabilities • FLOW_STATS • Able to report per flow statistics • TABLE_STATS • Able to report per Flow Table statistics • PORT_STATS • Able to report per Port statistics • STP • Able to support 802.1d spanning tree protocol • MULTI_PHY_TX • Able to support transmitting received packet out multiple physical interfaces • IP_REASM • Able to support reassembly of IP fragments

  21. SPP-OFP: Capabilities • FLOW_STATS • Able to report per flow statistics • TABLE_STATS • ???Able to report per Flow Table statistics • PORT_STATS • Able to report per Port statistics • STP • Able to support 802.1d spanning tree protocol • MULTI_PHY_TX • Able to support transmitting received packet out multiple physical interfaces • IP_REASM • Able to support reassembly of IP fragments

  22. Plan for SPP Implementation • Step 1: Fast Path Code Option Implementation • Test using current set of control utilities to populate lookup table • Step 2: SC/NOX • Implemented using out-of-band SSL connections • Step 3: SC/NOX • Implemented through data path • Still unclear how to support SSL for this.

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