Lesson 9 OpenFlow. Objectives :

Transcription

1 1 Lesson 9 Objectives : is new technology developed in 2004 which introduce Flow for D-plane. The Flow can be defined any combinations of Source/Destination MAC, VLAN Tag, IP address or port number etc. Controller (OFC) will assign Rule/Action/Statistics for each flow and set flow table. For data transfer, simple forwarding is used.

2 Structure Controller Separation Switch cloud = Controller (OFC) Switch (OFS) Switch (OFS) Switch (OFS) Action table Flow Table Flow Table Flow Table

3 Definition of Flow Conventional Switch L2(MAC) or L3(IP) is explay L2(MAC) Switching L3(IP) Routing MAC Destination Address MAC Sender Address VLAN Tag IP Sender Address IP Destination Address L4 Sender Port Number L4 Destination Port Number User data Flow =Any combination of {L2(MAC), L3(IP), L4(Port Number)} and action for flow will be set by controller.

4 Any combination of following data Ingress Port Metadata Ethernet source address Ethernet destination address Ethernet type VLAN ID VLAN priority MPLS label MPLS traffic class IPv4 source address IPv4 destination address IPv4 protocol / ARP opcode IPv4 ToS bits TCP/ UDP/ SCTP src port / ICMP Type TCP/ UDP/ SCTP dst port / ICMP Code

5 Action in the OFS ( Switch) Several Table: Action is set to packet Match Fields Counters Instructions Flow entry What is action: Forward, Enqueue (Save), Drop, Modify-Field

6 Sequence of 3Path Computation Switch OFS#3 5Packet transfer OFS#2 Switch 4Set flow table OFC 2Ask route Host#2 Switch OFS#4 Switch OFS#1 1Receiving packet Packet Host#3 Flow Table Host#1

7 Ex(1) Ethernet Broadcasting Key Action1 Input Port = MAC DA MAC DA = FF:FF:FF:FF:FF:FF MAC SA = MAC SA VLAN ID = TYPE = Proto= ToS= IP SA = IP DA = Src Port = Dest Port = OUTPUT = FLOOD This OFS is act as ethernet SW Flow Broadcast frame OFS

8 Ex(2) IP Forwarding Key Action1 Action2 Input Port = 2 MAC DA MAC DA = 00:00:4c:22:22:22 MAC SA = 00:00:4c:11:11:11 MAC SA VLAN ID = 100 TYPE = 0x0800 Proto=6 ToS= 0 IP SA = IP DA = Src Port = Dest Port = 80 SET_DL_DST = 00:00:4c:33:33:33 OUTPUT = 6 This OFS is act as IP router Input Packet Flow Switched Output Packet OFS

9 Ex(3) IP Multicast Key Action1 Action2 Action3 Action4 Input Port = 2 MAC DA MAC DA = 01:00:5e:0a:0a:01 MAC SA = MAC SA VLAN ID = TYPE = 0x0800 Proto= ToS= IP SA = IP DA = Src Port = Dest Port = SET_DL_SRC = 00:00:4c:00:00:06 OUTPUT = 6 SET_DL_SRC = 00:00:4c:00:00:08 OUTPUT = 8 Input Packet This OFS is act as IP multicast Flow Multicast IP Packet OFS Multicast IP Packet

10 Hop-by-hop Flow Switching All node is OFS. OFC set action to all OFS. Controller All node = OFS 3Set Flow table 2Notify to OFC Physical topology 1Packet-In

11 Overlay Tunneling Switch Controller 1Set Flow table 3End-end tunneling Physical topology 2Packet-in There are tunnel among all edge OFS node. Overlay topology

12 Google inter-datacenter NW (ex) Google Data Centre ex. MPLS tunnel Switch (Edge) (a) OFS constructed on conventional network Internet (b) Edge-edge tunneling with OFS at edge

13 Conclusions for Lesson9 is one of the new important backbone network technology. Flow defined by any L2/L3/L4 header and data can be transfer by simple flow switching. Overlay tunneling OFS is overlaying on conventional IP network and easy implemened by data centre operators. 13