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Open Flow Tutorial Series - Set 1
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Radhika Hirannaiah
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This set presents a basic tutorial on Open Flow Based Switching
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Open Flow Tutorial Series - Set 1
1.
OPENFLOW BASED SWITCHING An OpenFlow
Tutorial Series – Set 1 @author Radhika Hirannaiah Version 1.0 August 2013 © 2013 Radhika Hirannaiah
2.
Traditional Switch Components Control
Plane Data Plane Packet In Packet Out © 2013 Radhika Hirannaiah MAC Address Table MAC Address Port VLAN ID 0x0A 2 3 0x0B 5 22 0x0C 9 7 CPURoute Cache
3.
OpenFlow • Technically, OpenFlow
is a wire protocol for communication between a Control and Data Plane • OpenFlow based technology also implies that Control and Data planes don’t have to be on the same hardware – they just have to be IP visible to each other. • Control Plane software is referred to as “Controller” • Data Plane software is referred to as “OpenFlow Datapath” or “OpenFlow Switch” © 2013 Radhika Hirannaiah
4.
OpenFlow: Control/Data Plane Separation Controller OpenFlow Switch (or
Data Path) Packet In Packet Out Control Plane Data or Forwarding Plane © 2013 Radhika Hirannaiah
5.
Advantages of Open
Flow • Controller controls how packets are forwarded • Make deployed networks programmable not just configurable • Advocates a separation of the data and control palne for the flow network. • Allows for programming of “flows” (traffic type) rather than just source/destination MAC/IP • Allows for switching at different network layers to be combined. • Allows granularity and layering to be at the discretion of the owner/operator and suited to the user/application. • Not limited by the platform or be enforced by the protocols. © 2013 Radhika Hirannaiah
6.
OpenFlow Switch Components Controller OpenFlow
Data Path Packet In Packet Out © 2013 Radhika Hirannaiah Group Table Flow Table Flow Table OpenFlow Channel
7.
Packet Processing Controller OpenFlow Data
Path Packet In Packet Out © 2013 Radhika Hirannaiah Group Table OpenFlow Channel
8.
OpenFlow’s Flow Identification
Fields © 2013 Radhika Hirannaiah Considered by OpenFlow Match fields – for Ethernet traffic Considered by OpenFlow Match fields – for IP Traffic Wildcard Wildcard
9.
Main components of
Flow table entry • Match Criteria 1. Layer 1/2 1. Ingress Port 2. Ethernet Source 3. Ethernet Destination 4. VLAN ID 5. VLAN Priority 6. MPLS Label 2. Layer 3 1. IP Source 2. IP Destination • Instructions 1. Go To Table 2. Metadata 3. Action Set 1. Forward 2. Apply QoS 3. Drop 4. Apply to Group © 2013 Radhika Hirannaiah Match Fields Priority Counters Instructions Timeouts Cookie
10.
Packet Flow thro’
Processing Pipeline © 2013 Radhika Hirannaiah
11.
Packet Processing in
a OpenFlow Switch © 2013 Radhika Hirannaiah
12.
Example of flow
forwarding in an OpenFlow Switch OpenFlow Data Path © 2013 Radhika Hirannaiah Group Table Flow Table Flow Table OpenFlow Channel X Y Host A Host B Flow Table Match Action Src Port X Fwd to port Y Src Port Y Fwd to port X
13.
Example of Packet
Processing Table 0 © 2013 Radhika Hirannaiah Match Fields Priority Counters Instructions Timeouts Cookie Ingress Port + Metadata + Pkt headers 99 Goto Table 2 … 10 Out Port X … 50 Goto Group ID 5 … 1 Goto Group ID 15 … 76 Drop Packet
14.
Components of Group
Table © 2013 Radhika Hirannaiah Group Identifier Group Type Counters Action Buckets 5 Out port x,y 15 Out port a 6 Group ID 5 7 Out port m, Group ID 15 9 Drop Packet • Group Type – All, Select, Indirect, Fast Failover • Counters – Updated when packets are matched
15.
Packet Processing w/
Group Table Controller OpenFlow Data Path Packet In Packet Out © 2013 Radhika Hirannaiah OpenFlow Channel GROUP TABLE Group Identifier Group Type Counters Action Buckets 5 Out port x,y 6 Group ID 5 7 Out port m, Group ID 5 9 Drop Packet
16.
Contact Questions, Comments, Suggestions,
use my Gmail ID: radhikamh www.linkedin.com/in/radhikahirannaiah © 2013 Radhika Hirannaiah