OpenFlow: Concept and Practice. Dukhyun Chang
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1 OpenFlow: Concept and Practice Dukhyun Chang 1
2 Contents Software-Defined Networking (SDN) Overview of OpenFlow Experiment with OpenFlow 2/24
3 Software Defined Networking.. decoupling the network control and data planes, and putting the former under the control of software running in a (logically) central location from Verivue blog posing by Larry Peterson 3/24
4 ONF s View of SDN Open Networking Foundation (ONF) s View 4/24
5 ONF s View of SDN The SDN architecture is Directly programmable Agile Centrally managed Programmatically configured Open standards-based and vendor-neutral 5/24
6 OpenFlow Overview a communications protocol that gives access to the forwarding plane of anetwork switchorrouterover the network 6/24
7 OpenFlow (v1.0) Switch Flow table packet lookup and forwarding Secure channel the controller manages the switch over the secure channel using the OpenFlow protocol 7/24
8 Flow Table 8/24
9 Flow Table Actions required actions forward all, controller, local, table, in_port drop optional actions forward normal, flood enqueue modify-field 9/24
10 Flow Table Counters they are maintained per-table, per-flow, perport and per-queue 10/24
11 Matching Packet flow in an OpenFlow switch 11/24
12 Matching Examples Ethernet Switching Switch Port MAC src MAC dst Eth type VLAN ID Src Dst Prot TCP sport TCP dport Action * * 00:1F:. * * * * * * * Fwd to port6 Routing Switch Port MAC src MAC dst Eth type VLAN ID Src Dst Prot TCP sport TCP dport Action * * * * * * * * * Fwd to port6 Application Firewall Switch Port MAC src MAC dst Eth type VLAN ID Src Dst Prot TCP sport TCP dport Action * * * * * * * * * 22 drop 12/24
13 Mathcing Examples Flow Switching Switch Port MAC src MAC dst Eth type VLAN ID Src Dst Prot TCP sport TCP dport Action port3 00:2E:.. 00:1F: vlan Fwd to port6 VLAN + App Switch Port MAC src MAC dst Eth type VLAN ID Src Dst Prot TCP sport TCP dport Action * * * * vlan1 * * * * 80 Fwd to port6 Port + Ethernet + Switch Port MAC src MAC dst Eth type VLAN ID Src Dst Prot TCP sport TCP dport Action port3 00:2E:.. * 0800 * * * 22 drop 13/24
14 Secure Channel Controller-to-Switch features, configuration, modify-state, readstate, send-packet, barrier Asynchronous packet_in, flow-removed, port-status, error Symmetric hello, echo, vendor 14/24
15 OpenFlow Controller The OpenFlow ecosystem has seen rise to numerous controllers in multiple languages (C, C++, Java, Python and Ruby for starters) NOX, Beacon, Maestro, Floodlight, etc. 15/24
16 OpenFlow Switches NEC HP Pronto 16/24
17 Experiment with OpenFlow Emulation tool Mininet HiFi Mininet HiFi creates scalable (up to hundreds of nodes) softwaredefined (e.g. OpenFlow) networks on a single PC Handigol, N., Heller, B., Jeyakumar, V., Lantz, B., and McKeown, N. Reproducible network, experiments using container-based emulation, OpenFlow switch Open vswitch Multilayer virtual switch Controller one of many OpenFlow controllers NOX, floodlight,.. 17/24
18 Mininet: Sample Workflow creating a network interacting with a network using custom topology 18/24
19 Mininet: Custom Topologies Define using a simple Python API 19/24
20 Mininet: xterm Display - Host(Client and Server) Nodes terminal h4 h1 h3 20/24
21 Mininet Flow table list - Normal switch on route (i.e. s16) 1. output : forward to output port Switches flow entry info. - First and last switch on route (i.e. s18) 1. mod_nw_src or mod_nw_dst : change header 2. output : forward to output port 21/24
22 WireShark 22/24
23 Mininet: Connecting Controller Any OpenFlow controller can be used in mininet using a remote controller Example 23/24
24 References Materials at ONS 2011/ N. Mckeown, Making SDNs Work B. Heller et al., Tutorial 1: SDN for Engineers IETF materials on SDN Materials at Krnet 2012 Sangheon Pack, Software-Defined Networking (SDN): Concept, Control, and Applications Jeongkeun Lee, Controller-based Networking and SDN development 24/24
25 25
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