Exercise 6 - Communication Systems Group
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1. h1 NO IP eth1 NO IP eth1 NO IP h2 X 192 0 0 4 24 eth2 X 192 0 0 5 24 eth2 X 192 0 0 6 24 HYPERVISOR LINUX KERNEL BRIDGES ETC HOST OS OF PHYSICAL VM XEN SERVER OFELIA ETHZ3 ETH2 PHYSICAL INTERFACE Figure 2 Sample setup for running exercise 1 on the OFELIA ETHZ testbed island In case you use other islands the setup should be adjusted accordingly Only the data plane connectivity e g over the eth2 interface of the servers is depicted for simplicity Control plane connectivity e g for accessing the VMs and controlling the switches is carried out out of band Control IPs are automatically assigned by the framework and are unique per VM control interface OpenFlow controller as specified in exercise 1 you may of course adjust the IPs you are using for the clients and servers The python script you developed for exercise 1 should suffice 16 After the experiment is concluded make sure you clean up your slice and free resources for other experimenters step 4 3 of the OFELIA tutorial 3 That is make sure that you have stopped your slice i e deallocated your flowspace and that you have stopped and deleted your VMs Submission and Debriefing There is no submission required for this exercise Its purpose is to encourage you to start experimenting on real world SDN testbeds using your portable OpenFlow code Also you will see that using an open interface to the network resources is of great value This means that you2. ETH Ziirich HS 2014 Communication Systems Group Advanced Topics in Communication Networks Lecturers Prof Dr Bernhard Plattner Tasks of Exercise 6 Dr P Georgopoulos Dr B Ager Assigned 10 December 2014 Dr M Happe Dr K Hummel Debriefing 17 December 2014 TA Vasileios Kotronis Exercise 6 Introduction In this exercise you will become familiar with deploying and running OpenFlow based 9 experiments on a real OpenFlow testbed distributed across Europe the OFELIA testbed 5 In particular you will replicate the setup of exercise 1 Building a simple load balancer on top of the POX OpenFlow con troller 1 over the OFELIA testbed island at ETHZ 2 You can also use any other island that belongs to the OFELIA testbed but keep in mind that since the OFELIA project has ended the testbed is a best effort facility now in terms of administration and maintenance The ETHZ island offers switches running OpenFlow v1 0 10 that are sliced via FlowVisor and are presented as virtualized network re sources ports flowspaces In addition the ETHZ island offers Virtual Machines VMs running on top of physical XEN servers These VMs can be used as end hosts for any kind of experimentation including the deployment of OpenFlow controllers Optional Prerequisite As a side note in order to connect to the OFELIA control network you need to update your network and DNS settings on your computer see instructions later If you a
3. ated AMs to Acquire project permissions from IM of home island Create a Project allocate VMs the project project permission start the slice Run your slice controller run VMs Update the Slice slice optional Collect results Stop the slice expiration del etion run experiment Figure 1 OFELIA User Work Flow e ETHZ island description 2 f OFELIA whitepaper 11 2 Register to the OFELIA testbed in order to acquire a login account and the matching credentials step 2 1 of the OFELIA tutorial 3 ATTENTION The registration URL described in 3 has changed since it was last written The updated registration URL is https register fp7 ofelia eu registration register 3 Login to OFELIA and setup your VPN connection to access the OFELIA testbed step 2 2 of the OFELIA tutorial 3 ATTENTION The login URL described in 3 has changed since it was last written The updated URL is https register fp7 ofelia eu login login 4 Connect over VPN to the OFELIA control network step 2 2 of the OFELIA tutorial 3 5 Login to the OFELIA Control Framework step 2 3 of the OFELIA tutorial 3 6 Create a new project request and acquire the necessary permissions from the island manager of your home island step 3 1 of the OFELIA tutorial 3 7 Add the required Aggregate Managers AMs to your project e g ETHZ island Virtualization AM ETHZ island Openflow AM 8 Crea
4. can interface both with the OpenVswitch used in Mininet and a real OpenFlow switch used in OFELIA testbeds without having to change your controller s code Debriefing All students are requested to attend the debriefing session on December 17 where a short discussion and recap of the exercise will take place At the same day a wrap up of all the exercises of the course will occur You will have the opportunity to provide feeback to the TA participate in the general discussion form Q amp A recap what you have learned and suggest further improvements pertaining to the exercises and the course in general Asking for help For any issues you may encounter during the exercise please ask the teaching assistant V Kotronis during the exercise sessions 13 00 15 00 at ETZ G91 on 10 12 and or 17 12 or send him an email to vkotroni tik ee ethz ch Enjoy References 1 2 a 3 4 5 6 7 8 a a4 9 10 11 Exercise 1 Building a simple load balancer on top of the POX OpenFlow controller http www csg ethz ch education lectures ATCN hs2014 exercises exercisel_assignment pdf OFELIA Testbed Zurich ETHZ island https alpha fp7 ofelia eu doc index php Testbed_Zurich OFELIA tutorial http www fp7 ofelia eu assets Uploads OFELIA Tutorial pdf OFELIA user manual and documentation wiki https alpha fp7 ofelia eu doc index php Main_Page Official OFELIA project website
5. he ETHZ island to perform the exercise s tasks you can ask for the following resources via the OpenFlow AM interface e Switch 02 00 00 00 00 00 00 02 port 13 this port faces the interface eth2 of the VM server ofelia ethz3 e Switch 02 00 00 00 00 00 00 02 port 14 this port faces the interface eth2 of the VM server ofelia ethz2 ATTENTION due to a bug in the backend database this port appears to connect to interface eth1 of ofelia ethz2 while in reality it connects to interface eth2 The full correct topology can also be found at 2 The above switch ports facing two data plane interfaces in this case eth2 of two VM servers of the ETHZ island should provide all the network resources you would require to proceed with your task Remember that for re implementing exercise 1 you will need only one switch You can allocate the clients of the exercise on one VM XEN server and the servers of the exercise on another VM XEN server as both XEN servers are connected to the aforementioned switch One port of the switch will face the virtual kernel bridge associated with the eth2 interface of the first VM server where clients reside while the other port will face the virtual kernel bridge associated with the eth2 interface of the second VM server where servers reside We mention the term kernel bridge because this is in reality the way that multiple virtual interfaces are multiplexed and connected to the physical in
6. http www fp7 ofelia eu POX Git Repository https github com noxrepo pox POX Wiki https openflow stanford edu display ONL POX Wiki Vasileios Kotronis ATCN Lecture SDN Testbeds and Experimentation http www csg ethz ch education lectures ATCN hs2014 material SDN_Testbeds pdf Nick McKeown Tom Anderson Hari Balakrishnan Guru Parulkar Larry Peterson Jennifer Rex ford Scott Shenker and Jonathan Turner OpenFlow enabling innovation in campus networks SIGCOMM CCR 38 2 69 74 2008 Open Networking Foundation OpenFlow Switch Specification v1 0 0 https www opennetworking org images stories downloads sdn resources onf specifications openflow openflow spec vl 0 0 pdf Marc Su Leonardo Bergesio Hagen Woesner Tom Rothe Andreas K psel Didier Colle Bart Puype Dimitra Simeonidou Reza Nejabati Mayur Channegowda et al Design and Implementa tion of the OFELIA FP7 Facility the European OpenFlow Testbed Computer Networks 61 132 150 2014
7. re reluctant to do this on your every day OS we recommend using a Linux VM on top of your regular OS via a hypervisor e g VirtualBox so as not having to change any network or DNS configuration on your system Tasks Figure 1 depicts the high lever user work flow in order to run experiments on the OFELIA OpenFlow testbed This might seem a bit daunting at first but it is worth the effort when you realise that you will be able to run OpenFlow experiments on a real testbed running across Europe although you are asked for simplicity to run your experiment on only one OpenFlow island i e the ETHZ one nothing precludes you from running federated tests In particular the tasks that you will have to implement for this exercise are the following 1 Learn about OFELIA The suggested information sources are the following a ATCN lecture on SDN Testbeds and Experimentation delivered on 8 12 2014 8 b Official OFELIA project website 5 c OFELIA user manual and documentation wiki 4 d OFELIA tutorial 3 Note This tutorial plus the wiki information 4 will be your main guides for completing this exercise Learn about OFELIA Wait for OF resource allocation upon IMs Register for an OFELIA account and acquire credentials Define OF resources define OF controller Connect over VPN to OFELIA control network Create an experimental slice within Login to home island Expedient UI Add feder
8. te an experimental slice within your project step 3 2 of the OFELIA tutorial 3 Make sure you also add the needed AMs to your slice in order to be able to access the associated resources 9 Set the OpenFlow controller for your OpenFlow network step 3 2 of the OFELIA tutorial 3 You can use the IP of the OFELIA OpenVPN tunnel interface on your computer home VM or the IP of any other created VM within the island which belongs to your slice see later steps on how to create VMs using the virtualization AM interface This step is optional at this point 10 Set a request for OpenFlow resources step 3 3 of the OFELIA tutorial 3 In the current version of the user interface you have the option to choose between Simple and Advanced resource 2 11 12 allocation processes In Simple mode you simply specify the ports and datapath ids that you want to use from the testbed topology textually or graphically and then an available VLAN from the island will automatically be assigned to the requested flowspace In Advanced mode you again specify the ports and datapath ids that you want to use from the testbed topology as a first step but as a second step you can also specify your own flowspace using tables of ranges e g I want the IPs between 192 168 56 1 and 192 168 56 4 In the end an available VLAN by the island manager will also be assigned to the requested flowspace If you are for example using t
9. terface of the server However you do not have to deal with this detail as experimenters Reminder these OpenFlow resources will be booked but are not yet requested and allocated at this stage see later steps for those processes Create the VMs you need step 3 4 of the OFELIA tutorial 3 According to the setup of exercise 1 you can allocate 3 VMs on ofelia ethz2 representing clients and 3 VMs on ofelia ethz3 representing servers Please use the minimum RAM requirement for VMs whichis 128 MBytes Also please do NOT include underscores in the VM s name since this will lead to the failure of the creation of your VMs After creation you can start reboot stop or delete your VMs at any time Each VM will automatically get a control IP on interface eth0 you can use this IP to ssh into the VM as long as you are connected to the OFELIA control network over VPN Note Besides the client and server VMs you are advised to create a VM that will host your OpenFlow controller e g POX After you create this VM please set the correct controller IP for the control of the OpenFlow resources see Network resources part of the slice management webpage ATTENTION We highly recommend to use a small number of VMs e g 2 3 clients 2 3 servers and one controller for your experiment with the load balancer The testbed resources are not infinite thus heavy usage by multiple experimenters may result in denying the creation of ne
10. use any other of the rest of the OFELIA islands For example the i2CAT island in Spain and and CreateNet in Italy are considered quite stable for running reliable experiments Now you can test the OpenFlow load balancer application that you wrote for exercise 1 the code should be portable To achieve this you can simply download POX 6 7 on your OpenFlow controller VM which you either have to create in one of the island servers preferably not the ones used for the exercises clients or servers or run it locally on your computer and run the OFELIA ETHZ2 SERVER HOSTS CLIENTS AND CONTROLLER e C8 CLIENT_1 VM CLIENT_2 VM CLIENT_3 VM CONTROLLER VM eth0 CONTROL_IP eth0 CONTROL_IP eth0 CONTROL_IP eth0 CONTROL_IP AUTO ASSIGNED AUTO ASSIGNED AUTO ASSIGNED AUTO ASSIGNED h1 NO IP h2 X 192 0 0 1 24 h1 NO IP eth1 NO IP eth1 NO IP h2 X 192 0 0 2 24 eth2 X 192 0 0 3 24 eth2 NO IP e e HYPERVISOR LINUX KERNEL BRIDGES ETC HOST OS OF PHYSICAL VM XEN SERVER OFELIA ETHZ2 SWITCH ETH2 PHYSICAL INTERFACE 02 00 00 00 00 00 00 02 PORT 14 OFELIA ETHZ3 SERVER HOSTS SERVERS PORT 13 Coors Cons een ERVER_1 VM SERVER_2 VM SERVER_3 VM h0 CONTROL_IP eth0 CONTROL_IP eth0 CONTROL_IP AUTO ASSIGNED AUTO ASSIGNED AUTO ASSIGNED
11. w VMs In this case please send an email to the TA for further consulting Start your experiment slice step 4 1 of the OFELIA tutorial 3 ATTENTION Until you receive the flowspace approval by the island manager your flowspace has not yet been granted and cannot be used Only granted flowspace is known to the Flow Visor that handles the slicing of the OFELIA OpenFlow resources This will occur when the island 13 14 15 manager approves your flowspace You will be notified by email and will notice the change in the slice management page after the approval is successful Set the data plane interfaces on your client and server VMs so as to run your experiment step 4 2 of the OFELIA tutorial 3 ATTENTION Please check the VLAN tag that has been assigned from the island manager to your experiment flowspace before using the interfaces on the VMs For example if you have been assigned VLAN X you have to configure the eth2 interface of all your VMs on server ofelia ethz2 and ofelia ethz3 servers as eth2 X Since you will need root access to install the vlan package and configure the virtual interfaces make sure you change your permissions using su with password openflow while being ssh ed to the respective VM At this point your setup should look like the one in Figure 2 assuming that you are using the ETHZ island to run your experiments In case not enough resources are available at ETHZ island you are advised to
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