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Category: SDN

Learning Switch tutorial on Ryu + OVS 2.0 + OF 1.3

Published by castroflaviojr on November 14, 2013

This tutorial aims to make you get in touch with some subtleties of the OpenFlow 1.3. The requirements for this tutorial are:

  • Mininet 2.1 (If you haven’t installed it yet, follow this link)
  • Ryu (If you haven’t installed it yet, follow this link)
  • OpenVSwitch 2.0 (If you haven’t installed it yet, follow this link)
  • Openflow 1.3 (If you haven’t installed it yet, follow this link)

So this tutorial will follow these steps:

  1. Test OVS 2.0 + RYU(OF1.0)
  2. Test MN user’s switch + MN controller. ( Verify it doesn’t work.)
  3. Test OVS 2.0 +MN controller. ( Verify it works)
  4. Test MN user’s switch + RYU (OF1.0). ( Verify it doesn’t work.)
  5. Test MN user’s switch + RYU (OF1.3). ( Verify works fine.)
  6. Test OVS 2.0 (OF1.0) + RYU (OF1.3)
  7. Test OVS 2.0 (OF1.3) + RYU (OF1.3)
  8. Conclude OVS 2.0 (OF1.0+1.3) + RYU (OF1.3) rules!

SO, in this tutorial we will test several scenarios. The initial problem we faced with OF1.3 was negotiation. Basically, if controller and switch don’t match versions they won’t talk, and won’t work.

I will give you the best solution in advance, then if you want to understand a lil better you can read the article to the end. The best solution is to enable OVS 2.0 switches to work with all versions of OF AND make sure RYU is running the right code.

Start ryu with OF13. (Note in line 20 of the code that Ryu imports OF13)

cd ryu
 PYTHONPATH=. ./bin/ryu-manager ryu/app/simple_switch_13.py

Start Mininet:

sudo mn --topo linear,4 --mac --switch ovsk --controller remote
h1 ping h4

Enable OpenFlow 1.3 in the switches. ( you need to open a new terminal with xterm s1 for that)

ovs-vsctl set bridge s1 protocols=OpenFlow10,OpenFlow13
ovs-vsctl set bridge s2 protocols=OpenFlow10,OpenFlow13
ovs-vsctl set bridge s3 protocols=OpenFlow10,OpenFlow13
ovs-vsctl set bridge s4 protocols=OpenFlow10,OpenFlow13

The article is not finished haha, I will finish it ASAP.

3 Comments

Setting up OpenVswitch 2.0 + Mininet 2.1+ Ubuntu 13.04

Published by castroflaviojr on November 14, 2013

I’ve been struggling trying to set up the OVS 2.0 with Mininet 2.1 on Ubuntu 13.04 and after installing it, it would work fine but after rebooting the OS the OVS didn’t work I don’t know why yet.

So, What did I do to fix it? This:

After searching around the internet a found this article which didn’t work completely, but after I found this one with a few changes in the OVS-something syntax I thought it would work fine but it still didn’t.

I did this exactly to install:

sudo -s
apt-get update
apt-get install -y git automake autoconf gcc uml-utilities libtool build-essential git pkg-config linux-headers-`uname -r`
wget http://openvswitch.org/releases/openvswitch-2.0.1.tar.gz
tar zxvf openvswitch-2.0.1.tar.gz
cd openvswitch-2.0.1
./boot.sh
./configure --with-linux=/lib/modules/`uname -r`/build
make && make install
insmod datapath/linux/openvswitch.ko
mkdir -p /usr/local/etc/openvswitch
ovsdb-tool create /usr/local/etc/openvswitch/conf.db vswitchd/vswitch.ovsschema
ovsdb-server -v --remote=punix:/usr/local/var/run/openvswitch/db.sock \
--remote=db:Open_vSwitch,Open_vSwitch,manager_options \
--private-key=db:Open_vSwitch,SSL,private_key \
--certificate=db:Open_vSwitch,SSL,certificate \
--pidfile --detach --log-file
ovs-vsctl --no-wait init
ovs-vswitchd --pidfile --detach
ovs-vsctl show

So, finally I decided to do this everytime I perform a reboot:

sudo -s
cd openvswitch-2.0.1
ovsdb-tool create /usr/local/etc/openvswitch/conf.db vswitchd/vswitch.ovsschema
ovsdb-server -v --remote=punix:/usr/local/var/run/openvswitch/db.sock \
--remote=db:Open_vSwitch,Open_vSwitch,manager_options \
--private-key=db:Open_vSwitch,SSL,private_key \
--certificate=db:Open_vSwitch,SSL,certificate \
--pidfile --detach --log-file
ovs-vsctl --no-wait init
ovs-vswitchd --pidfile --detach
ovs-vsctl show

If this does not work for you, please report me your issue . I will do my best to help you!

Regards,

4 Comments